ORCID Profile
0000-0002-1299-8600
Current Organisation
University of South Australia
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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)
Photonics, Optoelectronics and Optical Communications | Optical Physics | Functional Materials | Nonlinear optics and spectroscopy | Glass | Mineral Processing/Beneficiation | Materials Engineering | Nonlinear Optics and Spectroscopy | Atomic molecular and optical physics | Photonics and Electro-Optical Engineering (excl. Communications) | Optical Properties of Materials | Chemical Spectroscopy | Control Systems, Robotics and Automation | Decision Support and Group Support Systems | Nanofabrication growth and self assembly | Optical Physics Not Elsewhere Classified | Photonics optoelectronics and optical communications | Communications Technologies | Medical Biotechnology | Medical Biotechnology Diagnostics (incl. Biosensors) | Atomic molecular and optical physics not elsewhere classified | Lasers and Quantum Electronics | Optics And Opto-Electronic Physics | Biomedical Instrumentation | Macromolecular and Materials Chemistry | Optical And Photonic Systems | Physical Chemistry (Incl. Structural) | Electrical and Electronic Engineering | Nanophotonics | Astronomical instrumentation | Analytical Chemistry not elsewhere classified | Interdisciplinary Engineering Not Elsewhere Classified | Photonic and electro-optical devices sensors and systems (excl. communications) | Electronics sensors and digital hardware
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Physical Sciences | Expanding Knowledge in the Chemical Sciences | Physical sciences | Mining and Extraction of Copper Ores | Industrial Instruments | Scientific Instruments | Telecommunications | Combined operations | National Security | Chemical sciences | Veterinary Diagnostics | Structural Glass and Glass Products | Mining and Extraction of Precious (Noble) Metal Ores | Primary Mining and Extraction of Mineral Resources not elsewhere classified | Scientific instrumentation | Diagnostic Methods | Basic Zinc Products | Expanding Knowledge in Engineering | Beneficiation or Dressing of Iron Ores |
Related Links
Publications
Short-range non-bending fully distributed water/humidity sensors
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2019
Narrow linewidth single-mode chip laser operating at 2.9 µm
Publisher: OSA
Date: 2019
A numerical study of single-pulse dual-wavelength mode-locked waveguide laser
Publisher: IEEE
Date: 07-2017
In fiber resonant pumping of a fiber laser
Publisher: SPIE
Date: 12-02-2021
DOI: 10.1117/12.813921
A large core microstructured fluoride glass optical fibre for mid-infrared single-mode transmission
Publisher: Elsevier BV
Date: 08-2009
Towards new fiber optic sensors based on the vapor deposited conducting polymer PEDOT: Tos
Publisher: The Optical Society
Date: 04-11-2019
DOI: 10.1364/OME.9.004517
Femtosecond laser direct-written microstructured waveguides in passive as well as in novel active glasses
Publisher: IEEE
Date: 07-2012
Trace gas spectroscopy using a periodically poled LiNbO/sub 3/ waveguide based mid-infrared difference frequency sensor
Publisher: Opt. Soc. America
2.1 μm waveguide laser fabricated by femtosecond laser direct-writing in Ho3+, Tm3+: ZBLAN glass
Publisher: The Optical Society
Date: 06-03-2012
DOI: 10.1364/OL.37.000996
Theoretical modeling of the Faraday effect within a gas-filled photonic bandgap fiber
Publisher: SPIE
Date: 20-05-2013
DOI: 10.1117/12.2026059
Thermal-lens measurement of a quasi steady-state repetitively flashlamp-pumped Cr, Tm, Ho:YAG laser
Publisher: Elsevier BV
Date: 03-1998
Highly Narrow Linewidth, CW, All-Fiber Oscillator With a Switchable Linear Polarization
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2008
Fabrication of depressed cladding waveguide Bragg-gratings in rare-earth doped heavy-metal fluoride glass
Publisher: IEEE
Date: 05-2011
Low-noise dual-comb platform based on mode-locked lasers in a multi-waveguide chip
Publisher: OSA
Date: 2018
Towards distributed particle sensing using a few-mode exposed-core optical fibre with a spatially referenced evanescent field
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C4D_1
Abstract: We propose a two-dimensional distributed sensing scheme using few-mode exposed-core fibre and optical frequency domain reflectometry. This scheme aims to measure the size and position of particles using the evanescent field of different guided modes. © 2020 The Author(s)
85W Tm3+-doped 2μm fibre laser pumped at 793nm
Publisher: IEEE
Date: 2005
Design guidelines for collimating or focusing graded-index fiber tips
Publisher: Optica Publishing Group
Date: 09-2021
DOI: 10.1364/OE.433541
Abstract: Graded-index optical fiber probes suitable for focusing or collimating the output of an optical fiber at a wavelength of 1.3 µm have become an enabling technology in optical coherence tomography imaging applications for in vivo bioimaging. Such fiber tips however remain uncommon in other photonics applications. This paper provides the first numerical study of graded-index fiber tips covering a broad range of wavelengths spanning from the UV to short-infrared. The wavelength dependency and the influence of probe geometry on performance characteristics such as far-field ergence angle, spot size and working distance are analyzed. The paper yields easily accessible design guidelines for the fabrication of collimating or focusing fiber tips. Fiber collimators have considerable potential for use in free-space systems and could benefit a range of devices such as variable attenuators, dynamic wavelength equalisers and large 3D optical cross-connect switches, whereas focusing fiber tips have applications in high-resolution imaging.
Design considerations for graded index fiber tip Fabry-Perot interferometers
Publisher: IOP Publishing
Date: 12-03-2021
Abstract: An analysis is provided of fiber-optic Fabry–Perot interferometers designed and fabricated using collimating graded-index fiber (GIF) tips as an alternative to typical highly ergent standard single-mode fibers (SMFs). The collimated beam from the GIF tips allows for significantly longer etalons to be fabricated due to the increased collection efficiency when used either in reflection or transmission mode. We extend previous results, showing that GIF tips using coreless fiber segments can allow for up to four-fold increase in fringe visibility (FV) at 1550 nm compared with standard SMF Fabry–Perot etalons of the same length. The collimating GIF tips help lessen the FV vs cavity length trade-off typically observed in fiber-optic Fabry–Perot systems. We also explore the effects on FV improvement when using capillaries to align the fibres. This paper also provides easily accessible design guidelines and considerations for fabricating GIF based devices at 1550 nm.
