ORCID Profile
0000-0002-9667-9526
Current Organisation
Macquarie University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Communications Technologies | Photonics, Optoelectronics and Optical Communications | Optical And Photonic Systems | Photonics and Electro-Optical Engineering (excl. Communications) | Optical Physics | Lasers and Quantum Electronics | Optics And Opto-Electronic Physics | Electrical and Electronic Engineering | Engineering/Technology Instrumentation | Nanotechnology | Microelectronics and Integrated Circuits | Photodetectors, Optical Sensors and Solar Cells | Lasers and quantum electronics | Composite and hybrid materials | Biophysics | Glass | Materials Engineering | Composite and Hybrid Materials | Optical fibre communication systems and technologies | Nonlinear Optics and Spectroscopy | Quantum Optics And Lasers | Modem Technology | Nanophotonics | Signal Processing | Communications engineering | Astronomy And Astrophysics | Optical Fibre Communications
ANZSRC Socio-Economic Objective (SEO)
Combined operations | Emerging Defence Technologies | Medical instrumentation | Scientific instrumentation | Medical Instruments | Telecommunications | Industrial Instruments | Skeletal System and Disorders (incl. Arthritis) | Network switching equipment | Chemical sciences | Physical sciences | Air transport | Ceramics, glass and industrial mineral products not elsewhere classified | Mobile Data Networks and Services | Industrial instrumentation | Manufacturing not elsewhere classified | Expanding Knowledge in Technology | Aerospace Transport not elsewhere classified | Environmentally Sustainable Information and Communication Services not elsewhere classified | Expanding Knowledge in the Physical Sciences | Scientific Instruments |
Related Links
Publications
A Mid-Infrared Mode-locked Fiber Laser for Frequency Combs
Publisher: OSA
Date: 2015
Energy transfer and energy level decay processes of Er3+ in water-free tellurite glass
Publisher: Elsevier BV
Date: 12-2015
Mid-infrared fiber sources for real-time biomedical sensing
Publisher: SPIE
Date: 04-03-2019
DOI: 10.1117/12.2507322
GaN laser diode pumped dysprosium doped ZBLAN fibre laser for yellow emission
Publisher: SPIE
Date: 30-12-2019
DOI: 10.1117/12.2539950
Erbium 3 μm fiber lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2001
DOI: 10.1109/2944.924006
Towards subdiffraction imaging with wire array metamaterial hyperlenses at MIR frequencies
Publisher: The Optical Society
Date: 16-07-2019
DOI: 10.1364/OE.27.021420
Passively Q-switched Tm^3+, Ho^3+-doped silica fiber laser using a highly nonlinear saturable absorber and dynamic gain pulse compression
Publisher: Optica Publishing Group
Date: 19-12-2008
DOI: 10.1364/OE.16.022058
Abstract: We demonstrate a compact core-pumped 2 microm Tm(3+), Ho(3+)- doped all-fiber laser passively Q-switched with an antimony-based saturable absorber. The 20 ns pulses are the shortest Q-switched pulses from a fiber laser operating beyond 1850 nm and were produced at a repetition rate of 57 kHz and pulse energy of 15 microJ using a short-length (4 ns) cavity. The large absorber modulation depth of approximately 70% together with transient gain compression is shown to provide an efficient mechanism for Q-switched pulse shortening.
Highly efficient first order Raman fibre lasers using very short Ge-doped silica fibres
Publisher: Elsevier BV
Date: 09-2005
Theoretical study and optimization of a high power mid-infrared erbium-doped ZBLAN fibre laser
Publisher: IOP Publishing
Date: 03-2011
The influence of skew rays on angular losses in air-clad fibres
Publisher: Elsevier BV
Date: 06-2006
An investigation into Raman mode locking of fiber lasers
Publisher: Optica Publishing Group
Date: 04-2008
DOI: 10.1364/OE.16.005277
Abstract: We present a detailed experimental and modeling study of fiber lasers passively mode locked using stimulated Raman scattering. We present experimental measurements of the mode locking behavior, and use the model to elucidate the nonlinear processes that create the intracavity pulses and determine the repetition rate and the order of fundamental and Raman pulses. We also present a simple method for harmonic mode locking Raman fiber lasers.
High power diode-pumped triply doped fibre laser
Publisher: Springer Science and Business Media LLC
Date: 02-2004
Versatile mid-infrared mode-locked fiber laser, electronically tunable from 2.97 to 3.30 µm
Publisher: OSA
Date: 2018
Actively Q-switched and mode-locked Tm^3+-doped silicate 2 μm fiber laser for supercontinuum generation in fluoride fiber
Publisher: The Optical Society
Date: 08-02-2012
DOI: 10.1364/OL.37.000512
Optimized design of high power mid-infrared Er<sup>3+</sup>, Pr<sup>3+</sup>-codoped ZBLAN fiber laser
Publisher: IEEE
Date: 2010
High power shortwave infrared fibre lasers that use silica host material
Publisher: SPIE
Date: 25-04-2008
DOI: 10.1117/12.783233
Stable, self-starting, passively mode-locked fiber ring laser of the 3 μm class
Publisher: The Optical Society
Date: 31-03-2014
DOI: 10.1364/OL.39.002133
Outcome measures for technique survival reported in peritoneal dialysis: A systematic review
Publisher: SAGE Publications
Date: 21-04-2021
Abstract: Peritoneal dialysis (PD) technique survival is an important outcome for patients, caregivers and health professionals, however, the definition and measures used for technique survival vary. We aimed to assess the scope and consistency of definitions and measures used for technique survival in studies of patients receiving PD. MEDLINE, EMBASE and CENTRAL databases were searched for randomised controlled studies (RCTs) conducted in patients receiving PD reporting technique survival as an outcome between database inception and December 2019. The definition and measures used were extracted and independently assessed by two reviewers. We included 25 RCTs with a total of 3645 participants (41–371 per trial) and follow up ranging from 6 weeks to 4 years. Terminology used included ‘technique survival’ (10 studies), ‘transfer to haemodialysis (HD)’ (8 studies) and ‘technique failure’ (7 studies) with 17 different definitions. In seven studies, it was unclear whether the definition included transfer to HD, death or transplantation and eight studies reported ‘transfer to HD’ without further definition regarding duration or other events. Of those remaining, five studies included death in their definition of a technique event, whereas death was censored in the other five. The duration of HD necessary to qualify as an event was reported in only four (16%) studies. Of the 14 studies reporting causes of an event, all used a different list of causes. There is substantial heterogeneity in how PD technique survival is defined and measured, likely contributing to considerable variability in reported rates. Standardised measures for reporting technique survival in PD studies are required to improve comparability.
High-pulse-energy, actively Q-switched Tm^3+,Ho^3+-codoped silica 2μm fiber laser
Publisher: Optica Publishing Group
Date: 08-05-2008
DOI: 10.1364/OL.33.001044
Abstract: A diode-pumped Q-switched Tm(3+),Ho(3+)-codoped double-clad silica fiber laser is reported providing average powers of up to 12.3 W at 2072.7 nm and stable pulse widths of only 45 ns and repetition rates in the range 10-100 kHz. Instabilities in pulse shape occur at nonoptimum cavity alignment and were found to be linked to the mechanism responsible for self mode locking.
High-power fiber lasers for the shortwave infrared
Publisher: SPIE
Date: 23-04-2010
DOI: 10.1117/12.852689
Passively Q-switched fiber laser that uses saturable Raman gain
Publisher: Optica Publishing Group
Date: 15-03-2006
DOI: 10.1364/OL.31.000751
Abstract: Operation of a short all-fiber passively Q-switched Raman laser pumped by a continuous-wave laser diode is experimentally demonstrated. The passively switched fiber laser consists simply of a double-clad ytterbium-doped silica fiber that is spliced directly to a moderately germanium-doped silica fiber. The placement of the Ge-doped silica fiber within the fundamental (Raman pump) cavity allows interplay between fundamental and Stokes fields to take place, which leads to saturation of the Raman gain as a result of pump depletion. Pulse widths of 70 and 60 ns at the first and second Stokes wavelengths of 1168 and 1232 nm, respectively, are produced at a stable 588 kHz repetition rate.
High-power and highly efficient Tm^3+-doped silica fiber lasers pumped with diode lasers operating at 1150 nm
Publisher: Optica Publishing Group
Date: 27-09-2007
DOI: 10.1364/OL.32.002873
Abstract: An output power of 1.74 W at 2.03 microm was generated at a slope efficiency of 51% when a double-clad Tm(3+)-doped silica fiber laser was pumped with high-power 1150 nm diode lasers. Pump excited state absorption from the upper laser level populates higher energy levels allowing cross relaxation to repopulate the upper laser level at a quantum efficiency greater than unity and to limit losses relating to additional pump excited state absorption. The output power was scaled to 4.77 W when both ends of the fiber were pumped.
85W Tm3+-doped 2μm fibre laser pumped at 793nm
Publisher: IEEE
Date: 2005
Yb3+-doped air-clad fibre laser using a Bragg grating written into active medium
Publisher: IEEE
Date: 2005
Improving the output performance from mid-infrared fibre lasers
Publisher: IEEE
Date: 2005
Direct evidence for laser reabsorption as initial cause for self-pulsing in three-level fibre lasers
Publisher: Institution of Engineering and Technology (IET)
Date: 2002
DOI: 10.1049/EL:20021148
Efficiency dependence on the Tm^3+ and Al^3+ concentrations for Tm^3+-doped silica double-clad fiber lasers
Publisher: Optica Publishing Group
Date: 20-05-2003
DOI: 10.1364/AO.42.002702
Abstract: We present measurements of the slope efficiency and the pump power at threshold for a number of Tm3+-doped silica double-clad fiber lasers that incorporate fibers that have a range of Tm3+ concentrations. We obtain a slope efficiency for the approximately 2-microm 3H4 --> 3H6 laser transition that is greater than the Stokes efficiency limit for a Tm3+ concentration as low as 1.3 wt. %. These results indicate that the cross relaxation process, 3F4, 3H6 --> 3H4, 3H4, has a significant effect on the efficiency of the laser despite the relatively short lifetime of the 3F4 energy level. Energy migration of the excitation at the 3F4 level through the process 3F4, 3H6 --> 3H6, 3F4 may be enhancing the cross-relaxation mechanism. We also show the importance of reducing the level of clustering of the Tm3+ ion when it is doped into silica by use of appropriate amounts of Al3+ codopant. For Tm3+ concentrations of >1 wt. %, Al3+/Tm3+ concentration ratios of > 10 are recommended forreducing scattering losses, quenching the lifetime, or both.
