ORCID Profile
0000-0002-5606-3874
Current Organisations
The Hong Kong Polytechnic University
,
Hong Kong Polytechnic University
,
University of Sydney
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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)
Astronomical and Space Instrumentation | Astronomical and Space Sciences | Photonics, Optoelectronics and Optical Communications | Cosmology and Extragalactic Astronomy | Photogrammetry and Remote Sensing | Optical Physics | Aerospace Engineering | Satellite, Space Vehicle and Missile Design and Testing | Polymers | Stellar Astronomy and Planetary Systems | Optical Physics Not Elsewhere Classified | Quantum Optics And Lasers
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Technology | Polymeric materials (e.g. paints) | Aerospace Equipment | Expanding Knowledge in the Environmental Sciences | Scientific Instruments | Physical sciences | Scientific instrumentation | Food Safety |
Related Links
Publications
Measurements of few-mode fiber photonic lanterns in emulated atmospheric conditions for a low earth orbit space to ground optical communication receiver application
Publisher: SPIE
Date: 02-03-2020
DOI: 10.1117/12.2542848
Post-inscription tuning of multicore fiber Bragg gratings
Publisher: SPIE
Date: 22-07-2016
DOI: 10.1117/12.2234245
Astrophotonics: molding the flow of light in astronomical instruments [Invited]
Publisher: The Optical Society
Date: 23-06-2017
DOI: 10.1364/OE.25.015549
Photonic lanterns: a study of light propagation in multimode to single-mode converters
Publisher: Optica Publishing Group
Date: 07-04-2010
DOI: 10.1364/OE.18.008430
Long-distance fiber-optic propagation of deterministically-shaped single photons
Publisher: OSA
Date: 2018
Geometric requirements for photonic lanterns in space division multiplexing
Publisher: The Optical Society
Date: 16-11-2012
DOI: 10.1364/OE.20.027123
Optical fibre tapers: focal reduction and magnification
Publisher: SPIE
Date: 13-09-2012
DOI: 10.1117/12.925404
Supercontinuum generation system for optical coherence tomography based on tapered photonic crystal fibre
Publisher: Optica Publishing Group
Date: 2006
DOI: 10.1364/OE.14.001596
Abstract: We report smooth and broad continuum generation using a compact femtosecond Ti:Sapphire laser as a pump source and a tapered photonic crystal fibre as a nonlinear element. Spectral output is optimized for use in optical coherence tomography, providing a maximum longitudinal resolution of 1.5 microm in free space at 809 nm centre wavelength without use of additional spectral filtering.
Writing bragg gratings in multicore fibers
Publisher: MyJove Corporation
Date: 20-04-2016
DOI: 10.3791/53326
New-generation hexabundles: Development and initial results
Publisher: SPIE
Date: 10-07-2018
DOI: 10.1117/12.2313033
Low-loss deposition of solgel-derived silica films on tapered fibers
Publisher: Optica Publishing Group
Date: 04-2004
DOI: 10.1364/OL.29.000694
Abstract: Films of porous silica are deposited on the uniform waists of tapered fibers in minutes by a modified solgel dip coating method, inducing less than 0.2 dB of loss. The coated tapers are an ideal platform for realizing all-fiber devices that exploit evanescent-field interactions with the deposited porous film. As an ex le we demonstrate structural long-period gratings in which a periodic index variation in the film arises from the porosity variation produced by spatially varying exposure of the waist to a scanned CO2 laser beam. The long period grating is insensitive to temperature up to 800 degrees C.
Introduction to the JSTQE Special Issue on Emerging Applications of Multimode, Multicore and Specialty Fibers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2020
THz propagation in kagome hollow-core microstructured fibers
Publisher: The Optical Society
Date: 06-09-2011
DOI: 10.1364/OE.19.018470
Characterization of hexabundles: initial results
Publisher: Oxford University Press (OUP)
Date: 30-05-2011
Multicore fibre technology: The road to multimode photonics
Publisher: SPIE
Date: 22-07-2016
DOI: 10.1117/12.2231924
Evolution of soliton behavior in adiabatically tapered photonic crystal fiber
Publisher: IEEE
Date: 2006
Gnosis: The first instrument to use fiber bragg gratings for oh suppression
Publisher: American Astronomical Society
Date: 16-01-2013
Annular Core Photonic Lantern OAM Mode Multiplexer
Publisher: OSA
Date: 2017
Hexabundles - imaging fibre bundles for astronomy
Publisher: IEEE
Date: 05-2011
Air-structured optical fibre drawn from a 3D-printed perform
Publisher: SPIE
Date: 28-09-2015
DOI: 10.1117/12.2195466
GNOSIS: An OH suppressing near-infrared spectrograph for astronomy using fibre Bragg gratings
Publisher: IEEE
Date: 05-2011
Optimal broadband starlight injection into a single-mode fibre with integrated photonic wavefront sensing
Publisher: Optica Publishing Group
Date: 08-09-2022
DOI: 10.1364/OE.465639
Abstract: In astronomy and related fields there is a pressing need to efficiently inject light, transmitted through the atmosphere, into a single-mode fibre. However this is extremely difficult due to the large, rapidly changing aberrations imprinted on the light by the turbulent atmosphere. An adaptive optics system must be used, but its effectiveness is limited by non-common-path aberrations and insensitivity to certain crucial modes. Here we introduce a new concept device - the hybrid mode-selective photonic lantern - which incorporates both focal plane wavefront sensing and broadband single-mode fibre injection into a single photonic package. The fundamental mode of an input multimode fibre is directly mapped over a broad (1.5 to 1.8 μ m) bandwidth to a single-mode output fibre with minimal ( .1%) crosstalk, while all higher order modes are sent to a fast detector or spectrograph for wavefront sensing. This will enable an AO system optimised for maximum single-mode injection, sensitive to otherwise ‘blind’ modes and avoiding non-common-path wavefront-sensor aberrations.
General coupling efficiency for fiber-fed astronomical instruments
Publisher: Optica Publishing Group
Date: 17-06-2021
DOI: 10.1364/JOSAB.423905
Abstract: Photonic devices (e.g., optical fibers, 2D waveguides) are commonly used on telescopes worldwide and have been hugely successful in terms of their scientific impact. Coupling light efficiently into photonic devices is critical because most astronomical sources generate low photon count rates at the detector, even when coupled to large telescope apertures. Recent developments in adaptive optics have helped to improve the coupling to optical fibers, although efficient coupling to single-mode fibers remains a challenge. We appraise the theoretical limits to this coupling efficiency in both diffraction limited and seeing limited conditions, and we review methods to improve coupling efficiency with a view to recent advances in astrophotonics.