Difference-frequency-based tunable absorption spectrometer for detection of atmospheric formaldehyde
Publisher: Optica Publishing Group
Date: 20-08-2000
DOI: 10.1364/AO.39.004436
Abstract: High-sensitivity detection of formaldehyde (CH2O) at 3.5315 micrometers (2831.64 cm-1) is reported with a diode-laser-pumped, fiber-coupled, periodically poled LiNbO3 spectroscopic source. This source replaced the Pb-salt diode laser Dewar assembly of an existing tunable diode-laser absorption spectrometer designed for ultrasensitive detection of CH2O. Spectra are recorded with 2f-modulation spectroscopy and zero-air rapid background subtraction. Initial measurements reported here, determined from multiple measurements of a flowing 7.7 parts per billion by volume (ppbv, parts in 10(9)) CH2O in air mixture, indicate replicate precisions as low as 0.24 ppbv.
Fiber-Coupled Multiplexed Independent Ho:ZBLAN Waveguide Chip Lasers in a Single Substrate
Publisher: MDPI AG
Date: 27-12-2022
DOI: 10.3390/PHOTONICS10010027
Abstract: A readily configurable and scalable 2 µm laser source with multi-channel/wavelength fiber output could be advantageous to 2 µm applications such as spectral-beam combination or fiber communications. We report the first experimental realization and characterization of a two-channel holmium-doped zirconium fluoride glass waveguide array laser pumped by a single thulium fiber laser at 1945 nm. Specific laser wavelengths are selected by fiber Bragg gratings (2076.7 nm and 2074.4 nm), and single channel powers of mW are achieved. Design and assembly details, and considerations for future improvements are discussed, including the potential extension to and beyond a 12 channel source.
Multi-point high temperature optical fiber sensor
Publisher: SPIE
Date: 30-12-2019
DOI: 10.1117/12.2541105
Super-fast optical hygrometer probe based on polyelectrolyte-coated fiber taper
Publisher: IEEE
Date: 07-2017
Versatile Waveguide Chip Laser for 2.9 μm Emission
Publisher: IEEE
Date: 06-2019
Femtosecond Chirped Pulse Oscillators for high-speed Photonic device fabrication
Publisher: IEEE
Date: 08-2011
Widely tunable, high slope efficiency waveguide lasers in a Yb-doped glass chip operating at 1 μm
Publisher: The Optical Society
Date: 13-04-2018
DOI: 10.1364/OL.43.001902
Efficient direct-laser written Yb:ZBLAN Waveguide Laser
Publisher: IEEE
Date: 04-2023
On-chip absorption spectroscopy enabled by graded index fiber tips
Publisher: Optica Publishing Group
Date: 08-12-2021
DOI: 10.1364/BOE.414239
Abstract: This paper describes the design and characterization of miniaturized optofluidic devices for sensing based on integrating collimating optical fibers with custom microfluidic chips. The use of collimating graded-index fiber (GIF) tips allows for effective fiber-channel-fiber interfaces to be realized when compared with using highly- ergent standard single-mode fiber (SMF). The reduction in both beam ergence and insertion losses for the GIF configuration compared with SMF was characterized for a 10.0 mm channel. Absorption spectroscopy was demonstrated on chip for the measurement of red color dye (Ponceau 4R), and the detection of thiocyanate in water and artificial human saliva. The proposed optofluidic setup allows for absorption spectroscopy measurements to be performed with only 200 µL of solution which is an order of magnitude smaller than for standard cuvettes but provides a comparable sensitivity. The approach could be integrated into a lab-on-a-chip system that is compact and does not require free-space optics to perform absorption spectroscopy.
Author Correction: Ultra-fast Hygrometer based on U-shaped Optical Microfiber with Nanoporous Polyelectrolyte Coating
Publisher: Springer Science and Business Media LLC
Date: 22-03-2018
DOI: 10.1038/S41598-018-22956-9
Abstract: A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
Femtosecond direct-write überstructure waveguide Bragg gratings in ZBLAN
Publisher: The Optical Society
Date: 20-09-2012
DOI: 10.1364/OL.37.003999
Mid-infrared difference-frequency generation source pumped by a 11–15-µm dual-wavelength fiber amplifier for trace-gas detection
Publisher: Optica Publishing Group
Date: 10-1998
DOI: 10.1364/OL.23.001517
Abstract: Continuous-wave mid-infrared radiation near 3.5 micrometers is generated by difference-frequency mixing of the output of a compact 1.1-1.5 micrometer dual-wavelength fiber lifier in periodically poled LiNbO3. The diode side-pumped lifier is constructed with double-cladding Yb-doped fiber followed by single-mode Er/Yb codoped fiber. Output powers of as much as 11 microW at 3.4 micrometers are obtained, and spectroscopic detection of CH4 and H2CO is demonstrated.
Power scaling of a 60% efficient, 793 nm pumped, 2 μm large mode area fibre laser
Publisher: IEEE
Date: 07-2006
A 40% slope efficiency 790nm pumped 1.9m Tμm3+: ZBLAN directly-written waveguide laser
Publisher: IEEE
Date: 05-2011
Air-Clad Holmium-Doped Silica Fiber Laser
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 02-2016
Tunable continuous wave DFG-based gas sensor using fibre amplified 1.5 [micro sign]m external cavity diode laser and high power 1 [micro sign]m diode laser
Publisher: Institution of Engineering and Technology (IET)
Date: 2000
DOI: 10.1049/EL:20001209
A europium metal–organic framework for dual Fe3+ ion and pH sensing
Publisher: Springer Science and Business Media LLC
Date: 14-07-2022
DOI: 10.1038/S41598-022-15663-Z
Abstract: Metal–organic frameworks (MOFs) with ratiometric sensing properties are desirable for many applications due to their intrinsic self-calibration. We report the re-assessment of the sensing properties of a MOF, originally reported as containing europium(III) and 2-hydroxyterephtalic acid, and having fluorescent ratiometric iron(III) sensing properties. Synchrotron single-crystal X-ray diffraction and proton nuclear magnetic resonance ( 1 H NMR) spectroscopy revealed that the MOF is composed of 2-methoxyterephthalate, not 2-hydroxyterephthalate as originally reported. We found that the MOF exhibits a sensor turn-off response towards Fe 3+ ion concentrations in the range 0.5–3.7 ppm (band 425 nm), and a turn-on response towards a decrease of pH from 5.4 to 3.0 (band 375 nm), both resulting from the addition of acidic Fe 3+ salt solution to a MOF suspension. Thus, the ratiometric sensing properties and the originally proposed mechanism no longer apply our work reveals a dynamic quenching mechanism for the fluorescence turn-off response due to the presence of Fe 3+ ions, and a ligand protonation mechanism for the turn-on response to a decrease in pH. Our work highlights the importance of a thorough investigation of the structure of any newly synthesized MOF, and, in the case of potential sensors, their selectivity and any environmental effects on their sensing behavior.