High-Power Broadly Tunable 3-<named-content content-type=math xlink:type=simple> <inline-formula> <tex-math notation=TeX>$\mu\hbox{m}$</tex-math></inline-formula>&l
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2015
Singly Ho3+-doped fluoride fibre laser operating at 2.92 [micro sign]m
Publisher: Institution of Engineering and Technology (IET)
Date: 2004
DOI: 10.1049/EL:20046463
Direct inscription of Bragg gratings into coated fluoride fibers for widely tunable and robust mid-infrared lasers
Publisher: The Optical Society
Date: 16-11-2017
DOI: 10.1364/OE.25.030013
Theoretical modeling of Tm-doped silica fiber lasers
Publisher: No publisher found
Date: 1999
DOI: 10.1109/50.762916
High power and highly efficient mid-infrared fiber lasers
Publisher: SPIE
Date: 08-02-2007
DOI: 10.1117/12.717617
Correction to erbium 3-/spl mu/m fiber lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2002
Swept-wavelength mid-infrared fiber laser for real-time ammonia gas sensing
Publisher: No publisher found
Date: 2019
DOI: 10.1063/1.5065415
Watt-level dysprosium fiber laser at 3.15 μm with 73% slope efficiency
Publisher: The Optical Society
Date: 20-03-2018
DOI: 10.1364/OL.43.001471
Recent progress in 3 micron class dysprosium-doped fluoride fiber lasers
Publisher: SPIE
Date: 22-02-2017
DOI: 10.1117/12.2251787
Simultaneous operation of a Raman fiber amplifier and laser pumped by a dual-wavelength Nd3+-doped fiber laser
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2005
Ultrafast pulses from a mid-infrared fiber laser
Publisher: The Optical Society
Date: 07-09-2015
DOI: 10.1364/OL.40.004226
High-power continuous wave mid-infrared fluoride glass fiber lasers
Publisher: Elsevier
Date: 2022
High-power mid-infrared femtosecond fiber laser in the water vapor transmission window
Publisher: The Optical Society
Date: 15-11-2016
Rapid decay of type-II femtosecond laser inscribed gratings within Q-switched Yb3+-doped fiber lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2010
Efficient gain-switched operation of a Tm-doped silica fiber laser
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-1998
DOI: 10.1109/3.668764
Metal-coated fluoride glass fiber
Publisher: Optica Publishing Group
Date: 27-06-2023
DOI: 10.1364/OME.493834
Abstract: We demonstrate a new design for active fluoride glass fibres in which a metal coating instead of a polymer coating is applied. A 2- μ m-thick silver layer is fabricated chemically to the periphery of the fiber, that in this case is doped with Dy 3+ ions, and coating lengths of up to 20 cm were produced. The temperature rise in the core of the fiber was accurately measured using a sensitive fiber Mach-Zenhder interferometer (MZI) employing a stabilised He-Ne laser. We use this setup to show that the metal coating can achieve a reduction in the fibre core temperature by up to 22% for low launched pump power levels. A basic two-dimensional model shows reasonable agreement with the experiment. This work paves the way for the development of active fluoride fiber applications in which reducing and stabilising the temperature of the fibre is critical.
210 mW 2.84 [micro sign]m Ho3+, Pr3+-doped fluoride fibre laser
Publisher: Institution of Engineering and Technology (IET)
Date: 2003
DOI: 10.1049/EL:20030533
Spectroscopy of the rare-earth-ion transitions in fluoride glasses
Publisher: Elsevier
Date: 2022
The functional impact of sleep deprivation, sleep restriction, and sleep fragmentation
Publisher: Springer New York
Date: 12-10-2014
The basic spectroscopic parameters of Ho 3+ -doped fluoroindate glass for emission at 3.9 μm
Publisher: Elsevier BV
Date: 10-2016
UV-induced Bragg grating inscription into single-polarization all-solid hybrid microstructured optical fiber
Publisher: The Optical Society
Date: 28-06-2011
DOI: 10.1364/OE.19.013525
High-power diode-pumped fiber laser operating at 3 μm
Publisher: The Optical Society
Date: 14-09-2011
DOI: 10.1364/OL.36.003642
Grating-free nth order cascaded Raman fibre lasers using highly Ge-doped low loss fibre
Publisher: Optica Publishing Group
Date: 2004
Abstract: Pumped by a narrow band Nd(3+)-doped fibre laser, a grating-free three-wavelength Raman fibre laser has been demonstrated. More than 1.3W output power at the third Stokes line of 1230 nm, a bandwidth of 1.8nm and a slope efficiency of ~28% was measured. A four-wavelength Raman fibre laser was also demonstrated using a different resonator that consisted of a 4% fibre end reflector, a dielectric mirror and a single fibre Bragg grating. This method is simple, versatile and cheap compared with conventional methods employing fibre Bragg gratings used to resonate all Stokes wavelengths.
Role of energy transfer in concentrated Dy3+-doped fibers
Publisher: Optica Publishing Group
Date: 10-2021
DOI: 10.1364/OSAC.435526
Abstract: Using high power quasi-cw pulse pumping, we show that energy transfer upconversion (ETU) processes in highly doped Dy 3+ double clad ZBLAN fibers creates a pathway for significant excitation loss that cl s the gain. For a 4 mol.% Dy 3+ -doped fiber, we establish that the pump absorption is non-saturable up to a maximum launched (peak) pump power of 100 W. We propose that this arises from a co-operative three-ion ETU process. Additionally, the high power pulsed pumping of Tm 3+ , Dy 3+ -co-doped fiber produces laser relaxation spikes that appear after the pump pulse, suggesting that ETU dominates all other process during pumping.
Near infrared pumped full gain bandwidth tunable 3 micron dysprosium fiber laser
Publisher: SPIE
Date: 26-02-2018
DOI: 10.1117/12.2289382
Raman oscillation with intracavity pumping of a fibre laser
Publisher: Elsevier BV
Date: 04-2001
Diode-pumped mid-infrared fiber laser with 50% slope efficiency
Publisher: The Optical Society
Date: 13-02-2017
Midinfrared supercontinuum generation from 2 to 6 μm in a silicon nanowire
Publisher: The Optical Society
Date: 04-09-2015
Directly diode-pumped mid-infrared dysprosium fiber laser
Publisher: The Optical Society
Date: 11-11-2019
DOI: 10.1364/OL.44.005549
Recent Advances in 3.5 μm Erbium-Doped Mid-Infrared Fiber Lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2017
High power tunable femtosecond pulse source based on amplification in Tm fiber
Publisher: IEEE
Date: 2005
In-fiber polarizer based on a 45-degree tilted fluoride fiber Bragg grating for mid-infrared fiber laser technology
Publisher: The Optical Society
Date: 12-09-2018
Theoretical characterization of Raman oscillation with intracavity pumping of fiber lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2001
DOI: 10.1109/3.918574
A highly-efficient, 2.9 μm Q-switched Ho/Pr co-doped fiber laser
Publisher: OSA
Date: 2012
High-pulse-energy actively Q-switched Tm^3+-doped silica 2 μm fiber laser pumped at 792 nm
Publisher: Optica Publishing Group
Date: 18-09-2007
DOI: 10.1364/OL.32.002780
Abstract: A diode-pumped Q-switched Tm(3+)-doped double-clad silica fiber laser is reported providing average powers of up to 30 W at pulse widths of only 41 ns and repetition rates in the range of 10-125 kHz. Up to 270 microJ pulse energy was produced. Amplified spontaneous emission (ASE) buildup limits the maximum peak power, and the pump power and average output power at the point of ASE induced cl ing were found to depend linearly on the repetition rate.
Cross relaxation and energy transfer upconversion processes relevant to the functioning of 2 μm Tm3+-doped silica fibre lasers
Publisher: Elsevier BV
Date: 2004
High-power 83W holmium-doped silica fiber laser operating with high beam quality
Publisher: The Optical Society
Date: 12-01-2007
DOI: 10.1364/OL.32.000241
Abstract: A high-power 83 W cladding-pumped Tm3+-Ho3+-doped silica fiber laser is reported. Using bidirectional 793 nm diode pumping, a maximum slope efficiency of 42% was produced after a threshold launched pump power of 12 W was exceeded. The laser operated at wavelengths near 2105 nm with moderate beam quality, i.e., M2 approximately 1.5. Further power scaling of the fiber laser was limited by thermal failure of the fiber ends.
Ultrafast 3.5 µm fiber laser
Publisher: Optica Publishing Group
Date: 23-03-2021
DOI: 10.1364/OL.418162
Abstract: We report, to the best of our knowledge, the first mode-locked fiber laser to operate in the femtosecond regime well beyond 3 µm. The laser uses dual-wavelength pumping and nonlinear polarization rotation to produce 3.5 µm wavelength pulses with minimum duration of 580 fs at a repetition rate of 68 MHz. The pulse energy is 3.2 nJ, corresponding to a peak power of 5.5 kW.
Aim at the bottom: directly exciting the lower level of a laser transition for additional functionality
Publisher: The Optical Society
Date: 20-02-2014
DOI: 10.1364/OL.39.001153
Theoretical comparison of Er3+-doped crystal lasers
Publisher: Informa UK Limited
Date: 06-1998
Long period gratings for wavelength specific loss in a fibre laser
Publisher: IEEE
Date: 06-2007
High-power and highly efficient diode-cladding-pumped holmium-doped fluoride fiber laser operating at 294 μm
Publisher: Optica Publishing Group
Date: 24-07-2009
DOI: 10.1364/OL.34.002327
Abstract: A high-power diode-cladding-pumped Ho(3+), Pr(3+)-doped fluoride glass fiber laser is demonstrated. The laser produced a maximum output power of 2.5 W at a slope efficiency of 32% using diode lasers emitting at 1,150 nm. The long-emission wavelength of 2.94 microm measured at maximum pump power, which is particularly suited to medical applications, indicates that tailoring of the proportion of Pr(3+) ions can provide specific emission wavelengths while providing sufficient de-excitation of the lower laser level.
Modelling of high-power diode-pumped erbium 3 μm fibre lasers
Publisher: Informa UK Limited
Date: 09-2000
Diode-cladding-pumped Yb^3+, Ho^3+-doped silica fiber laser operating at 21-μm
Publisher: Optica Publishing Group
Date: 20-06-2003
DOI: 10.1364/AO.42.003546
Abstract: The characteristics of the performance of a diode-cladding-pumped Yb3+, Ho(3+)-doped silica fiber laser are presented. To our knowledge this in the first demonstration of a Yb3+, Ho(3+)-doped fiber laser, and a maximum output power of 0.85 W was achieved for a launched pump power of 10.9 W. For launched pump powers < 7 W, the slope efficiency was approximately 12.5%. Visible fluorescence emission with peaks at approximately 485, approximately 550, and approximately 660 nm measured at the output from the laser suggests that excited-state absorption and energy-transfer upconversion losses may impair the functioning of the laser. Increasing the Yb3+ and Ho3+ concentrations and the Yb3+:Ho3+ concentration ratio may lead to an improvement in the overall efficiency of the device.