Error free 9.5 Gb/s transmission over 50 m of multimode microstructured polymer optical fibre
Publisher: IEEE
Date: 08-2011
Suppression of the near-infrared OH night-sky lines with fibre Bragg gratings - first results
Publisher: Oxford University Press (OUP)
Date: 17-08-2012
Residual pump peak removal for ultra-flattened supercontinuum generation by photonic crystal fibers
Publisher: IEEE
Date: 2006
The SAMI Galaxy Survey: instrument specification and target selection
Publisher: Oxford University Press (OUP)
Date: 13-01-2015
Photonic lantern mode evolution: A multicore geometry study
Publisher: IEEE
Date: 12-2010
OAM interferometry: the detection of the rotational Doppler shift
Publisher: The Optical Society
Date: 22-08-2017
DOI: 10.1364/OE.25.021159
OpenHSI: A Complete Open-Source Hyperspectral Imaging Solution for Everyone
Publisher: MDPI AG
Date: 07-05-2022
DOI: 10.3390/RS14092244
Abstract: OpenHSI is an initiative to lower the barriers of entry and bring compact pushbroom hyperspectral imaging spectrometers to a wider audience. We present an open-source optical design that can be replicated with readily available commercial-off-the-shelf components, and an open-source software platform openhsi that simplifies the process of capturing calibrated hyperspectral datacubes. Some of the features that the software stack provides include: an ISO 19115-2 metadata editor, wavelength calibration, a fast smile correction method, radiance conversion, atmospheric correction using 6SV (an open-source radiative transfer code), and empirical line calibration. A pipeline was developed to customise the desired processing and make openhsi practical for real-time use. We used the OpenHSI optical design and software stack successfully in the field and verified the performance using calibration tarpaulins. By providing all the tools needed to collect documented hyperspectral datasets, our work empowers practitioners who may not have the financial or technical capability to operate commercial hyperspectral imagers, and opens the door for applications in new problem domains.
Wavelength-selective switch with direct few mode fiber integration
Publisher: The Optical Society
Date: 24-02-2015
DOI: 10.1364/OE.23.005723
Re-Building Students’ Post-COVID-19 Confidence in Courses, Curriculum and Careers for Tourism, Hospitality, and Events
Publisher: Informa UK Limited
Date: 07-09-2021
The Photonic TIGER: A multicore fiber-fed spectrograph
Publisher: SPIE
Date: 13-09-2012
DOI: 10.1117/12.925254
BASIS: Bayfordbury single-object integral field spectrograph
Publisher: SPIE
Date: 24-09-2012
DOI: 10.1117/12.925378
Guidance properties of low-contrast photonic bandgap fibres
Publisher: Optica Publishing Group
Date: 2005
Abstract: We investigate the guidance properties of low-contrast photonic band gap fibres. As predicted by the antiresonant reflecting optical waveguide (ARROW) picture, band gaps were observed between wavelengths where modes of the high-index rods in the cladding are cutoff. At these wavelengths, leakage from the core by coupling to higher-order modes of the rods was observed directly. The low index contrast allowed for bend loss to be investigated unlike in index-guiding fibres, anomalous "centripetal" light leakage through the inside of the bend can occur.
Atmospheric OH suppression with GNOSIS at the Anglo-Australian telescope
Publisher: IEEE
Date: 08-2011
A Multi-Core Fibre Photonic Lantern-Based Spectrograph for Raman Spectroscopy
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2020
Focal-plane wavefront sensing with photonic lanterns: theoretical framework
Publisher: Optica Publishing Group
Date: 14-09-2022
DOI: 10.1364/JOSAB.466227
Abstract: The photonic lantern (PL) is a tapered waveguide that can efficiently couple light into multiple single-mode optical fibers. Such devices are currently being considered for a number of tasks, including the coupling of telescopes and high-resolution, fiber-fed spectrometers, coherent detection, nulling interferometry, and vortex-fiber nulling. In conjunction with these use cases, PLs can simultaneously perform low-order focal-plane wavefront sensing. In this work, we provide a mathematical framework for the analysis of a PL wavefront sensor (PLWFS), deriving linear and higher-order reconstruction models as well as metrics through which sensing performance—in both the linear and nonlinear regimes—can be quantified. This framework can be extended to account for additional optics such as beam-shaping optics and vortex masks, and can be generalized for other wavefront sensing architectures. Finally, we provide initial numerical verification of our mathematical models by simulating a six-port PLWFS. In a forthcoming companion paper (Lin and Fitzgerald), we provide a more comprehensive numerical characterization of few-port PLWFSs, and consider how the sensing properties of these devices can be controlled and optimized.
NanoSpec: A diffraction limited micro-spectrograph for pico- and nano-satellites
Publisher: SPIE
Date: 22-08-2012
DOI: 10.1117/12.925819
PRAXIS: An OH suppression optimised near infrared spectrograph
Publisher: SPIE
Date: 06-07-2018
DOI: 10.1117/12.2311898
Scalable photonic-based nulling interferometry with the dispersed multi-baseline GLINT instrument
Publisher: Springer Science and Business Media LLC
Date: 29-04-2021
DOI: 10.1038/S41467-021-22769-X
Abstract: Characterisation of exoplanets is key to understanding their formation, composition and potential for life. Nulling interferometry, combined with extreme adaptive optics, is among the most promising techniques to advance this goal. We present an integrated-optic nuller whose design is directly scalable to future science-ready interferometric nullers: the Guided-Light Interferometric Nulling Technology, deployed at the Subaru Telescope. It combines four beams and delivers spatial and spectral information. We demonstrate the capability of the instrument, achieving a null depth better than 10 −3 with a precision of 10 −4 for all baselines, in laboratory conditions with simulated seeing applied. On sky, the instrument delivered angular diameter measurements of stars that were 2.5 times smaller than the diffraction limit of the telescope. These successes pave the way for future design enhancements: scaling to more baselines, improved photonic component and handling low-order atmospheric aberration within the instrument, all of which will contribute to enhance sensitivity and precision.
Photonic lanterns
Publisher: Walter de Gruyter GmbH
Date: 16-12-2013
Abstract: Multimode optical fibers have been primarily (and almost solely) used as “light pipes” in short distance telecommunications and in remote and astronomical spectroscopy. The modal properties of the multimode waveguides are rarely exploited and mostly discussed in the context of guiding light. Until recently, most photonic applications in the applied sciences have arisen from developments in telecommunications. However, the photonic lantern is one of several devices that arose to solve problems in astrophotonics and space photonics. Interestingly, these devices are now being explored for use in telecommunications and are likely to find commercial use in the next few years, particularly in the development of compact spectrographs. Photonic lanterns allow for a low-loss transformation of a multimode waveguide into a discrete number of single-mode waveguides and vice versa, thus enabling the use of single-mode photonic technologies in multimode systems. In this review, we will discuss the theory and function of the photonic lantern, along with several different variants of the technology. We will also discuss some of its applications in more detail. Furthermore, we foreshadow future applications of this technology to the field of nanophotonics.