Power-scalable thulium and holmium fibre lasers pumped by 793 nm diode lasers
Publisher: OSA
Date: 2007
Short-wavelength infrared reflectance spectroscopy of minerals by supercontinuum illumination and speckle reduction
Publisher: Elsevier BV
Date: 09-2020
Versatile large-mode-area femtosecond laserwritten Tm:ZBLAN glass chip lasers
Publisher: The Optical Society
Date: 27-11-2012
DOI: 10.1364/OE.20.027503
Nitrate sensing using optical properties of PEDOT at the tip of the fibre
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.P3_21
Abstract: A sensing platform measuring the change in back reflection of PEDOT:Tos through a circulator is presented, enabling nitrate ion sensing as the refractive index and volume of PEDOT:Tos change at the tip of the optical fibre.
Extruded Microstructured Fiber Lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2012
An ultra-stable 2.9 μm guided-wave chip laser and application to nano-spectroscopy
Publisher: AIP Publishing
Date: 11-2019
DOI: 10.1063/1.5113624
Femtosecond laser induced structural changes in fluorozirconate glass
Publisher: The Optical Society
Date: 05-04-2013
DOI: 10.1364/OME.3.000574
Fibre coupled difference frequency generation utilising ytterbium-doped fibre amplifier and periodically poled LiNbO3
Publisher: Institution of Engineering and Technology (IET)
Date: 1998
DOI: 10.1049/EL:19980917
Fifty percent internal slope efficiency femtosecond direct-written Tm 3+:ZBLAN waveguide laser
Publisher: The Optical Society
Date: 22-04-2011
DOI: 10.1364/OL.36.001587
Efficient Nd:YAG pumped mid-IR laser based on cascaded KTP and ZGP optical parametric oscillators and a ZGP parametric amplifier
Publisher: Elsevier BV
Date: 2009
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
Compact mid-infrared trace gas sensor based on difference-frequency generation of two diode lasers in periodically poled LiNbO 3
Publisher: Springer Science and Business Media LLC
Date: 09-1998
Caged-Sphere Optofluidic Sensors: Whispering Gallery Resonators in Wicking Microfluidics
Publisher: MDPI AG
Date: 29-05-2022
DOI: 10.3390/S22114135
Abstract: The rapid development of optofluidic technologies in recent years has seen the need for sensing platforms with ease-of-use, simple s le manipulation, and high performance and sensitivity. Herein, an integrated optofluidic sensor consisting of a pillar array-based open microfluidic chip and caged dye-doped whispering gallery mode microspheres is demonstrated and shown to have potential for simple real-time monitoring of liquids. The open microfluidic chip allows for the wicking of a thin film of liquid across an open surface with subsequent evaporation-driven flow enabling continuous passive flow for s ling. The active dye-doped whispering gallery mode microspheres placed between pillars, avoid the use of cumbersome fibre tapers to couple light to the resonators as is required for passive microspheres. The performance of this integrated sensor is demonstrated using glucose solutions (0.05–0.3 g/mL) and the sensor response is shown to be dynamic and reversible. The sensor achieves a refractive index sensitivity of ~40 nm/RIU, with Q-factors of ~5 × 103 indicating a detection limit of ~3 × 10−3 RIU (~20 mg/mL glucose). Further enhancement of the detection limit is expected by increasing the microsphere Q-factor using high-index materials for the resonators, or alternatively, inducing lasing. The integrated sensors are expected to have significant potential for a host of downstream applications, particularly relating to point-of-care diagnostics.
Passive mode-locked Yb fluorozirconate glass waveguide laser
Publisher: SPIE
Date: 30-12-2019
DOI: 10.1117/12.2539789
Power scalable and efficient 790-nm pumped Tm3+-doped fiber lasers
Publisher: SPIE
Date: 09-02-2006
DOI: 10.1117/12.660932
Femtosecond laser inscribed waveguide and micro-chip laser operation at 1.07μm in Yb3+ doped germanate glass
Publisher: SPIE
Date: 30-12-2019
DOI: 10.1117/12.2539820
Fiber-Optic Skew Ray Sensors
Publisher: MDPI AG
Date: 28-04-2020
DOI: 10.3390/S20092499
Abstract: The evanescent fields along multimode fibers are usually relatively weak. To enhance the sensitivity of the resulting sensors, skew rays have been exploited for their larger number of total internal reflections and their more comprehensive spread over the fiber surface. The uniform distribution of light–matter interactions across the fiber surface facilitates high sensitivity through an increased interaction area, while mitigating the risk of laser-induced coating-material damage and photobleaching. Power-dependent measurements are less susceptible to temperature effects than interferometric techniques, and place loose requirements on the laser source. This review highlights the key developments in this area, while discussing the benefits, challenges as well as future development.