Discrete wavelength generation using modal interference in a diode-laser-pumped Tm3+-doped few-mode fibre
Publisher: Elsevier BV
Date: 02-2008
Gain-switched holmium-doped fibre laser
Publisher: The Optical Society
Date: 30-10-2009
DOI: 10.1364/OE.17.020872
Theoretical modeling of a diode-pumped Nd:YAG laser with a solid nonfocusing pump light collector
Publisher: Optica Publishing Group
Date: 20-04-1994
DOI: 10.1364/AO.33.002273
Mode-locked dysprosium fiber laser
Publisher: AIP Publishing
Date: 11-2018
DOI: 10.1063/1.5045799
Abstract: Mode-locked fiber laser technology to date has been limited to sub-3 μm wavelengths despite significant application-driven demand for compact picosecond and femtosecond pulse sources at longer wavelengths. Erbium-doped and holmium-doped fluoride fiber lasers incorporating a saturable absorber are emerging as promising pulse sources for 2.7–2.9 μm, yet it remains a major challenge to extend this coverage. Here, we propose a new approach using a dysprosium-doped fiber with frequency shifted feedback (FSF). Using a simple linear cavity with an acousto-optic tunable filter, we generate ∼33 ps pulses with up to 2.7 nJ energy and 330 nm tunability from 2.97 to 3.30 μm (∼3000–3400 cm−1)—the first mode-locked fiber laser to cover this spectral region and the most broadly tunable pulsed fiber laser to date. Numerical simulations show excellent agreement with experiments and also offer new insights into the underlying dynamics of FSF pulse generation. This highlights the remarkable potential of both dysprosium as a gain material and FSF for versatile pulse generation, opening new opportunities for mid-IR laser development and practical applications outside the laboratory.
Mid-IR supercontinuum generation
Publisher: OSA
Date: 2018
Generation of 70-fs pulses at 2.86 μm from a mid-infrared fiber laser
Publisher: The Optical Society
Date: 22-11-2017
DOI: 10.1364/OL.42.004893
Holmium, praseodymium-doped fluoride fiber laser operating near 2.87 /spl mu/m and pumped with a Nd:YAG laser
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2005
Dysprosium Mid‐Infrared Lasers: Current Status and Future Prospects
Publisher: Wiley
Date: 05-02-2020
CW operation of a 1.064-μm pumped Tm-Ho-doped silica fiber laser
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 1998
DOI: 10.1109/3.709574
Efficient Tm3+, Ho3+-co-doped silica fibre laser diode pumped at 1150nm
Publisher: Elsevier BV
Date: 07-2008
Octave spanning supercontinuum in an As2S3 taper using ultralow pump pulse energy
Publisher: The Optical Society
Date: 22-03-2011
DOI: 10.1364/OL.36.001122
Towards diode-pumped mid-infrared praseodymium-ytterbium-doped fluoride fiber lasers
Publisher: SPIE
Date: 26-02-2018
DOI: 10.1117/12.2294508
Pump excited state absorption in holmium-doped fluoride glass
Publisher: AIP Publishing
Date: 15-01-2008
DOI: 10.1063/1.2833436
Abstract: The primary excited state absorption processes relating to the I65→I75 3μm laser transition in singly Ho3+-doped fluoride glass have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the I65 and I75 energy levels established the occurrence of two excited state absorption transitions from these energy levels that compete with previously described energy transfer upconversion processes. The I75→I45 excited state absorption transition has peak cross sections at 1216nm (σesa=2.8×10−21cm2), 1174nm (σesa=1×10−21cm2), and 1134nm (σesa=7.4×10−22cm2) which have a strong overlap with the I85→I65 ground state absorption. On the other hand, it was established that the excited state absorption transition I65→S25 had a weak overlap with ground state absorption. Using numerical solution of the rate equations, we show that Ho3+-doped fluoride fiber lasers employing pumping at 1100nm rely on excited state absorption from the lowest excited state of Ho3+ to maintain a population inversion and that energy transfer upconversion processes compete detrimentally with the excited state absorption processes in concentrated Ho3+-doped fluoride glass.
Novel near-infrared pump wavelengths for dysprosium fiber lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-10-2020
Making lower energy photons from fiber lasers
Publisher: OSA
Date: 2012
Low propagation loss silicon-on-sapphire nanowires for the mid-IR
Publisher: IEEE
Date: 08-2011
Generating picosecond pulses from mid-infrared fiber lasers using frequency-shifted feedback
Publisher: IEEE
Date: 06-2019
High energy pulses from a wavelength tunable Dy:ZBLAN mid-infrared fiber laser
Publisher: IEEE
Date: 06-2019
Octave spanning supercontinuum in an As 2 S 3 taper using ultra-low pump pulse energy: Theory and experiment
Publisher: IEEE
Date: 08-2011
Investigation of a 791-nm pulsed-pumped 2.7-μm Er-doped ZBLAN fibre laser
Publisher: Elsevier BV
Date: 05-2001
Diode-pumped tunable Ho<sup>3+</sup>, Pr<sup>3+</sup>-doped fluoride glass double clad fibre laser
Publisher: IEEE
Date: 08-2011
Diode pumped dysprosium fiber laser
Publisher: SPIE
Date: 21-02-2020
DOI: 10.1117/12.2545474
3.4 W Ho3+, Pr3+ co-doped fluoride fibre laser
Publisher: No publisher found
Date: 2014
CMOS compatible chips for applications in nonlinear optics
Publisher: SPIE
Date: 11-10-2013
DOI: 10.1117/12.2035405
High absorption and low splice loss properties of hexagonal double-clad fiber
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2004
Superluminescent Fiber Laser Source in the Mid-Infrared via Dual-Pumping
Publisher: OSA
Date: 2014
High power 2 mu m Tm3+-doped fibre lasers
Publisher: SPIE
Date: 23-12-2004
DOI: 10.1117/12.580042
Efficient 2.96 micron dysprosium-doped ZBLAN fibre laser pumped at 1.3 micron
Publisher: SPIE
Date: 21-04-2006
DOI: 10.1117/12.666892
Diode-pumped fiber lasers: A new clinical tool?
Publisher: Wiley
Date: 03-2002
DOI: 10.1002/LSM.10023
Abstract: Diode-pumped fiber lasers are a compact and an efficient source of high power laser radiation. These laser systems have found wide recognition in the area of lasers as a result of these very practical characteristics and are now becoming important tools for a large number of applications. In this review, we outline the basic physics of fiber lasers and illustrate how a number of clinical procedures would benefit from their employment. The pump mechanisms, the relevant pump and laser transitions between the energy levels, and the main properties of the output from fiber lasers will be briefly reviewed. The main types of high power fiber lasers that have been demonstrated will be examined along with some recent medical applications that have used these lasers. We will also provide a general review of some important medical specialties, highlighting why these fields would gain from the introduction of the fiber laser. It is established that while the fiber laser is still a new form of laser device and hence not commercially available in a wide sense, a number of important medical procedures will benefit from its general introduction into medicine. With the number of medical and surgical applications requiring high power laser radiation steadily increasing, the demand for more efficient and compact laser systems providing this capacity will grow commensurately. The high power fiber laser is one system that looks like a promising modality to meet this need.
Mid-infrared passively mode-locked fiber ring laser
Publisher: OSA
Date: 2014
Scattering under the Rayleigh–Debye–Gans condition for transparent glass ceramics
Publisher: Optica Publishing Group
Date: 22-05-2023
DOI: 10.1364/AO.493018
Abstract: We reviewed the various theoretical relations that quantify light scattering under the Rayleigh–Debye–Gans (RDG) approximation and applied these relations to calculate scattering within transparent glass ceramics (TGCs) composed of large nanocrystals within a glass matrix. For a more realistic picture of scattering, we included material dispersion of the crystals and glasses across the transparency range of these materials by way of the Sellmeier equation. We first selected a number of crystal–glass sets that are near-index-matched in the visible and near-IR to fulfill one of the RDG criterion. We found that the various forms of scattering under the RDG approximation differ significantly across the visible and near-IR. We also found that the inclusion of material dispersion significantly changes the trends in the calculated scattering cross section across the studied wavelength range. Overall, we found that calculation of the scattering cross section is highly dependent on the chosen theoretical relation and that the inclusion of material dispersion is vital to better understand scattering loss in this new class of optical materials.
In-fiber resonantly pumped Q-switched holmium fiber laser
Publisher: Optica Publishing Group
Date: 29-10-2009
DOI: 10.1364/OL.34.003412
Holmium doped silica fibre lasers
Publisher: IEEE
Date: 07-2008
Multiple-watt Tm3+, Ho3+-co-doped silica fibre laser tunable across both dopant transitions
Publisher: IEEE
Date: 07-2008
Raman oscillation on a new vibrational mode setup in phosphosilicate binary glass systems
Publisher: Optica Publishing Group
Date: 2005
Abstract: We demonstrate Raman oscillation at a wavelength of 1158 nm using a new vibrational mode in a phosphosilicate-glass system when pumped at a 1060-nm wavelength. The lower energy P-O vibration located at 640 cm-1 associated with pure phosphate glass system is comparatively weaker and is shifted to higher energy at 800 cm-1 in the phosphosilicate binary glass. Despite the relative weakness of this vibrational mode, we obtained an efficient Raman fiber laser with the use of fiber Bragg gratings used to select laser oscillation using this mode. The measured slope efficiency with respect to the launched pump power was 60.4% and a maximum laser power of 1.8 W was produced.
Diode-cladding-pumped singly Ho3+-doped silica fibre laser
Publisher: Institution of Engineering and Technology (IET)
Date: 2007
DOI: 10.1049/EL:20071750
Q-switched and Mode-locked 3.5 μm Fiber Laser
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C3A_3
Abstract: We report on a tunable mid-infrared erbium fiber laser mode-locked via frequency shifted-feedback provided by an acousto-optic tunable filter. Q-switched pulses were produced when the driving frequency of the acousto-optic tunable filter was square-wave modulated.
Thermally induced strain and birefringence calculations for a ND: YAG rod encapsulated in a solid pump light collector
Publisher: Optica Publishing Group
Date: 20-03-1996
DOI: 10.1364/AO.35.001409
All-fibre Ultrafast Mid-infrared Laser
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C3A_2
Abstract: We report the first wavelength stabilized all-fibre ultrafast mid-infrared laser using MXene as a novel saturable absorber. This all-integrated pulsed laser is a promising tool for a broad range of applications in the mid-infrared regime.
Near-infrared pump wavelengths for high efficiency dysprosium doped mid-infrared fibre lasers
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C3A_1
Abstract: We report two excited-state absorption free near-infrared pump wavelengths (0.8 and 0.9 μm) for dysprosium-doped mid-infrared fibre lasers. High power diodes are available at these wavelengths, which opens up the opportunity for a diode-pumped system.