Hole inflation and tapering of stock photonic crystal fibres
Publisher: Optica Publishing Group
Date: 2005
Abstract: We report controlled hole expansion in photonic crystal fibres (PCFs) by heating the fibre while the holes were pressurised. This was done by post-processing an existing fibre, not during fibre fabrication. Small holes in an endlessly single-mode (ESM) PCF were inflated to become large holes. The large-hole PCF was then tapered to produce a "cobweb" PCF with a small highly-nonlinear core, interfaced to the ESM PCF at both ends by gradual transitions. The loss was less than 0.4 dB in the complete structure, which was used to demonstrate supercontinuum generation when pumped with a fs Ti:sapphire laser.
A Study of Power Distributions in Photonic Lantern for Coherent Optical Receiver
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2019
Spatial mode sorter coronagraphs
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.C6G_3
Abstract: We discuss the use of spatial mode sorters as coronagraphs capable of operating near the fundamental limits at small inner working angles.
The photonic lantern
Publisher: The Optical Society
Date: 13-04-2015
DOI: 10.1364/AOP.7.000107
Mode-selective photonic lanterns for space-division multiplexing
Publisher: The Optical Society
Date: 10-01-2014
DOI: 10.1364/OE.22.001036
Multimode Photonics: Harnessing Optical Transition Devices
Publisher: IEEE
Date: 09-2015
CUAVA InGaAs-based, Short Wavelength InfraRed (SWIR) instrument for atmospheric reconnaissance: preliminary design
Publisher: SPIE
Date: 11-06-2021
DOI: 10.1117/12.2600239
Development and focal ratio degradation optimisation of integral field units on Hector
Publisher: SPIE
Date: 09-09-2019
DOI: 10.1117/12.2529212
Scaling photonic lanterns for space-division multiplexing
Publisher: Springer Science and Business Media LLC
Date: 11-06-2018
DOI: 10.1038/S41598-018-27072-2
Abstract: We present a new technique allowing the fabrication of large modal count photonic lanterns for space- ision multiplexing applications. We demonstrate mode-selective photonic lanterns supporting 10 and 15 spatial channels by using graded-index fibres and microstructured templates. These templates are a versatile approach to position the graded-index fibres in the required geometry for efficient mode s ling and conversion. Thus, providing an effective scalable method for large number of spatial modes in a repeatable manner. Further, we demonstrate the efficiency and functionality of our photonic lanterns for optical communications. Our results show low insertion and mode dependent losses, as well as enhanced mode selectivity when spliced to few mode transmission fibres. These photonic lantern mode multiplexers are an enabling technology for future ultra-high capacity optical transmission systems.
Multipole method for microstructured optical fibers. I. Formulation
Publisher: Optica Publishing Group
Date: 10-2002
Multicore composite single-mode polymer fiber
Publisher: The Optical Society
Date: 19-12-2011
DOI: 10.1364/OE.20.000141
3D optical trapping inside a hollow-core microstructured optical fiber
Publisher: OSA
Date: 2010
Emission properties of quantum dots in polymer optical fibres
Publisher: Optica Publishing Group
Date: 09-11-2009
DOI: 10.1364/OE.17.021344
Demonstration and design of a compact diffraction limited spectrograph
Publisher: SPIE
Date: 24-09-2012
DOI: 10.1117/12.925824
The INSPIRE-2 CubeSat for the QB50 Project
Publisher: Springer Science and Business Media LLC
Date: 26-03-2020
LP01 to TE01 fibre mode convertor
Publisher: IEEE
Date: 06-2007
What does the Industry need to know about Chinese Hospitality Leadership?
Publisher: Informa UK Limited
Date: 03-04-2018
Polymer optical fibres: conventional and microstructured fibres
Publisher: SPIE
Date: 09-02-2012
DOI: 10.1117/12.916068
Low Loss and Temperature Stable Microstructured Polymer Optical Fibers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2012
The i-INSPIRE Satellite - A university pico-satellite project
Publisher: SPIE
Date: 22-08-2012
DOI: 10.1117/12.925709
Photonic Lantern: harnessing multimode photonics for optical communications
Publisher: OSA
Date: 2017
Demonstration of uniform multicore fiber Bragg gratings
Publisher: The Optical Society
Date: 12-12-2014
DOI: 10.1364/OE.22.031575
Mode-selective dissimilar fiber photonic-lantern spatial multiplexers for few-mode fiber
Publisher: Institution of Engineering and Technology
Date: 2013
DOI: 10.1049/CP.2013.1680
Wavelength-selective Switch for Few-mode Fiber Transmission
Publisher: Institution of Engineering and Technology
Date: 2013
DOI: 10.1049/CP.2013.1681
PRAXIS: A near infrared spectrograph optimised for OH suppression
Publisher: SPIE
Date: 09-08-2016
DOI: 10.1117/12.2232115
Low-loss anamorphic transitions to high-aspect-ratio fibre cores
Publisher: IEEE
Date: 2006
GNOSIS: A novel near-infrared OH suppression unit at the AAT
Publisher: SPIE
Date: 24-09-2012
DOI: 10.1117/12.926483
GNOSIS: An OH suppression unit for near-infrared spectrographs
Publisher: SPIE
Date: 16-07-2010
DOI: 10.1117/12.856348
PIMMS: Photonic integrated multimode microspectrograph
Publisher: SPIE
Date: 16-07-2010
DOI: 10.1117/12.856347
Multi-core fiber Bragg grating developments for OH suppression
Publisher: SPIE
Date: 13-09-2012
DOI: 10.1117/12.925791
The SAMI Galaxy Survey: Data Release One with emission-line physics value-added products
Publisher: Oxford University Press (OUP)
Date: 11-12-2017
Photonic bandgap with an index step of one percent
Publisher: Optica Publishing Group
Date: 2005
Abstract: Early work suggested that very large refractive index contrasts would be needed to create photonic bandgaps in two or three dimensionally periodic photonic crystals. It was then shown that in two-dimensionally periodic structures (such as photonic crystal fibres) a non-zero wavevector component in the axial direction permits photonic bandgaps for much smaller index contrasts. Here we experimentally demonstrate a photonic bandgap fibre made from two glasses with a relative index step of only 1%.
