A5030021406- Photonic Crystal and Fiber Optics
- Optical Network Technologies
- Advanced Fiber Optic Sensors
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Optical Coherence Tomography Applications
- Adaptive optics and wavefront sensing
- Spectroscopy Techniques in Biomedical and Chemical Research
- Semiconductor Lasers and Optical Devices
- Spectroscopy and Laser Applications
- Solid State Laser Technologies
- Stellar, planetary, and galactic studies
- Laser-Matter Interactions and Applications
- Advanced Optical Sensing Technologies
- Astronomy and Astrophysical Research
- Photoacoustic and Ultrasonic Imaging
- Optical Wireless Communication Technologies
- Advanced Photonic Communication Systems
- Photonic Crystals and Applications
- Spectroscopy and Chemometric Analyses
- Advanced Fluorescence Microscopy Techniques
- Non-Invasive Vital Sign Monitoring
- Advanced optical system design
- Advanced Optical Network Technologies
- Orbital Angular Momentum in Optics
Cyprus University of Technology
2024
University of Bath
2015-2024
University of Central Florida
2022-2024
Centre for Inflammation Research
2022-2023
Queen's Medical Centre
2022-2023
University of Edinburgh
2022-2023
Scottish Universities Physics Alliance
2023
Heriot-Watt University
2023
University of Florida
2023
Photonic lanterns are made by adiabatically merging several single-mode cores into one multimode core. They provide low-loss interfaces between and systems where the precise optical mapping individual modes is unimportant.
Antiresonant hollow-core fibers (AR-HCFs) have opened up exciting possibilities for high-energy and high-power laser delivery because of their exceptionally low nonlinearities high damage thresholds. While these fiber designs offer great potential handling kilowatt-class powers, it is crucial to investigate performance at multi-kW power levels. Until now, transmission narrow-linewidth single-mode lasers levels through a HCF has not been demonstrated, our knowledge. Here, we present the...
Simple all-fiber three-mode multiplexers were made by adiabatically merging three dissimilar single-mode cores into one multimode core. This was achieved collapsing air holes in a photonic crystal fiber and (in separate device) fusing tapering telecom fibers fluorine-doped silica capillary. In each case the LP01 mode both LP11 modes individually excited from input cores, with losses below 0.3 0.7 dB respectively purities exceeding 10 dB. Scaling to more is challenging, but would be assisted...
Photonics offer numerous functionalities that can be used to realize astrophotonic instruments. The most spectacular example date is the ESO Gravity instrument at Very Large Telescope in Chile. Integrated devices stand critical advantages for development, including extreme miniaturization, as well integration, superior thermal and mechanical stabilization owing small footprint, high replicability offering cost savings. Numerous technologies have been developed address shortcomings of...
Hollow-core fibers have demonstrated record performance in applications such as high-power pulse delivery, quantum computing, and sensing. However, their routine use is yet to become reality. A major obstacle the ability maintain polarization state of light over a broad range wavelengths, while also ensuring low attenuation single-mode guidance. Here we simulated, fabricated characterized polarization-maintaining anti-resonant hollow-core fiber. The birefringence was achieved by introducing...
The two-stage stack and draw technique is an established method for fabricating microstructured fibers, including hollow-core fibers. A of glass elements around a meter in length centimeters outer diameter forms the first stage preform, which drawn into millimeter scale canes. second preform one canes, drawn, under active pressure, microscopic fiber. Separately controlled pressure lines are connected to different holes or sets cane control microstructure fiber being often relying on glues...
Fiber-based Raman spectroscopy in the context of vivo biomedical application suffers from presence background fluorescence surrounding tissue that might mask crucial but inherently weak signatures. One method has shown potential for suppressing to reveal spectra is shifted excitation (SER). SER collects multiple emission by shifting small amounts and uses these computationally suppress based on principle spectrum shifts with while does not. We introduce a utilizes spectral characteristics...
Measuring Raman spectra through an optical fibre is usually complicated by the high intrinsic scatter of material. Common solutions such as use multiple fibres and distal optics are complex bulky. We demonstrate single novel hollow‐core negative‐curvature (NCFs) for surface‐enhanced spectroscopy (SERS) sensing using no optics. The background emission from silica in NCF was at least 1000× smaller than a conventional solid fibre, while maintaining same collection efficiency. transmitted pump...
In astronomy and related fields there is a pressing need to efficiently inject light, transmitted through the atmosphere, into single-mode fibre. However this extremely difficult due large, rapidly changing aberrations imprinted on light by turbulent atmosphere. An adaptive optics system must be used, but its effectiveness limited non-common-path insensitivity certain crucial modes. Here we introduce new concept device - hybrid mode-selective photonic lantern which incorporates both focal...
It is well known that a fiber taper—an optical whose size varies along its length—must exceed certain minimum length to be adiabatic and low-loss. In contrast, we show an with logarithmic refractive index profile can adiabatically tapered over any length, however short. Its mode field distribution independent of the fiber’s so remains same taper. We report experimental in which tapers shorter than 2 mm have losses as low 0.03 dB. The compatible standard telecoms but bend loss should...