Chalcogenide glass Raman fiber laser
Publisher: AIP Publishing
Date: 29-05-2006
DOI: 10.1063/1.2208369
Abstract: We report the operation of a chalcogenide glass Raman fiber laser. To mitigate photoinduced effects and minimize impurity absorption, a 2051nm Tm3+-doped silica fiber laser was employed as the pump source. Vibrations between the polymerlike layers comprising the glass produced first Stokes emission at 2062nm, an output power of 0.64W, and a slope efficiency of ∼66%. Bond bending and bond stretching vibrations within the layers simultaneously produced first Stokes output at 2102nm (0.2W) and 2166nm (16mW), respectively. Second Stokes output at 2074nm was produced when the fiber length was extended.
Mode-Locked and Tunable 3.5 $\mu$m Fiber Laser Using an Acousto-Optic Modulator
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-01-2023
Mode-locked and tunable fiber laser at the 3.5 µm band using frequency-shifted feedback
Publisher: Optica Publishing Group
Date: 24-12-2019
DOI: 10.1364/OL.45.000224
Abstract: We report on a mid-infrared mode-locked fiber laser that uses an acousto-optic tunable filter to achieve frequency-shifted feedback pulse generation with frequency tuning over a 215 nm range. The laser operates on the 3.5 µm transition in erbium-doped zirconium fluoride-based fiber and utilizes the dual-wavelength pumping scheme. Stable, self-starting mode locking with a minimum pulse duration of 53 ps was measured using a two-photon absorption autocorrelator. The longest wavelength demonstrated was 3612 nm, and the maximum average powers achieved were 50 and 167 mW in fundamental and multi-pulse mode-locking regimes, respectively. To the best of our knowledge, this is the longest wavelength rare-earth-doped mode-locked fiber laser demonstrated. The broad tunability promises potential uses for environmental sensing applications.
Determination of bacterial species present in biofilm contaminating the channels of clinical endoscopes
Publisher: Elsevier BV
Date: 12-2018
Waveguides for Nonlinear Optics in the Mid-Infrared
Publisher: OSA
Date: 2017
Microstructured polymer fiber laser
Publisher: Optica Publishing Group
Date: 13-08-2004
DOI: 10.1364/OL.29.001882
Abstract: A microstructured polymer optical fiber doped with Rhodamine 6G dye was fabricated and demonstrated as an optical lifier and a fiber laser. As an lifier, the fiber achieved a gain in excess of 30 dB. As a pulsed fiber laser, the fiber exhibited a threshold of 20 microJ, a slope efficiency of 18%, and a lifetime as high as 130,000 shots at 10 Hz. The maximum output energy was 16 microJ. The advantages that such fibers offer lie in the simplicity and flexibility of their fabrication and in their potential for use as compact, tunable solid-state sources.
Polarization effects and fiber-laser-pumping of a 2-µm-pumped OP-GaAs OPO
Publisher: SPIE
Date: 11-02-2010
DOI: 10.1117/12.846917
A method for concise reporting of joint reaction forces orientation during gait
Publisher: Elsevier BV
Date: 10-2016
DOI: 10.1016/J.JBIOMECH.2016.08.005
Abstract: Estimation of joint reaction forces (JRF) is critical for the understanding of load-related pathologies, such as osteoarthritis (OA). Typically, singular components at discrete time-points are presented without knowledge of their orientation over time. The aim of this study was to develop and demonstrate the utility of a method for the concise and intuitive representation of JRF orientation. A scaled musculoskeletal model of the lower limbs was informed by walking gait data from adults with knee OA (n=10) and healthy controls (C) (n=10). Muscle forces and subsequently JRF were computed. The intersections of the JRF vector and a transverse plane proximal to the joint were computed. The 95% confidence ellipse was computed for these points. This allowed the following metrics to be calculated: the normalised area of the ellipse (A) the ratio of the long and short axes (R) the angle between the long axis of the ellipse and the anterior-posterior axis of the distal segment (α) and the position of the centre of the ellipse relative to the origin of the segment (X
Recent proaress in the development of TM/sup 3+/-doped silica fibre lasers
Publisher: IEEE
Date: 2003
10 kHz linewidth distributed feedback photonic crystal fibre (DFB-PCF) laser
Publisher: SPIE
Date: 14-04-2008
DOI: 10.1117/12.785958
Numerical design of 4μm-class dysprosium fluoride fiber lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2021
Erratum
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2006
Emission beyond 4 μm and mid-infrared lasing from a Dy3+:InF3 fiber
Publisher: OSA
Date: 2018
FM-mode-locked fiber laser operating at 2.9 μm
Publisher: IEEE
Date: 06-2013
Few-cycle pulse generation from a 3 μm fiber laser
Publisher: OSA
Date: 2018
High power, narrow bandwidth and broadly tunable Tm3+, Ho 3+-co-doped aluminosilicate glass fibre laser
Publisher: Institution of Engineering and Technology (IET)
Date: 2010
DOI: 10.1049/EL.2010.2809
Energy recycling versus lifetime quenching in erbium-doped 3-μm fiber lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2002
DOI: 10.1109/3.980268
<title>Development and application of fiber lasers for medical applications</title>
Publisher: SPIE
Date: 04-06-2001
DOI: 10.1117/12.427916
Cooperative luminescence and absorption in ytterbium doped aluminosilicate glass optical fibres and preforms
Publisher: Elsevier BV
Date: 05-2007
Electronically tunable picosecond pulse generation from Ho3+-doped fluoride fiber laser using frequency-shifted feedback
Publisher: Optica Publishing Group
Date: 13-10-2020
DOI: 10.1364/OL.408609
Abstract: In this Letter, we demonstrate electronically tunable picosecond (ps) pulse emission from the 5 I 6 − 5 I 7 transition of the H o 3 + ion by using an acousto-optic tunable filter. The holmium- and praseodymium-codoped ZBLAN fiber laser produced sub-50 ps pulses over a 100 nm tuning range, critically reaching a longest wavelength of 2.94 µm, which overlaps with the peak absorption of liquid water. Measured pulse energies of 8.1 nJ well exceed those expected from picosecond solitonic operation, suggesting possible application in ablative medicine. Furthermore, we present harmonically mode-locked operation of the oscillator, which indicates the possibility of expanding the capabilities of mid-infrared frequency shifted-feedback lasers through the ability to achieve higher pulse repetition rates.
Medium power double-clad Yb3+-doped silica fibre laser pumped efficiently by unfocused diode laser
Publisher: IEEE
Date: 06-2007
The effects of energy transfer upconversion on the performance of Tm/sup 3+/, Ho/sup 3+/-doped silica fiber lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2006
Single-frequency fiber laser operating at 29 μm
Publisher: The Optical Society
Date: 03-07-2013
DOI: 10.1364/OL.38.002388
Low propagation loss silicon-on-sapphire integrated waveguides for the mid-infrared
Publisher: OSA
Date: 2011
Octave spanning mid-IR supercontinuum generation in a silicon-on-sapphire waveguide
Publisher: OSA
Date: 2014
The Breakthroughs and Challenges in Mid-infrared Fibre Source Development
Publisher: OSA
Date: 2018
Electronically tunable mid-infrared mode-locked dysprosium fiber laser with over 330nm tunability
Publisher: SPIE
Date: 07-03-2019
DOI: 10.1117/12.2507093
Efficient in-band pumped Dy: ZBLAN mid-infrared fiber laser
Publisher: OSA
Date: 2016
Birefringent all-solid hybrid microstructured fiber
Publisher: Optica Publishing Group
Date: 29-10-2008
DOI: 10.1364/OE.16.018752
Abstract: We report the characterization of a birefringent all-solid hybrid microstructured fiber, in which the core-modes are guided by both the photonic bandgap (PBG) effect and total internal reflection (TIR). Due to the twofold symmetry, modal birefringence of 1.5 x 10(-4) and group birefringence of 2.1 x 10(-4) were measured at 1.31 microm, which is in the middle of the second bandgap. The band structure was calculated to be different from conventional 2-D PBG fibers due to the 1-D arrangement of high-index regions. The bend loss has a strong directional dependence due to the coexistence of the two guiding mechanisms. The fiber has two important properties pertinent to PBG fibers spectral filtering, and chromatic dispersion specific to PBG fibers. The number of high-index regions, which trap pump power (by index guiding) when the fiber is used in cladding-pumped fiber lasers, is greatly reduced so that this fiber should enable efficient cladding pumping. This structure is suitable for linearly-polarized, cladding-pumped fiber lasers utilizing the properties of PBG fibers.
Excited state absorption and energy transfer in Ho3+-doped indium fluoride glass
Publisher: No publisher found
Date: 2017
Rayleigh scattering with material dispersion for low volume fraction transparent glass ceramics
Publisher: Optica Publishing Group
Date: 14-06-2022
DOI: 10.1364/OME.457319
Abstract: In this report we review the literature concerning the theory of scattering in transparent glass ceramics (TGCs). The parameters dictating scattering are all relational and include the size of the scatterers relative to the wavelength of propagating light, the volume fraction of crystals relative to the vitreous matrix and the refractive index difference between crystal and glass. We extend the theory by including material dispersion for the case of low, i.e., % volume fraction of nanocrystals relative to the vitreous matrix where Rayleigh scattering is appropriate. We examine five crystal-glass sets and calculate the scattering coefficient from the visible to the mid-infrared. We show that for all combinations, the scattering coefficient departs from the fixed refractive index case by as much as 48% at 2.5 µ m for BaF 2 nanocrystals in an aluminosilictate glass. For every case studied, the addition of material dispersion reduces the dependence on wavelength from the standard λ −p where p = 4 to as much as p = 4.8 for the case of PbF 2 nanocrystals in an aluminosilictate glass. For the accurate estimation of the Rayleigh scattering coefficient in a TGC, knowledge of material dispersion is therefore essential.
High-power broadly tunable Ho3+-doped silica fibre laser
Publisher: Institution of Engineering and Technology (IET)
Date: 2004
DOI: 10.1049/EL:20046979
Efficient thermal management for passively cooled high power diode-pumped Nd:YAG lasers
Publisher: IEEE
Date: 1994
Ultrafast mid-infrared fiber laser mode-locked using frequency-shifted feedback
Publisher: The Optical Society
Date: 25-03-2019
DOI: 10.1364/OL.44.001698
Diode-pumped Ho<sup>3+</sup>, Pr<sup>3+</sup>-doped fluoride glass double clad fibre laser tuneable from 2.825 μm to 2.90 μm
Publisher: IEEE
Date: 07-2011
Narrow linewidth, 100 W cw Yb3+-doped silica fiber laser with a point-by-point Bragg grating inscribed directly into the active core
Publisher: Optica Publishing Group
Date: 07-04-2008
DOI: 10.1364/OL.32.002804
Abstract: We report on the power scaling to 103 W of a 1.1 microm continuous-wave Yb(3+)-doped silica fiber laser incorporating a point-by-point (PbP) fiber-Bragg grating inscribed directly into the active core using 800 nm femtosecond laser pulses. The spectrum of the laser exhibited a narrow linewidth that broadened to 260 pm at 103 W. The output was frequency doubled using an 11 mm long periodically poled MgO:LiNbO3 crystal to generate 2.1 W of green with an internal conversion efficiency of 10% at high power and 0.81%/W at low power.