Liquid-crystal-based in-fiber tunable spectral structures
Publisher: SPIE-Intl Soc Optical Eng
Date: 03-2006
DOI: 10.1117/1.2181847
An innovative integral field unit upgrade with 3D-printed micro-lenses for the RHEA at Subaru
Publisher: SPIE
Date: 13-12-2020
DOI: 10.1117/12.2560626
Strain sensing using long period gratings in microstructured polymer optical fibres
Publisher: SPIE
Date: 15-05-2011
DOI: 10.1117/12.885672
Deterministic transverse mode conversion at the single-photon level
Publisher: OSA
Date: 2017
Performance of a Novel PMMA Polymer Imaging Bundle for Field Acquisition and Wavefront Sensing
Publisher: Cambridge University Press (CUP)
Date: 2017
DOI: 10.1017/PASA.2017.1
Abstract: Imaging bundles provide a convenient way to translate a spatially coherent image, yet conventional imaging bundles made from silica fibre optics typically remain expensive with large losses due to poor filling factors (~40%). We present the characterisation of a novel polymer imaging bundle made from poly(methyl methacrylate) (PMMA) that is considerably cheaper and a better alternative to silica imaging bundles over short distances (~1 m from the middle to the edge of a telescope’s focal plane). The large increase in filling factor (92% for the polymer imaging bundle) outweighs the large increase in optical attenuation from using PMMA (1 dB/m) instead of silica (10 −3 dB/m). We present and discuss current and possible future multi-object applications of the polymer imaging bundle in the context of astronomical instrumentation including: field acquisition, guiding, wavefront sensing, narrow-band imaging, aperture masking, and speckle imaging. The use of PMMA limits its use in low-light applications (e.g., imaging of galaxies) however, it is possible to fabricate polymer imaging bundles from a range of polymers that are better suited to the desired science.
Miniaturized Shack-Hartmann wavefront sensors for starbugs
Publisher: SPIE
Date: 18-07-2014
DOI: 10.1117/12.2055014
All-plastic fiber-based pressure sensor
Publisher: The Optical Society
Date: 29-01-2016
DOI: 10.1364/AO.55.000811
Magneto-optical effect in cobalt nanoparticle doped polymer optical material
Publisher: IEEE
Date: 07-2008
Hollow THz waveguide designs
Publisher: IEEE
Date: 12-2010
Low cost photonic comb for sub-m/s wavelength calibration
Publisher: SPIE
Date: 22-07-2016
DOI: 10.1117/12.2233678
Low Energy Laser Treatments Control Annual Ryegrass (Lolium rigidum)
Publisher: Frontiers Media SA
Date: 14-01-2021
DOI: 10.3389/FAGRO.2020.601542
Abstract: Increasing concern for the ongoing availability and efficacy of herbicides is driving interest in the development of alternative physical and thermal weed control methods. Fortunately, improvements in weed detection through advancements in computing hardware and deep learning algorithms are creating an opportunity to use novel weed control tools, such as lasers, in large-scale cropping systems. For alternative control options, there are two key weed control timing opportunities, early and late post-crop emergence. Weed density for the early timing is typically higher, with a shorter window for control. Conversely, late post-emergent treatment of surviving and late-emerging weeds would occur in lower densities of larger and more variably sized weeds, given a prior weed control effort, but with a longer available weed control period. Research in laser weeding to date has primarily focused on early growth stage weeds and the ability of this approach to control larger weeds remains unknown. This study used a 25 W, 975 nm fiber-coupled diode laser to evaluate the opportunity for control of annual ryegrass ( Lolium rigidum Gaudin) and the influence of four different growth stages (three-leaf, seven-leaf, mid-tillering, and late-tillering). Annual ryegrass plants at each growth stage were treated using a laser-focused to a 5 mm diameter with five different irradiation durations developing energy densities of 1.3, 2.5, 6.4, 19.1, and 76.4 J mm −2 . At the three-leaf stage, all plants were controlled at 76.4 J mm −2 and 93.3% controlled at 19.1 J mm −2 . Complete control of seven-leaf plants was only achieved at 76.4 J mm −2 . Although laser treatments did not control mid-tillering stage plants, 76.4 J mm −2 reduced biomass by 60.2%. No similar reductions in biomass were recorded for the largest plants. This initial research assists in the development of novel weed control options in the context of large-scale conservation cropping systems. Future research should investigate the influence of laser treatments on additional weed species and the impact of increased laser power on larger weeds.
Multimode to single-mode converters: new results on 1-to-61 photonic lanterns
Publisher: SPIE
Date: 13-09-2012
DOI: 10.1117/12.925161
Polycarbonate hollow-core microstructured optical fiber
Publisher: Optica Publishing Group
Date: 21-10-2008
DOI: 10.1364/OL.33.002446
Abstract: A hollow-core microstructured polymer optical fiber is fabricated from polycarbonate material and guidance by inhibited coupling in a two-layer structure is demonstrated in two strong transmission bands with minimum losses of 9.0 dB/m at 800 nm and 3.1 dB/m at 1550 nm. The latter corresponds to a loss well below the polycarbonate material loss at this wavelength, and to our knowledge it is the lowest loss hollow-core polymer fiber reported to date. The short-term operational temperature limit of the fiber is shown to be 135 degrees C, significantly higher than that of conventional polymer optical fibers made of other polymers.
Learning the lantern: neural network applications to broadband photonic lantern modeling
Publisher: SPIE-Intl Soc Optical Eng
Date: 29-06-2021
All-fiber LP_11 mode convertors
Publisher: Optica Publishing Group
Date: 06-02-2008
DOI: 10.1364/OL.33.000306
Abstract: We describe two all-fiber devices for converting light from the fundamental mode to the second-order set of modes in optical fibers. The first is made by controlled hole collapse in a photonic crystal fiber, and the second is a twisted fused coupler made from few-moded conventional fiber. As well as having applications within fiber optics, the devices can be used to generate azimuthally polarized free-space beams.