We measured the transmission of tapered and untapered optical fibres as a function input beam numerical aperture at 635 nm. The were fabricated with an adiabatic tapering process from graded step-index 50 μm core diameters to form 100 mm long taper 5:1 ratio. tested graded-index commercial Thorlabs products custom taper. fibre can give greater than 0.4 for 0.6 simulated found reasonable agreement results across range interest. Experimentally, performed relative poorly considerably below...
Simple all-fibre mode multiplexers were made by controllably collapsing air holes along a short length of photonic crystal fibre. The LP01 and both LP11 modes excited from three separate input cores, with less than 0.1 dB loss at the wavelength 1550 nm.
Photonic lantern nulling (PLN) is a method for enabling the detection and characterization of close-in exoplanets by exploiting symmetries ports mode-selective photonic (MSPL) to cancel out starlight. A six-port MSPL provides four where on-axis starlight suppressed, while off-axis planet light coupled with efficiencies that vary as function planet's spatial position. We characterize properties in laboratory perform first testbed demonstration PLN monochromatic (1569 nm) broadband (1450 1625...
Tunable ultrashort pulses in the ultraviolet spectral region are great demand for a wide range of applications, including spectroscopy and pump–probe experiments. While laser sources capable producing such exist, they typically very complex. Notably, resonant dispersive-wave (RDW) emission has emerged as simple technique generating pulses. However, required pulse energy used to drive RDW emission, so far, is mostly at microjoule level, requiring complicated expensive pump sources. Here, we...
Recent advancements in anti-resonant hollow-core fiber design have yielded fibers with ultra-low loss. However, preserving polarization alongside low-loss performance remains a challenge. Our study explores different geometries, revealing an achievable birefringence of 2x10^-5 and minimal confinement loss (< 10 dB/km). These enhanced types designs hold promise for transformative applications optical quantum communication networks sensing.
Photonic lanterns (PLs) are waveguide devices enabling high-throughput single-mode spectroscopy and high angular resolution. We aim to present the first on-sky demonstration of a PL operating in visible light, measure its throughput assess potential for high-resolution compact objects. used SCExAO instrument (a double-stage extreme adaptive optics system installed at Subaru Telescope) FIRST mid-resolution spectrograph (R 3000) test capabilities on internal source observations. The best...
We report mode multiplexers with single-mode inputs directly compatible standard telecoms fibres. They are made by fusing and tapering three such fibres in a fluorine-doped silica capillary. The fused act as the core of multimode fibre, which individual modes could be separately excited. loss is 0.6-0.7 dB.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text B. Winter, D. Vorobiev, Fleming, E. Witt, W. Gilliam, K. R. Rusimova, S. Yerolatsitis, T. A. Birks, and J. Wadsworth, "185nm Guidance in a Hollow Core Optical Fibre," Frontiers Optics + Laser Science APS/DLS, OSA Technical Digest (Optica Publishing Group, 2019), paper JTu3A.19. Export BibTex Endnote (RIS) HTML Plain alert Save article
We describe a multicore fiber for nonlinear endoscopy where an ultrashort pulse is divided up and delivered through multiple cores to reduce the peak power. The variation in group index between of minimized allow simultaneously launched sub-pulses arrive at distal end synchronously. Minimization achieved V parameter 3 owing turning point relationship parameter. For synchronized arrival times, single-mode propagation important. By tapering short length launch end, value locally brought below...
Optical fibers with a logarithmic index profile can provide invariant mode field diameters along tapered fiber, which enables adiabatic transitions for higher-order (HOM) microfibers. A microfiber waist diameter of ∼2 µm is fabricated an insertion loss lower than 0.03 dB the LP01 and 0.11 LP11 mode. The concept low HOM microfibers be further extended to include more one fiber 2×2 few coupler fabricated/characterized in our experiments. These single or multiple spatial channel are beneficial...
We report on a tapered three-core optical fibre that can be used as tip-tilt wavefront sensor. In this device, coupled region of few millimetres at the sensing tip converts fragile phase information from an incoming into robust intensity within each cores. The easily converted to linear error over small ranges, making it ideal for closed loop systems. sensor uses minimal infer and is compatible with remote detector arrays. explore its application adaptive optics present validation case show...
We present an endoscopic probe that combines three distinct optical fibre technologies including: A high-resolution imaging for endomicroscopy, a multimode time-resolved fluorescence spectroscopy, and hollow-core with signal collection cores Raman spectroscopy. The fibers are all enclosed within 1.2 mm diameter clinical grade catheter 1.4 end cap. To demonstrate the probe's flexibility we provide data acquired it in loops of radii down to 2 cm. then use anatomically accurate model adult...
We report two different types of all-fibre pseudo-slit reformatters made either by tapering bundles single-mode fibres or postprocessing a photonic crystal fibre. These devices convert the modes multimode core to linear output structure, achieving diffraction limited pattern in one direction.
We report mode-selective photonic lanterns made from multicore fibres with several dissimilar cores. Six-mode and ten-mode multiplexers are demonstrated. Such designs potentially offer the maximum possible number of multiplexed modes in lanterns.