Efficient 2.96 µm dysprosium-doped fluoride fibre laser pumped with a Nd:YAG laser operating at 1.3 µm
Publisher: Optica Publishing Group
Date: 2006
Abstract: A quasi-continuous wave Dy(3+)-doped ZBLAN fibre laser pumped by a ~1.3 microm Nd:YAG laser and operating at 2.96 microm with an emission linewidth of ~14 nm (FWHM) has been demonstrated. The (6)H(15/2) ? (6)H(9/2), (6)F(11/2) absorption band of Dy(3+)-doped ZBLAN centred at 1.3 microm has been used to pump the (6)H(13/2) ? (6)H(15/2) laser transition. For a 60 cm fibre length, a threshold of 0.5 W and a slope efficiency of ~20% with respect to the absorbed pump power was measured. The experimental slope efficiency was ~45% of the Stokes efficiency limit. The high efficiency relates to low pump ESA losses and an optimised output coupling as compared with previous demonstrations.
In fiber resonant pumping of a fiber laser
Publisher: SPIE
Date: 12-02-2021
DOI: 10.1117/12.813921
Mid-Infrared Fiber Photonics
Publisher: Elsevier
Date: 2022
Long wavelength operation of a dysprosium fiber laser for polymer processing
Publisher: Optica Publishing Group
Date: 25-01-2021
DOI: 10.1364/OL.417208
Abstract: We demonstrate operation of a mid-infrared dysprosium-doped fiber laser with emission at 3388 nm, representing the longest wavelength yet achieved from this class of laser, to the best of our knowledge. Oscillation far removed from the D y 3 + gain peak around 3 µm is achieved through the design of a high feedback optical cavity employing a directly inscribed fiber Bragg grating as the output coupler. Laser performance is characterized by a slope efficiency with respect to injected pump power of 38% and maximum output power of 134 mW, an improvement of at least three orders of magnitude over prior attempts at long wavelength D y 3 + fiber laser operation. This wavelength coincides with a maximum in the absorption coefficient of PMMA, which we exploit for preliminary demonstration of the utility of this source in polymer processing.
Drawing micro learning into MOOC: Using fragmented pieces of time to enable effective entire course learning experiences
Publisher: IEEE
Date: 05-2015
Q-switched induced gain switching of a two-transition cascade laser
Publisher: The Optical Society
Date: 25-05-2012
DOI: 10.1364/OE.20.013123
Reply to comment on “Microstructured polymer fiber laser”
Publisher: Optica Publishing Group
Date: 15-07-2005
DOI: 10.1364/OL.30.001829
A tunable Q-switched Ho3+-doped fluoride fiber laser
Publisher: IOP Publishing
Date: 27-02-2013
High-Power and Ultra-Efficient Operation of a Tm3+-doped Silica Fiber Laser
Publisher: OSA
Date: 2005
Highly efficient holmium fibre laser diode pumped at 1.94 [micro sign]m
Publisher: Institution of Engineering and Technology (IET)
Date: 2011
DOI: 10.1049/EL.2011.2426
Picosecond pulse formation in the presence of atmospheric absorption
Publisher: Optica Publishing Group
Date: 04-06-2021
DOI: 10.1364/OE.426564
Abstract: Mode-locked mid-infrared (MIR) fiber laser research has been dominated by the generation of pulses in the picosecond regime using saturable absorbers (SAs) and more recently frequency shifted feedback (FSF). Despite the significant emphasis placed on the development of materials to serve as the SAs for the MIR, published pulse durations have been substantially longer than what has been reported in the near-infrared (NIR). In this report we present experimental data supporting the view that the majority of demonstrations involving SAs and FSF have been limited by the presence of molecular gas absorption in the free-space sections of their cavities. We show that the pulse duration is directly linked to the width of an absorption-free region of the gaseous absorption profile and that the resulting optical spectrum is nearly always bounded by strong absorption features.
Recent developments in high-power mid-infrared fibre lasers
Publisher: IEEE
Date: 2003
Numerical Modeling and Optimization of Diode Pumped Heavily-Erbium-Doped Fluoride Fiber Lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2012
2.8 μm Er:YLF laser transversely pumped with a CW diode laser bar
Publisher: Elsevier BV
Date: 08-1999
Immediate, uninterrupted skin-to-skin contact and breastfeeding after birth: A cross-sectional electronic survey
Publisher: Elsevier BV
Date: 12-2019
DOI: 10.1016/J.MIDW.2019.102535
Abstract: To determine the incidence of immediate, uninterrupted skin-to-skin contact and breastfeeding after birth and which factors are associated with it. Cross-sectional e-survey was developed and piloted prior to distribution. S ling was purposive and included snowball s ling. Associations between maternity care practices and the primary outcome measure were examined using logistic regression. Australia. Women who birthed a term baby within the previous three years, in any Australian setting (hospital, birth centre or at home), were eligible to participate. 1200 postpartum women met the eligibility criteria and completed the e-survey. The primary outcome, 'pronurturance', included: (1) immediate mother/baby holding (2) skin-to-skin contact (3) uninterrupted holding for at least 60 min 4) breastfeeding in the birth setting. Of 1200 participants, 22% (n = 258) experienced pronurturance. Pronurturance was less likely following caesarean section (adjusted Odds Ratio (aOR) 0.07, 95% Confidence Interval (CI) 0.03-0.17). Pronurturance was more likely with a known midwife during labour and birth (aOR 1.89, 95% CI 1.35-2.65). Contributing to the low rate of pronurturance were lack of antenatal skin-to-skin information babies being wrapped women wearing clothing and non-urgent caregiver interruptions including weighing the baby or facilitating the mother to shower. Health services must strategically address the institutional processes which delay and/or interrupt skin-to-skin contact and breastfeeding in birth suite and operating theatre settings. Midwives and midwifery students providing continuity of carer are best placed to provide pronurturance to mothers and babies. Caregivers should educate women about pronurturance antenatally, and actively support immediate, uninterrupted mother/baby skin-to-skin contact and breastfeeding after birth.
High power fibre lasers based on point-by-point inscribed fibre-Bragg gratings
Publisher: IEEE
Date: 06-2007
Photo-erasure of type-II femtosecond laser written Bragg gratings employed as high reflectors in moderate power Q-switch fibre laser
Publisher: SPIE
Date: 07-05-2009
DOI: 10.1117/12.820586
Narrow-linewidth, Yb3+-doped, hybrid microstructured fibre laser operating at 1178 nm
Publisher: Institution of Engineering and Technology (IET)
Date: 2009
DOI: 10.1049/EL.2009.1734
Laser-tissue interaction with a continuous wave 3-?m fibre laser: Preliminary studies with soft tissue
Publisher: Wiley
Date: 2000
DOI: 10.1002/1096-9101(2000)26:5<491::AID-LSM9>3.0.CO;2-E
Abstract: Lasers operating at wavelengths in the mid-infrared region have become increasingly popular for applications in areas of surgery and medicine. Advances in fibre laser technology have introduced a highly efficient, compact, diode-pumped source operating at around the 3-mcm wavelength. This study examines the effects of this recently developed laser on soft biological tissue. Chicken breast and liver tissue s les were exposed to 800 mW continuous wave laser power, at a wavelength of 2.71 mcm, with incident spot sizes of around 150 mcm. S les were inspected grossly immediately after laser irradiation and also prepared for histologic processing. After irradiation, visual assessment of changes at s le surfaces indicated a region of thermally affected tissue surrounding the ablation crater. This region was observed to grow in size to around 1.0 mm in diameter after 3 seconds of laser exposure at 800 mW. An ablation velocity of 0.80 mm.s(-1) was determined in chicken breast for the same incident laser parameters. Analysis of s les irradiated at 800 mW and processed for histology revealed minimal damage at hole boundaries and no signs of char formation, providing incident exposure times were restricted to below around 0. 5 seconds. This fibre laser source has demonstrated its potential to fulfil medical applications, enabling accurate, precise tissue removal to proceed at a rapid ablation rate. The efficiency and small size of the laser are attractive features.
Directly diode-pumped holmium fiber lasers
Publisher: Optica Publishing Group
Date: 16-08-2007
DOI: 10.1364/OL.32.002496
Abstract: Sensitizer-free holmium-doped silica and fluoride mid-infrared fiber lasers are pumped using a high-power diode laser operating at 1148 nm. A maximum output power of 162 mW at 2.86 microm was produced at a slope efficiency of 24% using Ho(3+), Pr(3+)-doped fluoride fiber. Using Ho(3+)-doped silica fiber, a maximum output power of 55 mW at 2.1 microm was generated at a slope efficiency of 27%, a value limited by the presence of pump excited state absorption.
Diode Pumped Erbium Cascade Fiber Lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2011
Experimental and theoretical analysis of Dy3+-doped fiber lasers for efficient yellow emission
Publisher: Optica Publishing Group
Date: 24-05-2021
DOI: 10.1364/AO.426360
Abstract: We report a detailed experimental and theoretical analysis of the 4 F 9 / 2 to 6 H 13 / 2 lasing transition of a dysprosium ( D y 3 + )-doped ZBLAN fiber, a strong candidate for future compact and highly efficient yellow laser emission. Experimentally, we used a gallium nitride laser diode emitting at 447 nm as a pump source and measured yellow laser output generated with a maximum slope efficiency of 33%, which is less than half of the Stokes limit (of ∼ 78 % ). This result is commensurate with two other reports of yellow emission from D y 3 + . As a result, we developed a numerical model to understand and analyze the improvement potential of this fiber laser system. For reliable spectroscopic data input to the numerical model, we measured the absorption and emission cross sections from D y 3 + -doped ZBLAN glass. We investigated the potential causes of the low experimental slope efficiency and found contributions from the background loss of the fiber and excited-state absorption (ESA) of the intracavity yellow light. We estimated the signal re-absorption cross section using the emission cross section and the McCumber relation, which was subsequently used in our numerical model to compare successfully with our experimental results. We show that the ESA can be reduced for future D y 3 + -doped yellow laser systems by cascade lasing or co-doping with a suitable rare earth ion desensitizer.