Evaluation of Photonic Lanterns for Lossless Mode-Multiplexing
Publisher: OSA
Date: 2012
Tapered fibers embedded in silica aerogel
Publisher: Optica Publishing Group
Date: 04-09-2009
DOI: 10.1364/OL.34.002724
The Sydney-AAO Multi-object Integral field spectrograph
Publisher: Oxford University Press (OUP)
Date: 02-2012
3D printing optical fibre preforms
Publisher: OSA
Date: 2015
1:61 photonic lanterns for astrophotometry: a performance study
Publisher: Oxford University Press (OUP)
Date: 05-11-2012
Research priorities for COVID-19 sensor technology
Publisher: Springer Science and Business Media LLC
Date: 18-01-2021
Photonic Lanterns for Mode Division Multiplexing
Publisher: OSA
Date: 2014
Photonic-Lantern-Based Mode Multiplexers for Few-Mode-Fiber Transmission
Publisher: OSA
Date: 2014
Hexabundle optical fibre imaging devices for the Hector instrument
Publisher: SPIE
Date: 03-01-2020
DOI: 10.1117/12.2539992
Silica aerogel core waveguide
Publisher: The Optical Society
Date: 08-10-2010
DOI: 10.1364/OE.18.022497
Space photonics: A new era of space instrumentation
Publisher: IEEE
Date: 08-2011
Miniaturized Shack-Hartmann wavefront-sensors for ELTs
Publisher: eScholarship
Date: 2015
Fibres Are Looking Up: Optical Fibre Transition Structures In Astrophotonics
Publisher: OSA
Date: 2010
Development of an array-waveguide grating astronomical spectrograph
Publisher: OSA
Date: 2010
Splice-free interfacing of photonic crystal fibers
Publisher: Optica Publishing Group
Date: 07-2005
DOI: 10.1364/OL.30.001629
Abstract: We report a new method for making low-loss interfaces between conventional single-mode fibers and photonic crystal fibers (PCFs). Adapted from the fabrication of PCF preforms from stacked tubes and rods, this method avoids the need for splicing and is versatile enough to interface to virtually any type of index-guiding silica PCF. We illustrate the method by forming interfaces to two problematic types of PCF, highly nonlinear and multicore. In particular, we believe this to be the first method capable of in idually coupling light into and out of all the cores of a fiber with multiple closely spaced cores, without input or output cross talk.
Temperature effects on emission of quantum dots embedded in polymethylmethacrylate
Publisher: Optica Publishing Group
Date: 11-05-2010
DOI: 10.1364/AO.49.002749
Portable frequency combs for optical frequency metrology
Publisher: The Optical Society
Date: 09-07-2012
DOI: 10.1364/OE.20.016671
Fabrication and application of fiber Bragg gratings in Astronomy
Publisher: OSA
Date: 2016
Wavelength selective switching and pulse-shaping for mode-division multiplexing using LCOS-technology
Publisher: OSA
Date: 2014
A loss-based, magnetic field sensor implemented in a ferrofluid infiltrated microstructured polymer optical fiber
Publisher: AIP Publishing
Date: 17-03-2014
DOI: 10.1063/1.4869129
Abstract: We report an in-fiber magnetic field sensor based on magneto-driven optical loss effects, while being implemented in a ferrofluid infiltrated microstructured polymer optical fiber. We demonstrate that magnetic field flux changes up to 2000 gauss can be detected when the magnetic field is applied perpendicular to the fiber axis. In addition, the sensor exhibits high polarization sensitivity for the interrogated wavelengths, providing the possibility of both field flux and direction measurements. The underlying physical and guidance mechanisms of this sensing transduction are further investigated using spectrophotometric, light scattering measurements, and numerical simulations, suggesting photonic Hall effect as the dominant physical, transducing mechanism.
Control of surface modes in low loss hollow-core photonic bandgap fibers
Publisher: IEEE
Date: 05-2008
Holistic spectroscopy: complete reconstruction of a wide-field, multiobject spectroscopic image using a photonic comb
Publisher: Oxford University Press (OUP)
Date: 13-08-2018
The GALAH survey: The data reduction pipeline
Publisher: Oxford University Press (OUP)
Date: 17-08-2017
Hector: A modular integral field spectrograph instrument for the Anglo-Australian Telescope
Publisher: SPIE
Date: 06-07-2018
DOI: 10.1117/12.2309893
Twin-hollow-core optical fibres
Publisher: No publisher found
Date: 2009
Spectroscopy of 3D-trapped particles inside a hollow-core microstructured optical fiber
Publisher: No publisher found
PRAXIS: An OH suppression optimised near infrared spectrograph
Publisher: SPIE
Date: 06-01-2020
DOI: 10.1117/12.2539883
3D-M3: high-spatial-resolution spectroscopy with extreme AO and 3D-printed micro-lenslets
Publisher: Optica Publishing Group
Date: 23-06-2021
DOI: 10.1364/AO.420855
Abstract: By combining integral field spectroscopy with extreme adaptive optics, we are now able to resolve objects close to the diffraction limit of large telescopes, exploring new science cases. We introduce an integral field unit designed to couple light with a minimal plate scale from the SCExAO facility at NIR wavelengths to a single-mode spectrograph. The integral field unit has a 3D-printed micro-lens array on top of a custom single-mode multi-core fiber, to optimize the coupling of light into the fiber cores. We demonstrate the potential of the instrument via initial results from the first on-sky runs at the 8.2 m Subaru Telescope with a spectrograph using off-the-shelf optics, allowing for rapid development with low cost.
Single-mode fiber and few-mode fiber photonic lanterns performance evaluated for use in a scalable real-time photon counting ground receiver
Publisher: SPIE
Date: 04-03-2019
DOI: 10.1117/12.2507478
A complex multi-notch astronomical filter to suppress the bright infrared sky
Publisher: Springer Science and Business Media LLC
Date: 06-12-2011
DOI: 10.1038/NCOMMS1584
Abstract: A long-standing and profound problem in astronomy is the difficulty in obtaining deep near-infrared observations due to the extreme brightness and variability of the night sky at these wavelengths. A solution to this problem is crucial if we are to obtain the deepest possible observations of the early Universe, as redshifted starlight from distant galaxies appears at these wavelengths. The atmospheric emission between 1,000 and 1,800 nm arises almost entirely from a forest of extremely bright, very narrow hydroxyl emission lines that varies on timescales of minutes. The astronomical community has long envisaged the prospect of selectively removing these lines, while retaining high throughput between them. Here we demonstrate such a filter for the first time, presenting results from the first on-sky tests. Its use on current 8 m telescopes and future 30 m telescopes will open up many new research avenues in the years to come.
Wideband, low loss Terahertz propagation through kagome air-core microstructured fibers
Publisher: IEEE
Date: 08-2011
Antiresonant reflection and inhibited coupling in hollow-core square lattice optical fibres
Publisher: Optica Publishing Group
Date: 07-04-2008
DOI: 10.1364/OE.16.005642
Abstract: We propose a guidance mechanism in hollow-core optical fibres dominated by antiresonant reflection from struts of solid material in the cladding. Resonances with these struts determine the high loss bands of the fibres, and vector effects become important in determining the width of these bands through the non-degeneracy of the TE and TM polarised strut modes near cut-off. Away from resonances the light is confined through the inhibited coupling mechanism. This is demonstrated in a square lattice hollow-core microstructured polymer optical fibre.