Temperature-compensated interferometric torque sensor with bi-directional coiling
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-06-2021
Review of the structural characterization, quality evaluation, and industrial application of Lycium barbarum polysaccharides
Publisher: Elsevier BV
Date: 09-2018
Toward a new sensing platform based on conducting polymer: Thickness measurement and the effect of different oxidant solution on damage threshold
Publisher: SPIE
Date: 30-12-2019
DOI: 10.1117/12.2539940
Efficient 2.9 μm fluorozirconate glass waveguide chip laser
Publisher: The Optical Society
Date: 15-07-2013
DOI: 10.1364/OL.38.002588
Multi-point optical fiber pressure sensor
Publisher: SPIE
Date: 30-12-2019
DOI: 10.1117/12.2541295
Compact fiber coupled gas sensor tunable from 3.3-4.4 μm
Publisher: Opt. Soc. America
Detection of carbon monoxide from biological tissue using difference frequency generation in periodically poled lithium niobate near 4.6 μm
Publisher: SPIE
Date: 21-04-1999
DOI: 10.1117/12.346754
Lensed GRIN Fiber-Optic Fabry-Perot Interferometers
Publisher: Optica Publishing Group
Date: 2020
Abstract: Fiber-optic Fabry-Perot interferometers developed using collimating graded-index fiber tips are shown to allow for dramatic improvements in fringe visibility of up to 10-fold for long pathlength, small FSR, cavities
Detection of formaldehyde using mid-infrared difference-frequency generation
Publisher: Springer Science and Business Media LLC
Date: 12-1997
Microstructured optical fiber high-temperature sensors
Publisher: OSA
Date: 2019
Optical Microfiber Technology for Current, Temperature, Acceleration, Acoustic, Humidity and Ultraviolet Light Sensing
Publisher: MDPI AG
Date: 28-12-2017
DOI: 10.3390/S18010072
Abstract: Optical microfibers possess excellent optical and mechanical properties that have been exploited for sensing. We highlight the authors’ recent work in the areas of current, temperature, acceleration, acoustic, humidity and ultraviolet-light sensing based on this exquisite technology, and the advantages and challenges of using optical microfibers are discussed.
Localized surface plasmons excited by skew rays
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C6D_3
Abstract: A sensing platform transforming a light sheet into skew rays then localized surface plasmon resonances is presented, enabling giant enhancement in evanescent-wave-based chemical sensing in optical fiber.
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.
Enhanced Pump Absorption of Active Fiber Components With Skew Rays
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-12-2016
Extruded fluoride fiber for 2.3μm laser application
Publisher: IEEE
Date: 08-2011
Two Micron Diode-Pumped Laser Operation of Tm,Ho:BaY2F8>
Publisher: OSA
Date: 2001
Two-dimensional mapping of surface scatterers on an optical fiber core using selective mode launching
Publisher: AIP Publishing
Date: 02-2021
DOI: 10.1063/5.0036300
Abstract: The tracking of small particles is an important but challenging task for biological applications such as disease diagnostics and medical research. Current methods are limited to the use of bulky instruments such as flow cytometers and microscopes. Here, a novel technique for the detection and measurement of micron-scale optical scatterers using a few-mode exposed-core microstructured optical fiber is proposed. Through selective mode launching combined with optical frequency domain reflectometry, scatterers located on the fiber core surface can be simultaneously mapped with both longitudinal and transverse information. This technique is demonstrated by detecting the two-dimensional positions of several femtosecond-laser-inscribed micron-scale ablations written at different locations on the fiber core surface. Due to the compact nature of the optical fiber and its local sensitivity to scatterers that are in close proximity to it, this technique has the potential for the measurement and detection of micron-scale particles in difficult to reach biological environments for in vivo applications.
85W Tm3+-doped silica fibre laser
Publisher: Institution of Engineering and Technology (IET)
Date: 2005
DOI: 10.1049/EL:20051207
Light-sheet skew-ray enhanced pump-absorption for sensing
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2019
Recent progress in advanced humidity sensors
Publisher: IOP Publishing
Date: 08-2018
Ultra-high-resolution greyscale fluorescence images via UV-exposure of thin flexible phosphor films
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2NR02931F
Abstract: High resolution greyscale fluorescence images created in thin phosphor films using UV light.
Ultrafast laser inscribed integrated photonics: Material science to device development
Publisher: EDP Sciences
Date: 2013
Highly coherent free-running dual-comb chip platform
Publisher: The Optical Society
Date: 11-04-2018
DOI: 10.1364/OL.43.001814
Gain-switched holmium-doped fibre laser
Publisher: The Optical Society
Date: 30-10-2009
DOI: 10.1364/OE.17.020872
Methane spectroscopy using a free-running chip-based dual-comb laser
Publisher: The Optical Society
Date: 29-08-2019
DOI: 10.1364/OL.44.004375
Passively Mode-Locked Depressed-Cladding Waveguide Laser in Yb Fluorozirconate Glass
Publisher: IEEE
Date: 06-2019
Single-frequency mid-infrared waveguide laser
Publisher: The Optical Society
Date: 04-11-2019
DOI: 10.1364/OE.27.033737
Negative to positive refractive index change in borosilicate BK7 glass through MHz femtosecond laser writing
Publisher: OSA
Date: 2016
Laser Based Absorption Sensors for Trace Gas Monitoring in a Spacecraft Habitat
Publisher: SAE International
Date: 12-07-1999
DOI: 10.4271/1999-01-2151
Methane sensing by a laser system incorporating difference frequency mixing and raman shifting
Publisher: IEEE
Stability of Grating-Based Optical Fiber Sensors at High Temperature
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-04-2019
Versatile fs laser-written glass chip lasers
Publisher: SPIE
Date: 06-03-2013
DOI: 10.1117/12.2012519
Ultra-fast Hygrometer based on U-shaped Optical Microfiber with Nanoporous Polyelectrolyte Coating
Publisher: Springer Science and Business Media LLC
Date: 11-08-2017
DOI: 10.1038/S41598-017-08562-1
Abstract: Real-time measurement of the relative humidity of air has applications ranging from process control to safety. By using a microfiber form-factor, we demonstrate a miniature and fast-response hygrometer with the shortest-ever response time (3 ms). The sensor head consists of an optical microfiber of 10 µm diameter and 2 mm length configured to form a compact U-shaped probe, and functionalized with a polyelectrolyte multilayer coating of 1.0 bilayer. The sensing mechanism is primarily water-absorption-based optical loss. We have measured a response time of 3 ms and a recovery time of 36 ms. The sensitivity is as high as 0.4%/%RH, and the detection limit is as low as 1.6%RH. The maximum relative humidity is 99%RH, before reaching a recoverable dew-point.