Towards high-power mid-infrared emission from a fibre laser
Publisher: Springer Science and Business Media LLC
Date: 28-06-2012
1 W diode-pumped tunable Ho3+, Pr3+-doped fluoride glass fibre laser
Publisher: Institution of Engineering and Technology (IET)
Date: 2011
DOI: 10.1049/EL.2011.1907
Low propagation loss silicon-on-sapphire nanowires for the mid-IR
Publisher: IEEE
Date: 07-2011
Single frequency fiber laser operating at 2.9 µm
Publisher: OSA
Date: 2013
High-power actively mode-locked sub-nanosecond Tm^3+-doped silica fiber laser
Publisher: The Optical Society
Date: 23-06-2011
DOI: 10.1364/OL.36.002483
Forced pump oscillation at anti-Stokes wavelength of coupled Raman fibre laser resonators
Publisher: Institution of Engineering and Technology (IET)
Date: 2006
DOI: 10.1049/EL:20063613
Large diffractive scattering losses in the visible region produced by femtosecond laser written Bragg gratings
Publisher: IEEE
Date: 07-2008
Air-clad fibre laser with internal Bragg grating
Publisher: Institution of Engineering and Technology (IET)
Date: 2005
DOI: 10.1049/EL:20052851
Power scaling of a 60% efficient, 793 nm pumped, 2 μm large mode area fibre laser
Publisher: IEEE
Date: 07-2006
Ultrafast fiber lasers in the mid-IR water vapor window
Publisher: OSA
Date: 2017
Q-switched Dy:ZBLAN fiber lasers beyond 3 μm: comparison of pulse generation using acousto-optic modulation and inkjet-printed black phosphorus
Publisher: The Optical Society
Date: 10-05-2019
DOI: 10.1364/OE.27.015032
Mid-infrared Lasers for Medical Applications: introduction to the feature issue
Publisher: The Optical Society
Date: 15-11-2018
DOI: 10.1364/BOE.9.006255
High-efficiency watt-level mid-infrared fiber lasers beyond 3 µm using Dy:ZBLAN
Publisher: OSA
Date: 2018
Line-by-line Femtosecond FBG Inscription for Innovative Fiber Lasers
Publisher: OSA
Date: 2018
OP-GaAs OPO Pumped by a Q-switched Tm, Ho:silica Fiber Laser
Publisher: OSA
Date: 2009
Mode-locked mid-IR fibre laser based on 2D nanomaterials
Publisher: SPIE
Date: 30-12-2019
DOI: 10.1117/12.2539898
In-fibre polarizer for mid-infrared fibre lasers based on 45° tilted fluoride fibre Bragg grating
Publisher: OSA
Date: 2018
Highly efficient free running cascaded Raman fiber laser that uses broadband pumping
Publisher: Optica Publishing Group
Date: 2005
Abstract: A 3rd-order cascaded Raman fiber laser has been demonstrated without using fiber Bragg gratings at all in the entire laser system. More than 2 W output power at the 3rd Stokes emission wavelength of 1307 nm, a bandwidth of 4.2 nm and a slope efficiency of ~46% was measured when a 500 m long moderately Ge-doped silica fiber was pumped by a free running broadband Yb3+-doped fiber laser. This method is simple, versatile and cheap when compared with conventional methods employing narrow band pumping and fiber Bragg gratings to resonate the Stokes wavelengths. A slope efficiency of ~72% and an output power of over 4 W was also achieved at the 1st order Stokes wavelength of 1168 nm when a 130 m long Ge-doped silica fiber was used.
Energy transfer processes in rare-earth-doped glass fiber
Publisher: Elsevier
Date: 2022
High-Power and Ultra-Efficient Operation of a Tm^3+-doped Silica Fiber Laser
Publisher: OSA
Date: 2005
Narrow (100 pm) linewidth fibre laser operating in excess of 50 W
Publisher: IEEE
Date: 06-2007
Laser-tissue interaction with a high-power 2-?m fiber laser: Preliminary studies with soft tissue
Publisher: Wiley
Date: 1999
DOI: 10.1002/(SICI)1096-9101(1999)25:5<407::AID-LSM7>3.0.CO;2-9
Abstract: Recent developments in fiber laser technology have introduced highly efficient, compact sources with high output beam quality. The first laser-tissue interaction studies with a high-power 2-microm fiber laser were conducted. Chicken breast and porcine muscle tissue s les were subjected to continuous wave (cw) irradiation at 800-mW and 5-W output power levels, with spot sizes of approximately 150 microm. After laser irradiation, s les were inspected with an optical microscope and prepared for histologic processing. Evaluation of surface changes in tissue s les indicated an interaction similar in nature to those previously demonstrated with other cw lasers, but with photothermal ablation characteristics typical of strongly absorbed lasers operating in the infrared wavelength region. An ablation velocity of 0.27 mm.sec(-1) in porcine tissue was determined at 800-mW incident power. Histopathologic analysis demonstrated the formation of lesions with minimal damage at boundaries and no evidence of carbonization. Results indicate that this fiber laser has the potential to fulfill applications in the medical field.
Application and development of high-power and highly efficient silica-based fiber lasers operating at 2 mu m
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2007
Getting the most from your fluoride fibres
Publisher: IEEE
Date: 06-2013
Multiwavelength diode-cladding-pumped Nd/sup 3+/-doped germano-aluminosilicate fiber laser
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2003
Highly efficient mid-infrared dysprosium fiber laser
Publisher: The Optical Society
Date: 03-05-2016
DOI: 10.1364/OL.41.002173
High-power and highly efficient diode-cladding-pumped Ho^3+-doped silica fiber lasers
Publisher: Optica Publishing Group
Date: 14-11-2007
DOI: 10.1364/OL.32.003349
Abstract: We demonstrate high-power operation from a singly Ho3+-doped silica fiber laser that is cladding pumped directly with diode lasers operating at 1150 nm. Internal slope efficiencies approaching the Stokes limit were produced, and the maximum output power was 2.2W. This result was achieved using a low Ho3+-ion concentration and La3+-ion codoping, which together limit the transfer of energy between excited Ho3+ ions.
Long-period grating as wavelength specific loss elements in fibre lasers
Publisher: Institution of Engineering and Technology (IET)
Date: 2007
DOI: 10.1049/EL:20070758
High-power diode-cladding-pumped Tm 3+ , Ho 3+ -doped silica fibre laser
Publisher: Springer Science and Business Media LLC
Date: 10-2003
Recent advances in high-power silica-fibre lasers operating at 2 μm
Publisher: SPIE
Date: 21-12-2007
DOI: 10.1117/12.768903
Tuned Cascade Laser
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2012
Mid-IR tunable CW and passively Q-switched laser operation of Dy-doped fluoride fiber
Publisher: Optica Publishing Group
Date: 16-03-2022
DOI: 10.1364/OME.453046
Abstract: We report a comprehensive characterization of tunable continuous-wave (CW) and passive Q-switching laser performance of Dy-doped zirconium fluoride fiber emitting around 3 µm. The in-band pumped CW laser operation is investigated for pump wavelengths varying from 2.7 µm to 2.825 µm, for fiber lengths ranging from 0.4 m to 2 m, and for output coupling efficiency from 10% to 50%, leading to a maximum laser slope efficiency of 44% and a tuning range larger than 300 nm. With Findlay-Clay analysis and Rigrod analyses, optimal cavity parameters are retrieved, paving the way for further optimizations in performance. The passively Q-switched laser operation of Dy-doped fluoride fiber is achieved employing a semiconductor saturable absorber mirror for the first time, demonstrating a stable operation with a minimum pulse duration of 580 ns, a highest repetition frequency of 103 kHz and a pulse energy up to 300 nJ.
Efficient holmium-doped fluoride fiber laser emitting 21 µm and blue upconversion fluorescence upon excitation at 2 µm
Publisher: Optica Publishing Group
Date: 07-09-2010
DOI: 10.1364/OE.18.020164
Recent progress towards efficient and powerful fibre laser emission at 3 μm
Publisher: SPIE
Date: 23-05-2013
DOI: 10.1117/12.2020619
High peak power actively Q‐switched Ho 3 + , Pr 3 + ‐co‐doped fluoride fibre laser
Publisher: Institution of Engineering and Technology (IET)
Date: 06-2013
DOI: 10.1049/EL.2013.0134
Toward all-fiber supercontinuum spanning the mid-infrared
Publisher: The Optical Society
Date: 27-09-2017
Diode pumped silicate fiber for yellow laser emission
Publisher: Optica Publishing Group
Date: 03-11-2021
DOI: 10.1364/OSAC.444635
Abstract: We demonstrate yellow laser emission using silicate glass fiber as the gain medium. By employing core pumping using widely available GaN diode lasers with emission at 445 nm, we show that Dy 3+ -doped aluminosilicate glass fiber can be readily excited creating sufficient gain at 581 nm. In this proof of concept demonstration, the maximum output power generated was 3 mW with a slope efficiency approximately 1.8% with respect to the injected pump. This first-in-class demonstration opens a new field within fiber laser research.
Efficient 2.9 μm fluorozirconate glass waveguide chip laser
Publisher: The Optical Society
Date: 15-07-2013
DOI: 10.1364/OL.38.002588
Yellow emission from dysprosium-doped ZBLAN fiber laser
Publisher: SPIE
Date: 21-02-2020
DOI: 10.1117/12.2547155
Optical loss mechanisms in femtosecond laser-written point-by-point fibre Bragg gratings
Publisher: Optica Publishing Group
Date: 27-08-2008
DOI: 10.1364/OE.16.014248
Abstract: Fibre Bragg gratings inscribed with the point-by-point method using a Ti-sapphire femtosecond laser operating at 800 nm are shown to display strong increasing attenuation towards shorter wavelengths with a large and spectrally sharp recovery observed below 400 nm. The origin of this loss is shown to be Mie scattering, and the sharp recovery in the transmission results from wavelength dependent scattering within the numerical aperture of the core. The permanent losses from these Type II gratings have implications for high temperature sensors and fibre lasers.
High-power erbium cascade fibre laser
Publisher: Institution of Engineering and Technology (IET)
Date: 2009
DOI: 10.1049/EL.2009.1526
Efficient high power operation of a Tm-doped silica fiber laser pumped at 1.319 μm
Publisher: Elsevier BV
Date: 02-2000
New excitation wavelengths for dysprosium-doped mid-infrared fiber lasers
Publisher: SPIE
Date: 21-02-2020
DOI: 10.1117/12.2547152
Dysprosium doped ZBLAN yellow fibre lasers
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C1A_4
Abstract: We report a dysprosium doped ZBLAN yellow fibre laser by exploiting 4 F 9/2 to 6 H 13/2 transition of a dysprosium ion. A GaN laser diode emitting at 445 nm is used as a pump source.