PRAXIS: Low thermal emission high efficiency OH suppressed fibre spectrograph
Publisher: SPIE
Date: 28-07-2014
DOI: 10.1117/12.2055597
Efficient Detection and Characterization of Exoplanets within the Diffraction Limit: Nulling with a Mode-selective Photonic Lantern
Publisher: American Astronomical Society
Date: 10-2022
Abstract: Coronagraphs allow for faint off-axis exoplanets to be observed, but are limited to angular separations greater than a few beam widths. Accessing closer-in separations would greatly increase the expected number of detectable planets, which scales inversely with the inner working angle. The vortex fiber nuller (VFN) is an instrument concept designed to characterize exoplanets within a single beam width. It requires few optical elements and is compatible with many coronagraph designs as a complementary characterization tool. However, the peak throughput for planet light is limited to about 20%, and the measurement places poor constraints on the planet location and flux ratio. We propose to augment the VFN design by replacing its single-mode fiber with a six-port mode-selective photonic lantern, retaining the original functionality while providing several additional ports that reject starlight but couple planet light. We show that the photonic lantern can also be used as a nuller without a vortex. We present monochromatic simulations characterizing the response of the photonic lantern nuller (PLN) to astrophysical signals and wavefront errors, and show that combining exoplanet flux from the nulled ports significantly increases the overall throughput of the instrument. We show using synthetically generated data that the PLN detects exoplanets more effectively than the VFN. Furthermore, with the PLN, the exoplanet can be partially localized, and its flux ratio constrained. The PLN has the potential to be a powerful characterization tool complementary to traditional coronagraphs in future high-contrast instruments.
Mode-Group-Selective Photonic Lantern Using Graded-Index Multimode Fibers
Publisher: OSA
Date: 2015
An In-Fiber Magnetometer Implemented in a Polymeric-MOF Utilizing Ferrofluid
Publisher: Springer New York
Date: 06-06-2013
Transverse mode-switchable fiber laser based on a photonic lantern
Publisher: The Optical Society
Date: 29-11-2018
DOI: 10.1364/OE.26.032777
Hector: A new massively multiplexed IFU instrument for the Anglo-Australian Telescope
Publisher: SPIE
Date: 04-08-2016
DOI: 10.1117/12.2230740
PIMMS échelle: the next generation of compact diffraction limited spectrographs for arbitrary input beams
Publisher: SPIE
Date: 08-07-2014
DOI: 10.1117/12.2055638
A ferrofluid infiltrated polymeric microstructured optical fiber sensor for magnetic field measurements
Publisher: IEEE
Date: 09-2012
Divide and conquer: an efficient solution to highly multimoded photonic lanterns from multicore fibres
Publisher: The Optical Society
Date: 13-07-2017
DOI: 10.1364/OE.25.017530
Modifying photonic crystal fibres
Publisher: IEEE
Date: 07-2009
Precision radial velocities with inexpensive compact spectrographs
Publisher: SPIE
Date: 04-08-2016
DOI: 10.1117/12.2232126
Erbium-Doped Fiber Amplifier for OAM Modes Using an Annular-Core Photonic Lantern
Publisher: OSA
Date: 2017
Multimode fiber devices with single-mode performance
Publisher: Optica Publishing Group
Date: 10-2005
DOI: 10.1364/OL.30.002545
Abstract: A taper transition can couple light between a multimode fiber and several single-mode fibers. If the number of single-mode fibers matches the number of spatial modes in the multimode fiber, the transition can have low loss in both directions. This enables the high performance of single-mode fiber devices to be attained in multimode fibers. We report an experimental proof of concept by using photonic crystal fiber techniques to make the transitions, demonstrating a multimode fiber filter with the transmission spectrum of a single-mode fiber grating.
All-fiber mode-group-selective photonic lantern using graded-index multimode fibers
Publisher: The Optical Society
Date: 06-01-2015
DOI: 10.1364/OE.23.000224
Wavelength-independent all-fiber mode converters
Publisher: Optica Publishing Group
Date: 26-01-2007
DOI: 10.1364/OL.32.000328
Abstract: We have used two different photonic crystal fiber (PCF) techniques to make all-fiber mode converters. An LP(01) to LP(11) mode converter was made by the ferrule technique on a drawing tower, and an LP(01) to LP(02) mode converter was made by controlled hole inflation of an existing PCF on a tapering rig. Both devices rely on adiabatic propagation rather than resonant coupling so high extinction was achieved across a wide wavelength range.
Broadband Mode Convertors in Photonic Crystal Fibres
Publisher: IEEE
Date: 07-2007
Seeking celestial positronium with an OH-suppressed diffraction-limited spectrograph
Publisher: Optica Publishing Group
Date: 23-06-2021
DOI: 10.1364/AO.421560
Abstract: Celestially, positronium (Ps) has been observed only through gamma-ray emission produced by its annihilation. However, in its triplet state, a Ps atom has a mean lifetime long enough for electronic transitions to occur between quantum states. This produces a recombination spectrum observable in principle at near IR wavelengths, where angular resolution greatly exceeding that of the gamma-ray observations is possible. However, the background in the near IR is dominated by extremely bright atmospheric hydroxyl (OH) emission lines. In this paper, we present the design of a diffraction-limited spectroscopic system using novel photonic components—a photonic lantern, OH fiber Bragg grating filters, and a photonic TIGER 2D pseudo-slit—to observe the Ps Balmer alpha line at 1.3122 µm for the first time, to our knowledge.
A grating-less in-fibre magnetometer realised in a polymer-MOF infiltrated using ferrofluid
Publisher: SPIE
Date: 06-2012
DOI: 10.1117/12.922700
Photonic lantern as mode multiplexer for multimode optical communications
Publisher: Elsevier BV
Date: 02-2017
A miniature curvature wavefront sensor with coherent fiber image bundle
Publisher: SPIE
Date: 04-08-2014
DOI: 10.1117/12.2055584
An all-photonic focal-plane wavefront sensor
Publisher: Springer Science and Business Media LLC
Date: 21-10-2020
DOI: 10.1038/S41467-020-19117-W
Abstract: Adaptive optics (AO) is critical in astronomy, optical communications and remote sensing to deal with the rapid blurring caused by the Earth’s turbulent atmosphere. But current AO systems are limited by their wavefront sensors, which need to be in an optical plane non-common to the science image and are insensitive to certain wavefront-error modes. Here we present a wavefront sensor based on a photonic lantern fibre-mode-converter and deep learning, which can be placed at the same focal plane as the science image, and is optimal for single-mode fibre injection. By measuring the intensities of an array of single-mode outputs, both phase and litude information on the incident wavefront can be reconstructed. We demonstrate the concept with simulations and an experimental realisation wherein Zernike wavefront errors are recovered from focal-plane measurements to a precision of 5.1 × 10 −3 π radians root-mean-squared-error.
Focal-plane wavefront sensing with photonic lanterns II: numerical characterization and optimization
Publisher: Optica Publishing Group
Date: 25-10-2023
DOI: 10.1364/JOSAB.502962
Enhanced visible continuum generation from a microchip 1064nm laser
Publisher: Optica Publishing Group
Date: 2006
DOI: 10.1364/OE.14.006188
Abstract: We demonstrate a cascaded nonlinear process using pump conversion to 742 nm by four-wave mixing in the normal dispersion regime then continuum generation by modulation instability to generate bright single-mode visible continuum with an average power up to -20 dBm/nm, from a compact 1064 nm infrared source in a monolithic single-mode photonic crystal fibre with a tapered section in one end.