Fluorescence microscopy study on cervical intraepithelial neoplasia after topical application of 5-ALA
Publisher: OSA
Date: 1999
Laser-pumped cascaded optical parametric oscillators for watt level mid-IR generation
Publisher: SPIE
Date: 23-12-2004
DOI: 10.1117/12.579941
Ultrafast Laser Inscription in Soft Glasses: A Comparative Study of Athermal and Thermal Processing Regimes for Guided Wave Optics
Publisher: Wiley
Date: 19-11-2012
DOI: 10.1111/IJAG.12005
Fluoride glass microstructured optical fibre with large mode area and mid-infrared transmission
Publisher: IEEE
Date: 07-2008
Spectroscopic analysis and laser simulations of Yb3+/Ho3+ co-doped lead-germanate glass
Publisher: Optica Publishing Group
Date: 12-10-2020
DOI: 10.1364/OME.404375
Abstract: The potential of a Yb 3+ /Ho 3+ co-doped lead-germanate glass as a laser gain medium around 2 µm is investigated by spectroscopic measurements and rate equation modelling. The glass, based on the molar composition of 56GeO 2 -31PbO-4Ga 2 O 3 -9Na 2 O and co-doped with 1.5 mol% Yb 2 O 3 and 0.4 mol% Ho 2 O 3 , possesses a broad Ho 3+ emission spectrum covering ∼1.8 µm to 2.2 µm for the Ho 3+ : 5 I 7 → 5 I 8 transition, and a long 5 I 7 fluorescence lifetime of (7.74 ± 0.03) ms. We estimate a competitive 2 µm quantum efficiency (76%) compared to other germanate glasses. The intensity parameters are calculated to be Ω 2 = 3.0×10 −20 cm 2 , Ω 4 = 1.2×10 −20 cm 2 and Ω 6 = 2.0×10 −20 cm 2 . The energy transfer analysis from Ho 3+ to OH group represents a low Ho 3+ -OH clustering factor ( γ = 0.15) compared to phosphate and other germanate glasses. Applying these parameters to the laser model predicts 15% laser slope efficiency for cavity losses ≤ 0.5 dB using 976 nm pumping. The results show that this Yb 3+ /Ho 3+ co-doped lead-germanate glass is a promising candidate for efficient lasing around 2 µm.
Laser induced breakdown spectroscopy (LIBS) for whole rock geochemistry
Publisher: Elsevier BV
Date: 03-2023
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
Magnetic field interaction with guided light for detection of an active gaseous medium within an optical fiber
Publisher: The Optical Society
Date: 25-01-2013
DOI: 10.1364/OE.21.002491
Robust broadly tunable mid-infrared spectrometer based on difference-frequency generation for gas sensing applications
Publisher: OSA
Date: 1999
Single-peak fiber Bragg gratings in suspended-core optical fibers
Publisher: Optica Publishing Group
Date: 22-07-2020
DOI: 10.1364/OE.397537
Abstract: Femtosecond laser inscribed fiber Bragg gratings in pure-silica suspended-core optical fibers have previously been demonstrated as a promising platform for high temperature sensing. However, the density of gratings that could be written on a single fiber was limited by undesired reflections associated with higher order modes in these high numerical aperture fibers. This resulted in a complex, broadband reflection spectrum with limited multiplexing capability. In this work we utilize modifications to the fine structure of the suspended core optical fibers to fine tune the relative confinement loss of the optical fiber modes, thus reducing the contribution from such higher order modes. The effects of these changes on mode propagation are modeled, giving a range of fibers with different confinement loss properties which can be tailored to the specific length scale of a desired application. We achieve single-peak reflections from in idual fiber Bragg gratings, significantly improving performance for multipoint sensing and demonstrate this technique by writing 20 gratings onto a single fiber.
Sensitized Light Pipes: Multimode Fibers Empowered by Skew Rays
Publisher: OSA
Date: 2019
High power 2 mu m Tm3+-doped fibre lasers
Publisher: SPIE
Date: 23-12-2004
DOI: 10.1117/12.580042
A high power hybrid mid-IR laser source
Publisher: Elsevier BV
Date: 10-2010
Mode-locked chip-lasers with multiple waveguides
Publisher: SPIE
Date: 30-12-2019
DOI: 10.1117/12.2540463
A 226W hiqh power tm fibre laser
Publisher: IEEE
Date: 07-2008
Double edge-diffraction mediated virtual shadow for distance metrology
Publisher: IOP Publishing
Date: 23-10-2018
110W 790nm pumped 1908nm thulium fibre laser
Publisher: IEEE
Date: 07-2008
Graphene-based passive Q-switching of a Tm3+:ZBLAN short-infrared waveguide laser
Publisher: OSA
Date: 2014
Methane detection with a narrow-band source at 34 μm based on a Nd:YAG pump laser and a combination of stimulated Raman scattering and difference frequency mixing
Publisher: Optica Publishing Group
Date: 20-07-1996
DOI: 10.1364/AO.35.004041
High slope efficiency and high refractive index change in direct-written Yb-doped waveguide lasers with depressed claddings
Publisher: The Optical Society
Date: 12-07-2013
DOI: 10.1364/OE.21.017413
In-fiber resonantly pumped Q-switched holmium fiber laser
Publisher: Optica Publishing Group
Date: 29-10-2009
DOI: 10.1364/OL.34.003412
Er 3+ Active Yb 3+ Ce 3+ Co-Doped Fluorozirconate Guided-Wave Chip Lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2016
Supercontinuum laser illumination for NIR reflectance spectroscopy of minerals and speckle reduction
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C12B_3
Abstract: We propose a method to significantly reduce speckle originating from the intrinsic coherence of a supercontinuum laser used for reflectance spectroscopy. Rotating the s les and spectral averaging reveals the characteristic spectra of two minerals.
Fluoride glass microstructured optical fiber with large mode area and mid-infrared transmission
Publisher: Optica Publishing Group
Date: 25-11-2008
DOI: 10.1364/OL.33.002861
Abstract: We demonstrate the first fluorozirconate microstructured fiber for use in the mid-infrared. The fiber preform was manufactured via extrusion of a 200 g billet through a complex graphite die. The fiber exhibits large mode area of 6,600 microm(2), loss of 3 dB/m at 4 microm and only marginal excess loss relative to a corresponding unstructured fiber.