Characterisation of a Nd3+-doped fibre laser incorporating an etalon formed between the fibre facet and dielectric mirror
Publisher: Elsevier BV
Date: 10-2004
85W Tm3+-doped silica fibre laser
Publisher: Institution of Engineering and Technology (IET)
Date: 2005
DOI: 10.1049/EL:20051207
Numerical Modeling of Holmium-Doped Fluoride Fiber Lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2012
Excited state dynamics of the Ho3+ ions in holmium singly doped and holmium, praseodymium-codoped fluoride glasses
Publisher: AIP Publishing
Date: 15-06-2007
DOI: 10.1063/1.2749285
Abstract: The deactivation of the two lowest excited states of Ho3+ was investigated in Ho3+ singly doped and Ho3+, Pr3+-codoped fluoride (ZBLAN) glasses. We establish that 0.1–0.3mol% Pr3+ can efficiently deactivate the first excited (I75) state of Ho3+ while causing a small reduction of ∼40% of the initial population of the second excited (I65) state. The net effect introduced by the Pr3+ ion deactivation of the Ho3+ ion is the fast recovery of the ground state of Ho3+. The Burshstein model parameters relevant to the Ho3+→Pr3+ energy transfer processes were determined using a least squares fit to the measured luminescence decay. The energy transfer upconversion and cross relaxation parameters for 1948, 1151, and 532nm excitations of singly Ho3+-doped ZBLAN were determined. Using the energy transfer rate parameters we determine from the measured luminescence, a rate equation model for 650nm excitation of Ho3+-doped and Ho3+, Pr3+-doped ZBLAN glasses was developed. The rate equations were solved numerically and the population inversion between the I65 and the I75 excited states of Ho3+ was calculated to examine the beneficial effects on the gain associated with Pr3+ codoping.
Efficient double-clad Yb3+-doped silica fibre laser pumped by an unfocused diode laser
Publisher: Elsevier BV
Date: 08-2008
Dual wavelength Q-switched cascade laser
Publisher: The Optical Society
Date: 04-06-2012
DOI: 10.1364/OL.37.002208
High-average-power actively-mode-locked Tm3+ fiber lasers
Publisher: SPIE
Date: 09-02-2012
DOI: 10.1117/12.906649
Photodarkening study of gratings written into rare-earth doped optical fibres using a femtosecond laser
Publisher: SPIE
Date: 21-12-2007
DOI: 10.1117/12.760829
Passively Q-switched Tm^3+-doped silica fiber lasers
Publisher: Optica Publishing Group
Date: 15-05-2007
DOI: 10.1364/AO.46.003311
Abstract: By splicing on a length of Ho(3+)-doped silica fiber onto a diode-pumped double-clad Tm(3+)-doped silica fiber, stable passive Q switching of the Tm(3+)-doped silica fiber laser is demonstrated. The formation of Q-switched pulses was found to depend on both the length and the position of the Ho(3+)-doped silica fiber that was inserted into the fiber laser cavity. For stable Q-switched pulse generation, Ho(3+)-doped silica fiber lengths shorter than twice the absorption depth must be used. For long Ho(3+)-doped silica fiber lengths, randomly generated pulses are observed at operating wavelengths longer than 2090 nm, which are attributed to intracavity pumping of the Ho(3+)-doped silica fiber.
OP-GaAs OPO pumped by 2μm Q-switched lasers: Tm;Ho:silica fiber laser and Ho:YAG laser
Publisher: SPIE
Date: 07-10-2010
DOI: 10.1117/12.865217
Octave Spanning Supercontinuum in an As2S3 Taper using Ultra-low Pump Pulse Energy
Publisher: OSA
Date: 2011
Spectroscopic properties of ytterbium, praseodymium-codoped fluorozirconate glass for laser emission at 36 μm
Publisher: The Optical Society
Date: 02-05-2013
Ho-doped tellurite glasses for emission in the mid infrared wavelength region
Publisher: IEEE
Date: 05-2011
Direct infrared femtosecond laser inscription of chirped Bragg gratings into silica and fluoride fibers
Publisher: OSA
Date: 2016
High-efficiency fluoroindate glass fiber laser
Publisher: Optica Publishing Group
Date: 10-05-2023
DOI: 10.1364/OL.486318
Abstract: We report the high-efficiency operation of a 3.05 µm dysprosium-doped fluoroindate glass fiber laser that is in-band pumped at 2.83 µm using an erbium-doped fluorozirconate glass fiber laser. The demonstrated slope efficiency of the free-running laser of 82% represents approximately 90% of the Stokes efficiency limit a maximum output power of 0.36 W, the highest for a fluoroindate glass fiber laser, was recorded. Narrow-linewidth wavelength stabilization at 3.2 µm was achieved by utilizing a first-reported, to the best of our knowledge, high-reflectivity fiber Bragg grating inscribed in the Dy 3+ -doped fluoroindate glass. These results lay the foundation for future power-scaling of mid-infrared fiber lasers using fluoroindate glass.
Energy transfer and energy level decay processes in Tm3+-doped tellurite glass
Publisher: AIP Publishing
Date: 15-03-2012
DOI: 10.1063/1.3694747
Abstract: The primary excited state decay and energy transfer processes in singly Tm3+-doped TeO2:ZnO:Bi2O3:GeO2 (TZBG) glass relating to the 3F4 → 3H6 ∼1.85 μm laser transition have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the 3H4 manifold at 794 nm, the 3H5 manifold at 1220 nm, and 3F4 manifold at 1760 nm has established that the 3H5 manifold is entirely quenched by multiphonon relaxation in tellurite glass. The luminescence from the 3H4 manifold with an emission peak at 1465 nm suffers strong suppression due to cross relaxation that populates the 3F4 level with a near quadratic dependence on the Tm3+ concentration. The 3F4 lifetime becomes longer as the Tm3+ concentration increases due to energy migration and decreases to 2.92 ms when [Tm3+] = 4 mol. % as a result of quasi-resonant energy transfer to free OH− radicals present in the glass at concentrations between 1 × 1018 cm−3 and 2 × 1018 cm−3. Judd-Ofelt theory in conjunction with absorption measurements were used to obtain the radiative lifetimes and branching ratios of the energy levels located below 25 000 cm−1. The spectroscopic parameters, the cross relaxation and Tm3+(3F4) → OH− energy transfer rates were used in a numerical model for laser transitions emitting at 2335 nm and 1865 nm.
Power scaling concepts for mid-infrared fibre lasers using fluoride glass
Publisher: OSA
Date: 2016
Tunable dysprosium laser
Publisher: The Optical Society
Date: 23-09-2016
DOI: 10.1364/OL.41.004496
Stable high-power continuous-wave Yb3+-doped silica fiber laser utilizing a point-by-point inscribed fiber Bragg grating
Publisher: Optica Publishing Group
Date: 04-05-2007
DOI: 10.1364/OL.32.001486
Abstract: We report on a narrowband 5 W cw fiber laser incorporating a point-by-point fiber Bragg grating inscribed into the core of a Yb(3+)-doped double-clad fiber. The laser featured excellent long-term wavelength and power stability (0.3%), as well as a very narrow (15 pm) linewidth, when passive temperature stabilization of the grating was implemented.
Energy transfer processes inEr
Publisher:
American Physical Society (APS)
Date:
07-2000
Publisher: American Physical Society (APS)
Date: 07-2000
Theoretical modeling of diode-laser-pumped 3-μm Er3+ crystal lasers
Publisher: SPIE
Date: 02-05-1997
DOI: 10.1117/12.273682
High power Tm3+-doped silica fibre laser fabricated using chelate delivery deposition
Publisher: Elsevier BV
Date: 02-2003
FBG-stabilized Dysprosium:fluoroindate mid-infrared fiber laser
Publisher: IEEE
Date: 26-06-2023
Dysprosium-doped ZBLAN fiber laser tunable from 2.8 μm to 3.4 μm, pumped at 1.7 μm
Publisher: The Optical Society
Date: 16-02-2018
DOI: 10.1364/OL.43.000971
Thermal Analysis Study of the Growth Kinetics of Carbon Nanotubes and Epitaxial Graphene Layers on Them
Publisher: American Chemical Society (ACS)
Date: 11-05-2009
DOI: 10.1021/JP901245U
Reply to Comment on Passively Q-switched fiber laser that uses saturable Raman gain
Publisher: Optica Publishing Group
Date: 25-08-2006
DOI: 10.1364/OL.31.002739
Energy level decay processes in Ho3+-doped tellurite glass relevant to the 3 μm transition
Publisher: AIP Publishing
Date: 15-05-2011
DOI: 10.1063/1.3587476
Abstract: The primary excited state decay processes relating to the 5I6 → 5I7 ∼ 2.9 μm laser transition in singly Ho3+-doped tellurite (TZBG) glass have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the 5I6 energy level at 1151 nm and 5I7 energy level at 1958 nm has established that the rate of energy transfer up-conversion between holmium ions excited to the 5I7 level is negligible for Ho3+ concentrations up to 4 mol. %. Excited state absorption was not observed from either the 5I7 or 5I6 levels and the luminescence from the 5I7 and 5I6 energy levels was measured to peak at ∼2050 nm and ∼2930 nm, respectively. The 5I6 level has a low luminescence efficiency of ∼8.9% due to strong nonradiative multiphonon relaxation. In contrast, decay from the 5I7 level is essentially fully radiative. A linear decrease in the decay time of the 5I6 level with Ho3+ concentration augmentation results from energy transfer to OH− ions in the glass (with NOH ∼ 8.2 × 1017 ions cm−3) and reduces the luminescence efficiency of the 5I6 level to 8% for [Ho3+] = 4 mol. %. Numerical simulation of a fiber laser incorporating 4 mol. % Ho3+ showed that a population inversion of ∼7.8% is reached for square pulses of 100 μs duration and a repetition frequency of 20 Hz at a moderate pump intensity of 418 kW cm−2 if energy transfer to OH− radicals is neglected.
Efficient high power operation of a Nd:YAG-pumped Yb:Er-doped silica fibre laser
Publisher: Elsevier BV
Date: 12-1999
8.8 W diode-cladding-pumped Tm3+,Ho3+-doped fluoride fibre laser
Publisher: Institution of Engineering and Technology (IET)
Date: 2001
DOI: 10.1049/EL:20010578
Fiber-based sources of coherent MIR radiation: key advances and future prospects (invited)
Publisher: Optica Publishing Group
Date: 10-2020
DOI: 10.1364/OE.400003
Abstract: The mid-infrared (MIR) represents a large portion of the electromagnetic spectrum that is progressively being exploited for an enormous number of applications. Thermal imaging cameras, dental and skin resurfacing lasers, and narcotics detectors at airports are all mainstream ex les involving the MIR, but potential applications of MIR technologies are much larger. Accessing the unique opportunities afforded by the MIR is critically dependent on the specific characteristics of MIR emitting sources that become available. In this review, we survey an important enabling technology to the opening up of MIR science and applications, namely that driven by fiber-based sources of coherent MIR radiation . In this review paper, we describe many of the key advances in the innovation and development of such sources over the past few decades and discuss many of the underlying science and technology issues that have resulted in specific recent source achievements, especially in light of new applications enabled by these new source capabilities. We also discuss a few specific anticipated future needs and some potentially disruptive approaches to future MIR fiber source development.