Single mode propagation through a terahertz kagome microstructured fiber
Publisher: SPIE
Date: 09-06-2011
DOI: 10.1117/12.900529
Correcting vortex splitting in higher order vortex beams
Publisher: The Optical Society
Date: 17-04-2014
DOI: 10.1364/OE.22.009920
Control of surface modes in hollow-core bandgap fibers
Publisher: SPIE
Date: 25-04-2008
DOI: 10.1117/12.780822
Core-to-core uniformity improvement in multi-core fiber Bragg gratings
Publisher: SPIE
Date: 07-08-2014
DOI: 10.1117/12.2055623
First science with SAMI: A serendipitously discovered galactic wind in ESO 185-G031
Publisher: American Astronomical Society
Date: 05-12-2012
Astrophotonics: A promising arena for silicon photonics
Publisher: SPIE
Date: 14-03-2019
DOI: 10.1117/12.2511917
Photonic lantern broadband orbital angular momentum mode multiplexer
Publisher: The Optical Society
Date: 31-10-2018
DOI: 10.1364/OE.26.030042
Control over the transverse structure and long-distance fiber propagation of light at the single-photon level
Publisher: Springer Science and Business Media LLC
Date: 21-06-2019
DOI: 10.1038/S41598-019-45082-6
Abstract: Quantum entanglement is arguably the cornerstone which differentiates the quantum realm from its classical counterpart. While entanglement can reside in any photonic degree of freedom, polarization permits perhaps the most straightforward manipulation due to the widespread availability of standard optical elements such as waveplates and polarizers. As a step towards a fuller exploitation of entanglement in other degrees of freedom, in this work we demonstrate control over the transverse spatial structure of light at the single-photon level. In particular we integrate in our setup all the technologies required for: (i) fibre-based photon pair generation, (ii) deterministic and broadband single-photon spatial conversion relying on a passive optical device, and (iii) single-photon transmission, while retaining transverse structure, over 400 m of few-mode fibre. In our experiment, we employ a mode selective photonic lantern multiplexer with the help of which we can convert the transverse profile of a single photon from the fundamental mode into any of the supported higher-order modes. We also achieve conversion to an incoherent or coherent addition of two user-selected higher order modes by addressing different combinations of inputs in the photonic lantern multiplexer. The coherent nature of the addition, and extraction of usable orbital angular momentum at the single-photon level, is further demonstrated by far-field diffraction through a triangular aperture. Our work could enable studies of photonic entanglement in the transverse modes of a fibre and could constitute a key resource quantum for key distribution with an alphabet of scalable dimension.
Reducing the Size of Hollow Terahertz Waveguides
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2011
Measurement and limitations of optical orbital angular momentum through corrected atmospheric turbulence
Publisher: The Optical Society
Date: 04-02-2016
DOI: 10.1364/OE.24.002919
Efficient injection from large telescopes into single-mode fibres: Enabling the era of ultra-precision astronomy
Publisher: EDP Sciences
Date: 08-2017
All-fiber anamorphic core-shape transitions
Publisher: Optica Publishing Group
Date: 25-08-2006
DOI: 10.1364/OL.31.002672
Abstract: We demonstrate low-loss anamorphic transitions between circular and rectangular fiber cores with aspect ratios up to 5:1, and hence improved coupling from a diode laser by using only a spherical lens. Differential hole pressurization and localized heating of a stock photonic crystal fiber inflates the holes at different rates. Some holes are plugged in the fiber end face where pressure is applied, so they remain at ambient pressure. Alternatively, holes of different sizes expand at different rates because the effective pressure due to surface tension differs.
Composite fiber refractive index sensor based on directional couplers near cutoff
Publisher: IEEE
Date: 08-2011
The Hector Instrument: performance of the Hector fibre integral field units
Publisher: SPIE
Date: 13-12-2020
DOI: 10.1117/12.2561514
Enhanced magneto-optical effect in cobalt nanoparticle-doped optical fiber
Publisher: Optica Publishing Group
Date: 03-12-2008
DOI: 10.1364/AO.47.006497
Abstract: An enhanced magnetic Faraday effect is demonstrated in cobalt nanoparticle-doped polymer optical fiber. Magneto-optically induced rotation of the plane of polarization proportional to both the dopant particle concentration and the magnetic field strength is demonstrated. Potential applications include magnetic field sensors, current sensors, and in-fiber optical isolators.
Air-structured optical fiber drawn from a 3D-printed preform
Publisher: The Optical Society
Date: 19-08-2015
DOI: 10.1364/OL.40.003966
Mode Selective Photonic Lantern with Graded Index Core
Publisher: OSA
Date: 2018
Supercontinuum generation in submicron fibre waveguides
Publisher: Optica Publishing Group
Date: 26-06-2004
Abstract: Submicron-diameter tapered fibres and photonic crystal fibre cores, both of which are silica-air waveguides with low dispersion at 532 nm, were made using a conventional tapering process. In just cm of either waveguide, ns pulses from a low-power 532-nm microchip laser generated a single-mode supercontinuum broad enough to fill the visible spectrum without spreading far beyond it.
Multigigabit short-reach communication over microstructured polymer optical fiber
Publisher: Elsevier BV
Date: 03-2017
The SAMI Galaxy Survey: Early Data Release
Publisher: Oxford University Press (OUP)
Date: 20-11-2015
1x11 few-mode fiber wavelength selective switch using photonic lanterns
Publisher: The Optical Society
Date: 27-01-2014
DOI: 10.1364/OE.22.002216
Mapping the aberrations of a wide-field spectrograph using a photonic comb
Publisher: The Optical Society
Date: 26-06-2017
DOI: 10.1364/OE.25.015614
On the origin of core-to-core variations in multi-core fibre Bragg gratings
Publisher: SPIE
Date: 10-07-2018
DOI: 10.1117/12.2312895
RedEye-1: a compact SWIR hyperspectral imager for observation of atmospheric methane and carbon dioxide
Publisher: Optica Publishing Group
Date: 23-10-2023
Single mode, extreme precision doppler spectrographs
Publisher: Cambridge University Press (CUP)
Date: 08-2012
DOI: 10.1017/S1743921313013264
Abstract: The ‘holy grail’ of exoplanet research today is the detection of an earth-like planet: a rocky planet in the habitable zone around a main-sequence star. Extremely precise Doppler spectroscopy is an indispensable tool to find and characterize earth-like planets however, to find these planets around solar-type stars, we need nearly one order of magnitude better radial velocity (RV) precision than the best current spectrographs provide. Recent developments in astrophotonics (Bland-Hawthorn & Horton 2006, Bland-Hawthorn et al . 2010) and adaptive optics (AO) enable single mode fiber (SMF) fed, high resolution spectrographs, which can realize the next step in precision. SMF feeds have intrinsic advantages over multimode fiber or slit coupled spectrographs: The intensity distribution at the fiber exit is extremely stable, and as a result the line spread function of a well-designed spectrograph is fully decoupled from input coupling conditions, like guiding or seeing variations (Ihle et al . 2010). Modal noise, a limiting factor in current multimode fiber fed instruments (Baudrand & Walker 2001), can be eliminated by proper design, and the diffraction limited input to the spectrograph allows for very compact instrument designs, which provide excellent optomechanical stability. A SMF is the ideal interface for new, very precise wavelength calibrators, like laser frequency combs (Steinmetz et al . 2008, Osterman et al . 2012), or SMF based Fabry-Perot Etalons (Halverson et al . 2013). At near infrared wavelengths, these technologies are ready to be implemented in on-sky instruments, or already in use. We discuss a novel concept for such a spectrograph.