Multiple-watt Tm3+, Ho3+-co-doped silica fibre laser tunable across both dopant transitions
Publisher: IEEE
Date: 07-2008
Compact CH4 sensor based on difference frequency mixing of diode lasers in quasi-phasematched LiNbO3
Publisher: Elsevier BV
Date: 03-2000
DOI: 10.1016/S0030-4018(00)00485-5
Abstract: A compact, portable and robust room temperature CH4 sensor is reported. By difference frequency mixing a 500 mW alpha-DFB diode laser at 1066 nm and an erbium-doped fiber lified 1574 nm DFB diode laser in periodically poled lithium niobate up to 7 (mu)W of narrowband radiation at 3.3 microns is generated. Real-time monitoring of CH4 over a 7 day period using direct absorption in an open-path multipass cell (L = 36 m) demonstrates a detection precision of +/- 14 ppb.
A Multiple-Waveguide Mode-Locked Chip-Laser Architecture
Publisher: IEEE
Date: 06-2019
2 μm Laser Characteristics and Spectroscopic Properties of Yb3+/Ho3+ co-doped GPGN
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C3A_4
Abstract: A new Yb 3+ /Ho 3+ co-doped germanate glass is fabricated and its spectroscopic properties are investigated to present its suitability as a potential gain medium for 2 pm laser operation. Rate equations are further applied to study the 2 pm laser characteristics of the glass pumped at 976 nm. The simulation shows that 15 % laser slope efficiency can be achieved at 2050 nm by reducing the intracavity losses below 0.5 dB.
Engineering development of a directed IR countermeasure laser
Publisher: SPIE
Date: 29-12-2004
DOI: 10.1117/12.579933
<title>Compact mid-infrared trace gas sensor based on difference frequency mixing</title>
Publisher: SPIE
Date: 25-10-1999
DOI: 10.1117/12.366449
Ultrafast laser inscribed 3D integrated photonics
Publisher: SPIE
Date: 19-12-2027
DOI: 10.1117/12.2025535
New Materials and Structures: Expanding the Properties of Optical Fibres
Publisher: OSA
Date: 2014
Compact, all-fibre, linearly polarized, single-mode Ytterbium doped fibre laser utilizing point-by-point inscribed intra-core fibre Bragg gratings
Publisher: SPIE
Date: 21-12-2007
DOI: 10.1117/12.759300
Widely tunable short-infrared thulium and holmium doped fluorozirconate waveguide chip lasers
Publisher: The Optical Society
Date: 09-10-2014
DOI: 10.1364/OE.22.025286
Development of an automated diode-laser-based multicomponent gas sensor
Publisher: Optica Publishing Group
Date: 20-08-2000
DOI: 10.1364/AO.39.004444
Abstract: The implementation and application of a portable fiber-coupled trace-gas sensor for the detection of several trace gases, including CO2, CH4, and H2CO, are reported. This particular sensor is based on a cw fiber- lified near-infrared (distributed Bragg reflector) diode laser and an external cavity diode laser that are frequency converted in a periodically poled lithium niobate crystal to the mid-IR spectroscopic fingerprint region (3.3-4.4 micrometers). A continuous absorption spectrum of CH4 and H2CO from 3.37 to 3.10 micrometers with a spectral resolution of 40 MHz (approximately 0.0013 cm-1) demonstrated the spectral performance that can be achieved by means of automated wavelength tuning and phase matching with stepper motor control. Autonomous long-term detection of ambient CO2 and CH4 over a 3- and 7-day period was also demonstrated.
An Overview of External-Cavity Diode Lasers for use in Spectroscopy and WDM applications
Publisher: OSA
Date: 1999
DOI: 10.1364/ASLA.1999.40
Ultrafast colorimetric humidity-sensitive polyelectrolyte coating for touchless control
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6MH00317F
Abstract: A touchless control system that can be operated by a humidity signal is developed based on colorimetric humidity-sensitive materials.
A pulsed laser source using stimulated Raman scattering and difference frequency mixing: Remote sensing of methane in air
Publisher: Elsevier BV
Date: 11-1995
Guided-mode based Faraday rotation spectroscopy within a photonic bandgap fiber
Publisher: SPIE
Date: 21-02-2013
DOI: 10.1117/12.2003944
Force Sensors based on Skew-ray-probed Optical Fibers
Publisher: OSA
Date: 2018
Efficient coupling between single mode fibers and glass chip waveguides via graded refractive index fiber tips
Publisher: Optica Publishing Group
Date: 28-03-2022
DOI: 10.1364/OE.452945
Abstract: Coupling characteristics between a single mode fiber (SMF) and a waveguide embedded in a glass chip via a graded index fiber (GIF) tip are investigated at a wavelength of 976 nm. The GIF tips comprise a coreless fiber section and a GIF section. A depressed cladding waveguide in a ZBLAN glass chip with a core diameter of 35 μm is coupled with GIF tips that have a range of coreless fiber and GIF lengths. An experimental coupling efficiency as high as 88% is obtained while a numerical simulation predicts 92.9% for the same GIF tip configuration. Since it is measured in the presence of Fresnel reflection, it can be further improved by anti-reflection coating. Additionally, it is demonstrated that a gap can be introduced between the chip waveguide and the GIF tip while maintaining the high coupling efficiency, thus allowing a thin planar optical component to be inserted. The results presented here will enable miniaturization and simplification of photonic chips with integrated waveguides by replacing bulk coupling lenses with integrated optical fibers.
Photodetector with photothermal cascaded Fabry-Perot etalons
Publisher: SPIE
Date: 23-04-2017
DOI: 10.1117/12.2263428
Portable fiber-coupled diode-laser-based sensor for multiple trace gas detection
Publisher: Springer Science and Business Media LLC
Date: 12-1999
Abstract: Tunable narrowband mid-infrared radiation from 3.25 to 4.4 micrometers is generated by a compact fiber-coupled, difference-frequency-based spectroscopic source. A 20-mW external cavity diode laser (with a tuning range from 814 to 870 nm) and a 50-mW distributed-Bragg-reflector diode-laser-seeded ytterbium-doped fiber lifier operating at 1083 nm are difference-frequency mixed in a multi-grating, temperature-controlled periodically poled LiNbO3 crystal. A conversion efficiency of 0.44 mW/(W2cm) (corresponding to a power of approximately equal to 3 microW at 3.3 micrometers) represents the highest conversion efficiency reported for a portable device. Performance characteristics of such a sensor and its application to spectroscopic detection of CO2, N2O, H2CO, HCl, NO2, and CH4 will be reported in this work.