Modeling and Optimization of Cascaded Erbium and Holmium Doped Fluoride Fiber Lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2014
Tm-doped silicate glass fibre lasers: the foundation technology for high-power mid-infrared light generation
Publisher: SPIE
Date: 10-02-2011
DOI: 10.1117/12.879621
Linearly polarized fiber laser using a point-by-point Bragg grating in a single-polarization photonic bandgap fiber
Publisher: The Optical Society
Date: 13-05-2011
DOI: 10.1364/OL.36.001872
The spectroscopic and energy transfer characteristics of the rare earth ions used for silicate glass fibre lasers operating in the shortwave infrared
Publisher: Wiley
Date: 09-2009
Erbium-doped Mid-Infrared Fiber Lasers
Publisher: OSA
Date: 2016
Octave-spanning supercontinuum in the mid-IR with a 3 μm ultrafast fiber laser
Publisher: OSA
Date: 2017
Low propagation loss silicon-on-sapphire waveguides for the mid-infrared
Publisher: The Optical Society
Date: 25-07-2011
DOI: 10.1364/OE.19.015212
Continuous wave 2.9 μm dysprosium-doped fluoride fiber laser
Publisher: AIP Publishing
Date: 12-08-2003
DOI: 10.1063/1.1603353
Abstract: Single-mode room-temperature cw laser emission on the H13/26→H15/26 2.9 μm phonon terminated electronic transition of Dy3+ is demonstrated. The maximum output power of 0.275 W was generated at a slope efficiency of 4.5% (with respect to the absorbed pump power) when a Dy3+-doped ZBLAN fiber laser was tandem pumped with the ∼1100 nm output from a diode-cladding-pumped Yb3+-doped silica fiber laser.
Ultrafast fiber lasers in the 3 μm water window
Publisher: OSA
Date: 2017
Diffraction in air-clad fibres.
Publisher: Optica Publishing Group
Date: 2005
Abstract: The angular transmissivity of high numerical aperture air-clad fibres is measured as a function of skewness of the launched light. Within the experimental limits the measured transmissivity of skew rays is significantly lower compared to theoretical predictions for air-clad fibres with uniform cladding surfaces. The discrepancy is attributed to diffractive losses of skew rays from the periodic corrugations at the pump core-cladding air interface.
Versatile and widely tunable mid-infrared erbium doped ZBLAN fiber laser
Publisher: The Optical Society
Date: 04-2016
DOI: 10.1364/OL.41.001676
Energy recycling versus lifetime quenching in erbium-doped 3-μm fiber lasers
Publisher: IEEE
Date: 2000
Single-polarization operation in birefringent all-solid hybrid microstructured fiber with additional stress applying parts
Publisher: Optica Publishing Group
Date: 07-10-2009
DOI: 10.1364/OL.34.003119
2.7-W Ho3+-doped silica fibre laser pumped at 1100�nm and operating at 2.1�?m
Publisher: Springer Science and Business Media LLC
Date: 07-2003
Thulium-ytterbium co-doped fiber laser with 75 W of output power at 2 μm
Publisher: SPIE
Date: 23-12-2004
DOI: 10.1117/12.578727
Thermal modeling of solid nonfocusing pump-light collectors used for diode-pumped Nd: YAG lasers
Publisher: Optica Publishing Group
Date: 20-04-1995
DOI: 10.1364/AO.34.002012
Power scaling of 2 [micro sign]m ytterbium-sensitised thulium-doped silica fibre laser diode-pumped at 975 nm
Publisher: Institution of Engineering and Technology (IET)
Date: 2005
DOI: 10.1049/EL:20057534
Energy level decay and excited state absorption processes in erbium-doped tellurite glass
Publisher: AIP Publishing
Date: 15-10-2011
DOI: 10.1063/1.3651399
Abstract: The fundamental excited state decay processes relating to the 4I11/2 → 4I13/2 transition in singly Er3+-doped tellurite (TZNL) glass have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the 4I11/2 energy level at 970 nm and selective laser excitation of the 4I13/2 energy level at 1485 nm has established that energy transfer upconversion by way of a dipole-dipole interaction between two excited erbium ions in the 4I13/2 level populates the 4I11/2 upper laser level of the 3 μm transition. This upconversion has been analyzed for Er2O3 concentrations between 0.5 mol. % and 2.2 mol. %. The 4I13/2 and 4I11/2 energy levels emit luminescence with peaks located at 1532 nm and 2734 nm, respectively, with radiative decay efficiencies of 65% and 6.8% for the higher (2.2 mol. %) concentration s le. The low 2.7 μm emission efficiency is due to the non-radiative decay bridging the 4I11/2 → 4I13/2 transition and energy transfer to the OH− groups in the glass. Excited state absorption was observed to occur from the 4I13/2 and 4I11/2 levels with peak absorptions occurring at 1550 nm and 971 nm, respectively. The decay time of the 4I11/2 excited state decreased with an increase in the Er3+ concentration, which related to energy transfer to OH− ions that had a measured concentration of 6.6 × 1018 cm−3. Results from numerical simulations showed that a population inversion is reached at a threshold pumping intensity of ∼80 kW cm−2 for a cw laser pump at 976 nm if [Er3+] ≥ 1.2 × 1021 cm−3 (or [Er2O3] ≥ 2.65 mol. %) without OH− impurities being present.
100 W CW Yb3+-doped silica fiber laser utilizing an active-core inscribed point-by-point bragg grating
Publisher: OSA
Date: 2007
Fiber Lasers that Bridge the Shortwave to Midwave Regions of the Infrared Spectrum
Publisher: Wiley
Date: 18-07-2012
Spectroscopy of mid-infrared (29 μm) fluorescence and energy transfer in Dy^3+-doped tellurite glasses
Publisher: The Optical Society
Date: 05-02-2014
Photo-annealing of femtosecond laser written Bragg gratings
Publisher: IEEE
Date: 07-2008
A 4W tunable Tm3+:Ho3+ silica fibre laser
Publisher: IEEE
Date: 05-2008
Progress in mid-infrared fiber source development
Publisher: Springer Singapore
Date: 2019
Efficient high power operation of erbium 3 [micro sign]m fibre laser diode-pumped at 975 nm
Publisher: Institution of Engineering and Technology (IET)
Date: 2000
DOI: 10.1049/EL:20000207
Introduction to the Issue on Organic and Inorganic Photonic Materials
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2008
Diode-Pumped Nd:YAG Lasers Using Solid Non-Focussing Collector Geometry
Publisher: OSA
Date: 1992
Sequence lasing in a gain-switched Yb^3+,Er^3+-doped silica double-clad fiber laser
Publisher: Optica Publishing Group
Date: 20-03-2002
DOI: 10.1364/AO.41.001698
Abstract: Experimental results relating to the gain-switched operation of a double-clad Yb3+,Er(3+)-doped silica fiber laser that is pulse pumped with the output from a flash-l -pumped Ti:sapphire laser are presented. For all the configurations of the fiber laser that we studied, the 2F5/2-->2F7/2 laser transition of the Yb3+ ion lased prior to laser emission from the 4I13/2-->4I15/2 transition of the Er3+ ion. To the best of our knowledge, this is the first reported operation of sequence lasing in the Yb3+,Er(3+)-codoped system. This succession of laser pulses deduced from the measurements of this investigation is a consequence of both the short intense pump pulse and the short 900-nm wavelength of the pump that does not overlap with any important excited-state absorption transitions. We believe that the predominant interionic interaction during the course of the pump pulse is the double-energy transfer to the Er3+ ion acting twice from the 2F5/2 energy level of the Yb3+ donor ion. A maximum total output of 1.65 mJ is obtained (1.38 mJ from the 2F5/2-->2F7/2 transition of Yb3+ and 0.27 mJ from the 4I13/2-->4I15/2 transition of Er3+) from a nonoptimized configuration of the fiber laser. The wavelength of the output from the fiber laser was measured to vary approximately linearly with fiber length from 1040 to 1046 nm for the Yb(3+)-based laser and 1535 to 1541 nm for the Er(3+)-based laser.
Emission beyond 4 μm and mid-infrared lasing in a dysprosium-doped indium fluoride (InF3 ) fiber
Publisher: The Optical Society
Date: 13-04-2018
DOI: 10.1364/OL.43.001926
Erbium-doped mid-infrared fiber lasers
Publisher: SPIE
Date: 13-05-2019
DOI: 10.1117/12.2524138
Actively Q-switched Tm<sup>3+</sup>-doped and Tm<sup>3+</sup>, Ho<sup>3+</sup>-codoped silica fiber lasers
Publisher: IEEE
Date: 05-2008
In-fibre resonant pumping of a fibre laser
Publisher: IEEE
Date: 07-2008
Novel mid-infrared fiber laser sources
Publisher: IEEE
Date: 07-2017
Comparative study of continuous wave Tm3+-doped silica and fluoride fiber lasers
Publisher: Springer Science and Business Media LLC
Date: 28-11-2007
Encapsulated rod for efficient thermal management in diode-side-pumped Nd:YAG lasers
Publisher: Optica Publishing Group
Date: 20-05-1996
DOI: 10.1364/AO.35.002562
Novel laser sources in the mid-Infrared
Publisher: IEEE
Date: 10-2012
Midinfrared Holmium Fiber Lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2006
Energy level decay and excited state absorption processes in dysprosium-doped fluoride glass
Publisher: AIP Publishing
Date: 03-2010
DOI: 10.1063/1.3311561
Abstract: The primary excited state decay processes relating to the H613/2→H615/2∼3 μm laser transition in singly Dy3+-doped fluoride (ZBLAN) glass have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the F69/2, H67/2 energy levels at 1125 nm and F611/2, H69/2 energy levels at 1358 nm established that the energy levels above the H611/2 level, excluding the F49/2 level, are entirely quenched by multiphonon emission in ZBLAN glass. The H611/2 and H613/2 energy levels emit luminescence with peaks at ∼1700 and ∼2880 nm, respectively, but at low quantum (luminescence) efficiencies. The quantum efficiency of the H611/2 level and H613/2 level is ∼9×10−5 and ∼1.3×10−2, respectively, for [Dy3+]=0.5 mol % based on calculations of the radiative lifetimes using the Judd–Ofelt theory. Excited state absorption (ESA) was detected by monitoring the rise time of the 1700 nm luminescence after tuning the probe wavelength across the spectral range from 1100 to 1400 nm. As a result of nonradiative decay of the higher excited states, ESA contributes to the heating of ∼3 μm fiber lasers based on Dy3+-doped fluoride glass. For [Dy3+] up to 4 mol %, we found no evidence of energy transfer processes between Dy3+ ions that influence the decay characteristics of the H611/2 and H613/2 energy levels.
Highly efficient and wavelength-tunable Holmium-doped silica fibre lasers
Publisher: IEE
Date: 2005
DOI: 10.1049/CP:20050668
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