Beating the classical limit: A diffraction-limited spectrograph for an arbitrary input beam
Publisher: The Optical Society
Date: 24-10-2013
DOI: 10.1364/OE.21.026103
Photonic lanterns for mode division multiplexing
Publisher: IEEE
Date: 10-2016
Few-Mode Fiber Wavelength Selective Switch with Spatial-Diversity and Reduced-Steering Angle
Publisher: OSA
Date: 2014
Spectroscopy of 3D-trapped particles inside a hollow-core microstructured optical fiber
Publisher: The Optical Society
Date: 05-2012
DOI: 10.1364/OE.20.011232
Control of surface modes in low loss hollow-core photonic bandgap fibers
Publisher: Optica Publishing Group
Date: 2008
DOI: 10.1364/OE.16.001142
Abstract: We report on the fabrication and characterization of hollow-core photonic bandgap fibers that do not suffer from surface mode coupling within the photonic bandgap of the cladding. This enables low attenuation over the full spectral width of the bandgap--we measured a minimum loss of 15 dB/km and less than 50 dB/km over 300 nm for a fiber operating at 1550 nm. As a result of the increased bandwidth, the fiber has reduced dispersion and dispersion slope--by a factor of almost 2 compared to previous fibers. These features are important for several applications in high-power ultrashort pulse compression and delivery. Realizing these advances has been possible due to development of a modified fabrication process which makes the production of low-loss hollow-core fibers both simpler and quicker than previously.
First demonstration of OH suppression in a high-efficiency near-infrared spectrograph
Publisher: Oxford University Press (OUP)
Date: 08-01-2020
Abstract: Ground-based near-infrared (NIR) astronomy is severely h ered by the forest of atmospheric emission lines resulting from the rovibrational decay of OH molecules in the upper atmosphere. The extreme brightness of these lines, as well as their spatial and temporal variability, makes accurate sky subtraction difficult. Selectively filtering these lines with OH suppression instruments has been a long standing goal for NIR spectroscopy. We have shown previously the efficacy of fibre Bragg gratings (FBGs) combined with photonic lanterns for achieving OH suppression. Here we report on PRAXIS, a unique NIR spectrograph that is optimized for OH suppression with FBGs. We show for the first time that OH suppression (of any kind) is possible with high overall throughput (18 per cent end-to-end), and provide ex les of the relative benefits of OH suppression.
Post-processing and tapering of PCFs
Publisher: IEEE
Date: 2008
7.3-Gb/s Transmission Over Microstructured Polymer Optical Fiber for In-Home Networks
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2012
Holey fiber mode-selective couplers
Publisher: The Optical Society
Date: 14-07-2015
DOI: 10.1364/OE.23.018888
Foundations of Photonic Crystal Fibres
Publisher: IMPERIAL COLLEGE PRESS
Date: 08-2012
DOI: 10.1142/P782
Multicore optical fibres for astrophotonics
Publisher: IEEE
Date: 05-2011
All-fibre focal-plane wavefront sensor
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEOPR.2020.PDP_1
Abstract: We present a new type of wavefront sensor based on a fibre-mode-converter and deep learning. By only measuring intensities of the single-mode outputs array, both phase and litude on the incident wavefront can be reconstructed.
The nature of the near-infrared interline sky background using fibre Bragg grating OH suppression
Publisher: Oxford University Press (OUP)
Date: 16-05-2013
DOI: 10.1093/MNRAS/STT677
2023 Astrophotonics Roadmap: pathways to realizing multi-functional integrated astrophotonic instruments
Publisher: IOP Publishing
Date: 10-2023
Abstract: Photonic technologies offer numerous functionalities that can be used to realize astrophotonic instruments. The most spectacular ex le to date is the ESO Gravity instrument at the Very Large Telescope in Chile that combines the light-gathering power of four 8-m telescopes through a complex photonic interferometer. Fully integrated astrophotonic devices offer critical advantages for instrument development, including extreme miniaturization when operating at the diffraction-limit, plus integration, superior thermal and mechanical stabilization owing to the small footprint, and high replicability offering significant cost savings. Numerous astrophotonic technologies have been developed to address shortcomings of conventional instruments to date, including the development of photonic lanterns to convert from multimode inputs to single mode outputs, complex aperiodic fiber Bragg gratings to filter OH emission from the atmosphere, beam combiners enabling long baseline interferometry with for ex le, ESO Gravity, and laser frequency combs for high precision spectral calibration of spectrometers. Despite these successes, the facility implementation of photonic solutions in astronomical instrumentation is currently limited because of 1) low throughputs from coupling to fibers, coupling fibers to chips, propagation and bend losses, device losses, etc., 2) difficulties with scaling to large channel count devices needed for large bandwidths and high resolutions, and 3) efficient integration of photonics with detectors. In this roadmap, we identify 23 key areas that need further development. We outline the challenges and advances needed across those areas covering design tools, simulation capabilities, fabrication processes, the need for entirely new components, integration and hybridization and the characterization of devices. To realize these advances the astrophotonics community will have to work cooperatively with industrial partners who have more advanced manufacturing capabilities. With the advances described herein, multi-functional integrated instruments will be realized leading to novel observing capabilities for both ground and space based platforms, enabling new scientific studies and discoveries.
Refractive index sensor based on a polymer fiber directional coupler for low index sensing
Publisher: The Optical Society
Date: 11-07-2014
DOI: 10.1364/OE.22.017497
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University Of Strathclyde
Location: United Kingdom of Great Britain and Northern Ireland
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View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE130100198
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View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE150100144
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View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE120100199
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