Measuring the Radial Position of Defects within Optical Fibers Using Skew Rays
Publisher: Hindawi Limited
Date: 2017
DOI: 10.1155/2017/4879528
Abstract: Defects within optical fibers can cause premature failure in fiber-based systems and must be detected early to avoid performance degradation. Addressing this need can ensure that no defective optical fibers are being used by end users and improve processes to reduce the number of defects during manufacturing. The main challenge to date has been developing a technique that can measure defects along long lengths of fiber, within opaque packaging, and with position information. We demonstrate a simple and novel technique for detecting and radially resolving microscopic defects in packaged/buried fibers using an angle-resolved interrogator that analyzes the transmission of different ray groups. We have measured the accuracy to be as low as ±2 μ m, which is sufficient for most fibers that have diameters in the order of ~100 μ m.
Broadband Dual-Comb Spectroscopy of Methane with a Free-Running Erbium Chip Laser
Publisher: IEEE
Date: 06-2019
Radial position measurement of defects within optical fibers using skew rays interrogation
Publisher: IEEE
Date: 07-2017
Holmium-doped 2.1 μm waveguide chip laser with an output power > 1 W
Publisher: The Optical Society
Date: 10-12-2015
DOI: 10.1364/OE.23.032664
Optical hygrometer using light-sheet skew-ray probed multimode fiber with polyelectrolyte coating
Publisher: Elsevier BV
Date: 10-2019
Fiber Lasers that Bridge the Shortwave to Midwave Regions of the Infrared Spectrum
Publisher: Wiley
Date: 18-07-2012
Detection of microscopic defects in optical fiber coatings using angle-resolved skew rays
Publisher: The Optical Society
Date: 25-08-2016
DOI: 10.1364/OL.41.004036
Photodetector based on Vernier-Enhanced Fabry-Perot Interferometers with a Photo-Thermal Coating
Publisher: Springer Science and Business Media LLC
Date: 31-01-2017
DOI: 10.1038/SREP41895
Abstract: We present a new type of fiber-coupled photodetector with a thermal-based optical sensor head, which enables it to operate even in the presence of strong electro-magnetic interference and in electrically sensitive environments. The optical sensor head consists of three cascaded Fabry-Perot interferometers. The end-face surface is coated with copper-oxide micro-particles embedded in hydrogel, which is a new photo-thermal coating that can be readily coated on many different surfaces. Under irradiation, photons are absorbed by the photo-thermal coating, and are converted into heat, changing the optical path length of the probing light and induces a resonant wavelength shift. For white-light irradiation, the photodetector exhibits a power sensitivity of 760 pm/mW, a power detection limit of 16.4 μW (i.e. specific detectivity of 2.2 × 10 5 cm.√Hz/W), and an optical damage threshold of ~100 mW or ~800 mW/cm 2 . The response and recovery times are 3.0 s (~90% of change within 100 ms) and 16.0 s respectively.
Femtosecond laser induced low propagation loss waveguides in a lead-germanate glass for efficient lasing in near to mid-IR
Publisher: Springer Science and Business Media LLC
Date: 24-05-2021
DOI: 10.1038/S41598-021-90249-9
Abstract: To support the growing landscape of near to mid-IR laser applications we demonstrate a range of low propagation loss femtosecond laser (FSL) written waveguides (WGs) that have achieved guided-mode laser operation in a rare earth (RE) doped lead-germanate glass. The WGs are fabricated in both the athermal and thermal FSL writing regimes using three different pulse repetition frequencies (PRF): 100 kHz (athermal) 1 MHz and 5 MHz (thermal). The lasing capability of Yb 3+ doped lead-germanate waveguides is verified in the near-IR. The refractive index contrast (∆n) for 100 kHz WGs is ~ 1 × 10 –4 , while for 5 MHz, ∆n increases to ~ 5 × 10 –4 . The WGs in the thermal regime are less effected by self-focusing and are larger in dimensions with reduced propagation losses. For the 1 MHz repetition rate thermal writing regime we report a low propagation loss WG (0.2 dB/cm) and demonstrate laser operation with slope efficiencies of up to ~ 28%.
A 4W tunable Tm3+:Ho3+ silica fibre laser
Publisher: IEEE
Date: 05-2008
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
High-power continuous-wave mid-infrared radiation generated by difference frequency mixing of diode-laser-seeded fiber amplifiers and its application to dual-beam spectroscopy
Publisher: Optica Publishing Group
Date: 12-1999
DOI: 10.1364/OL.24.001744
Abstract: We report the generation of up to 0.7 mW of narrow-linewidth (<60-MHz) radiation at 3.3 micrometers by difference frequency mixing of a Nd:YAG-seeded 1.6-W Yb fiber lifier and a 1.5-micrometers diode-laser-seeded 0.6-W Er/Yb fiber lifier in periodically poled LiNbO3. A conversion efficiency of 0.09%/W (0.47 mWW-2 cm-1) was achieved. A room-air CH4 spectrum acquired with a compact 80-m multipass cell and a dual-beam spectroscopic configuration indicates an absorption sensitivity of +/-2.8 x 10(-5) (+/-1 sigma), corresponding to a sub-parts-in-10(9) (ppb) CH4 sensitivity (0.8 ppb).
High Temperature Stability of Femtosecond Written Ablation Fiber Bragg Gratings in Microstructured Optical Fibers
Publisher: IEEE
Date: 10-2018
Synchronised dual-wavelength mode-locking in waveguide lasers
Publisher: Springer Science and Business Media LLC
Date: 18-05-2018
DOI: 10.1038/S41598-018-26152-7
Abstract: We present a novel approach to study continuous-wave mode-locking in a waveguide laser in the presence of a gain profile with complex features. We introduce a new simulation approach where we separate the role of gain, nonlinearity, dispersion and saturable absorption elements to provide a better understanding of the interplay between these elements. In particular, we use the simulation to explain synchronised dual-wavelength mode-locking. The results show that despite the existence of dispersion which tends to form separate pulse trains in the laser cavity, the saturable absorber plays a critical role in keeping the different wavelength components synchronised. This work, for the first time, provides insight into existing experimental results. It also demonstrates new methods for studying lasers, especially mode-locking laser, with short laser cavities.
CO-detection from biological tissues using a mid-infrared laser based gas sensor
Publisher: OSA
Date: 1999
Skew rays analysis to determine radial position of defects within optical fibers
Publisher: SPIE
Date: 23-04-2017
DOI: 10.1117/12.2263419
Gold-Decorated Porous Silicon Nanopillars for Targeted Hyperthermal Treatment of Bacterial Infections
Publisher: American Chemical Society (ACS)
Date: 25-09-2017
Abstract: In order to address the issue of pathogenic bacterial colonization of diabetic wounds, a more direct and robust approach is required, which relies on a physical form of bacterial destruction in addition to the conventional biochemical approach (i.e., antibiotics). Targeted bacterial destruction through the use of photothermally active nanomaterials has recently come into the spotlight as a viable approach to solving the rising problem of antibiotic resistant microorganisms. Materials with high absorption coefficients in the near-infrared (NIR) region of the electromagnetic spectrum show promise as alternative antibacterial therapeutic agents, since they preclude the development of bacterial resistance and can be activated on demand. Here were report on a novel approach for the fabrication of gold nanoparticle decorated porous silicon nanopillars with tunable geometry that demonstrate excellent photothermal conversion properties when irradiated with a 808 nm laser. These photothermal antibacterial properties are demonstrated in vitro against the Gram-positive bacteria Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli). Results show a reduction in bacterial viability of up to 99% after 10 min of laser irradiation. We also show an increase in antibacterial performance after modifying the nanopillars with S. aureus targeting antibodies causing up to a 10-fold increase in bactericidal efficiency compared to E. coli. In contrast, the nanomaterial resulted in minimal disruption of metabolic processes in human foreskin fibroblasts (HFF) after an equivalent period of irradiation.
Angle-Resolved Skew Rays for Microscopic Fault Detection in Optical Fiber Coatings
Publisher: OSA
Date: 2016
Integrated waveguide lasers
Publisher: IEEE
Date: 06-2011
Married Men and Vasectomy: A Focused Group Study in an Urban Community in Ghana
Publisher: SAGE Publications
Date: 2018
Abstract: An effective method of birth control in men yet least accepted and patronized is vasectomy. Vasectomy provides health benefits to the user, his direct family, and the entire population as it helps to control population growth. This article explored the beliefs and attitudes of commercial drivers on vasectomy in an urban community in Ghana. The study employed qualitative exploratory design using focus group discussion. Data were collected from 12 married men between the ages of 45 to 60 years who were selected through purposive s ling method. The focus group discussions were audiotaped, handwritten, and recorded. Recorded data were then transcribed verbatim, and the current version of the NVivo software for analyzing qualitative data was used to manage the data. Three major themes emerged from the study: knowledge of respondents on vasectomy, beliefs, and attitudes of married men toward vasectomy. Each of the themes had three subthemes. The study revealed that vasectomy was perceived by some of the respondents to be synonymous to castration which comes with negative effects. Inadequate knowledge, negative perceptions, future uncertainty, and the irreversible nature of vasectomy emerged as contributing to the low patronage and some of the reasons why most of the respondents had no intentions of opting for vasectomy. In view of these findings, it is imperative for all stakeholders to give urgent attention to behavior change strategies that can be put in action to ameliorate the effects of these negative attitudes and misbeliefs. Ultimately, the tide can be turned around and vasectomy will be a preferred alternative when it comes to family planning in Ghana.
Light-Sheet Skew Ray-Enhanced Localized Surface Plasmon Resonance-Based Chemical Sensing
Publisher: American Chemical Society (ACS)
Date: 09-12-2020
DOI: 10.1021/ACSSENSORS.9B01897
Abstract: A stronger absorption of pump robe light is desirable for maximizing the sensitivity to enable accurate measurements of trace chemical elements. We introduce a new sensing technique built on light-sheet excitation of skew rays in a multimode fiber with an additional enhancement of localized surface plasmon resonance (LSPR) and its evanescent-field hotspots between gold nanospheres on the coated fiber. A skewed light-sheet (i.e., a thin plane of light) can exploit the optimum ray group, producing enhanced and uniform interactions between light and matter for higher absorption/sensitivity and higher power threshold. The heightened evanescent field couples to the localized surface plasmon resonant modes to attain even greater sensitivity. We compared this excitation method with the previously demonstrated light-sheet skew ray-based sensor without LSPR and observed an enhancement in normalized attenuation of pump light up to seven orders of magnitude for low-concentration rhodamine B. The improvement in the normalized detection limit is almost three orders of magnitude. This new sensing technique uses a functionalized fiber rather than pairing a passive fiber with added functional particles in the analyte, which offers better area-selectivity. The potentially low-cost chemical sensors can be used on a range of sensing mechanisms such as pump robe light absorption.
In-fibre resonant pumping of a fibre laser
Publisher: IEEE
Date: 07-2008
Microchip and ultra-fast laser inscribed waveguide lasers in Yb3+germanate glass
Publisher: The Optical Society
Date: 08-2019
DOI: 10.1364/OME.9.003557
Force Sensors Using the Skew-Ray-Probed Plastic Optical Fibers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2018
Femtosecond-laser-written Microstructured Waveguides in BK7 Glass
Publisher: Springer Science and Business Media LLC
Date: 10-07-2018
DOI: 10.1038/S41598-018-28631-3
Abstract: There is a deficiency of low-loss microstructured waveguides that can be fabricated with a single laser-pass to minimize stress build-up, which can enable enhanced functionality and higher compactness for integrated optical devices. We demonstrate, for the first time, a series of multi-ring claddings each with a pair of cores in BK7 glass. Each waveguide was fabricated using only a single laser-pass at 1 MHz pulse repetition rate, 5 mm/s translation speed, 250 fs pulse width, over a set of pulse energies. We obtained the lowest-reported propagation loss of 0.062 dB/cm, measured at 1155 nm wavelength from the waveguide written with 340 nJ pulse energy. The maximum observed numerical aperture is 0.020, measured at 1155 nm wavelength from the waveguide written with 620 nJ pulse energy. Such waveguides could be incorporated in integrated Raman laser platforms for biomedical applications.
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