Conveners
7th International Workshop on Speciality Optical Fibres: WSOF 1 - Advanced Fabrication 1
- Heike Ebendorff-Heidepriem
7th International Workshop on Speciality Optical Fibres: WSOF 2 - Fibre Sensing 1
- Michel Digonnet (Stanford University)
7th International Workshop on Speciality Optical Fibres: WSOF 3 - Fibre Lasers 1
- Clemence Jollivet (Coherent-nufern)
7th International Workshop on Speciality Optical Fibres: WSOF 4 - Advanced Fabrication 2
- John Ballato
7th International Workshop on Speciality Optical Fibres: WSOF 5 - Online/Hybrid Session
- Clarissa Harvey (Royal Institute of Technology, Stockholm, Sweden)
7th International Workshop on Speciality Optical Fibres: WSOF 6 - Fibre Sensing 2
- Heike Ebendorff-Heidepriem
7th International Workshop on Speciality Optical Fibres: WSOF 7 - Nonlinear Effects
- Stuart Jackson (Macquarie University)
7th International Workshop on Speciality Optical Fibres: WSOF 8 - Fibre Lasers 2
- FRANCOIS CHENARD
7th International Workshop on Speciality Optical Fibres: WSOF 9 - Advanced Techniques
- Ryszard Buczynski
7th International Workshop on Speciality Optical Fibres: WSOF 10 - Fibre Sensing 3
- Gang-Ding Peng
This invited talk will discuss the molten core method for fabricating a wide variety of novel glassy and crystalline core optical fibers, exhibiting an equally wide variety of fascinating properties not previously known
This work explores using CO-laser heating to fabricate speciality optical fibre from unconventional materials. The unique temperature dynamics of this furnace demonstrated fine control of crystallisation in crystal-core glass-clad fibres.
We report recent progresses and discuss key technical challenges in research and development of specialty silica optical fibres via 3D printing technologies.
We discuss Figures of Merit for quantifying the sensing performance of hollow-core terahertz light cages with respect to free space propagation. Our results point to light cages as a way of improving terahertz phase sensing capabilities.
A tactile sensitive silicone-based artificial skin is fabricated on a fingertip model with embedded ZEONEX-based polymer Bragg gratings. Through tactile force feedback and the aid of machine learning, contact localization throughout the fingertip is achieved.
I will outline recent work towards developing a nanometer sized acoustic sensor based on 1D photonic crystals, which can be used for fibre-based optomechanical acoustic sensing.
We exploit the complex nature of light transmission through multimode fibre for distributed fibre temperature sensing. This is achieved by training a regression deep neural network for extracting distributed temperature information from fibre wavelength spectra.
There is growing interest in developing visible light-emitting fibre lasers. Currently, they rely on fluoride-fibre but for some transitions silicate fibre may be suitable. Here I review silicate-based fibre lasers and offer ideas for allowing them to generate visible light.
Energising and interrogating distributed feedback fibre laser hydrophones in remote deployment scenarios requires management of the propagation loss, optical nonlinearity and judicious selection of the pump wavelength. We characterise the system for a range of pump wavelengths spanning from 1480-1540nm.
We describe the development of ultra-stable single-frequency 10W thulium fibre master oscillator power amplifiers at wavelengths between 1900nm and 2050nm, for gravitational wave detection. Environmental isolation and minimal wavelength drift is achieved using a two-stage temperature-controlled mount.
We present the experimental study of active nanostructured fiber devoted to simultaneous laser emission at two wavelengths, 1040 nm and 1534 nm. The fiber core is formed with two types of nanorods doped with ytterbium and erbium ions.
Silica hollow-core fibers (HCFs) are leading the way in advanced telecommunications and ultra- short pulse laser transmission. Chalcogenide HCFs will become the holy grail of CO2 laser transmission at 10.6 microns.
Abstract:
This talk explores the fabrications processes and “many knobs” that must be turned to achieve low nonlinearity performance in modern optical fibers.
Active optical fibers that exhibit intrinsically low nonlinearities such SBS supression or increased TMI thresholds is the end research goal for many groups. Materially, these phenomena are well understood, as is the method to achieve...
A solid-core endlessly single mode mid-infrared polarization-maintaining photonic crystal fiber (PM-PCF) made of chalcogenide glass with an asymmetric pattern of longitudinal holes having different periods and diameters is presented. Simulation and experimental results are given.
Additive manufacturing makes it possible to produce complex structures and individual pieces directly from the CAD file within short production times. This research focuses on a filament extrusion method, where the objects are directly printed from a soda-lime glass filament.
The report discusses novel all-glass optical fibers designs for dispersion management and its applications.
We summarize our recent results on design, fabrication and characterization of polarization maintaining anti-resonant hollow core fiber. Loss of 5.6 dB/km and phase birefringence of $1.8\times 10^{-5}$ is achieved.
An efficient mid-infrared Er3+-doped fluoride fiber laser operating at 2.8 μm pumped by a single-mode laser at 1.7 μm has been proposed and experimentally demonstrated for the first time.
Record-long (200 km) single-ended random fiber laser and sensor, which can be used for safety monitoring of long-haul powerlines, are proposed and demonstrated based on combination of high-order random lasing pump and ultra-low-loss fiber, for the first time.
Optical fibers with NV(-) nanodiamonds embedded along the core are reported. Magnetic field sensing is validated along with nanodiamond concentration scaling and NV(-) fluorescence coupling to the guided modes.
A fiber based polarization insensitive OCT has been developed to remove polarization artefacts from conventional OCT images. The computational processing and hardware system calibrations will be discussed. A comparison of different polarization independent schemes and results will also be presented.
We developed an optical fibre containing fluorescent micron-sized diamonds. The nitrogen-vacancy defects inside diamonds make the fibre sensitive to external magnetic fields. I will discuss the fabrication process and the sensitivity we achieved.
We present simple and robust designs for optical fiber radiation sensors for dosimetry applications, by utilizing femtosecond laser micromachining.Furthermore, we examine the implementation of our technique with plastic scintillator (BCF-10) for medical radiotherapy dosimetry.
We propose a novel approach for remote sensing and mapping of magnetic fields with high spatial resolution using NV nanodiamond layer deposited on an end-surface of an optical fiber or an imaging fiber bundle.
The transverse mode instability is a nonlinear effect that limits the power in high-energy lasers. We describe the phase-matched model for TMI which yields a drastic speedup in computation time with no loss of accuracy.
We show theoretically(and numerically) that TMI threshold increases linearly with number of equally excited modes in a multimode fiber amplifier. The multimode excitation is numerically focussed to a diffraction-limited spot, providing a stable high quality beam, with increased TMI threshold.
Herein we present a scheme for highly efficient third harmonic generation (THG) via a phase compensation between two segments of fibre; we simulate the gap between these segments to characterise the coupling, gap length, and effects of misalignment.
We experimentally obtain a diffraction-limited focused spot at the output of a multimode fiber, resulting in increased SBS threshold(1.5x). We show theoretically and experimentally an even higher(2.3x) SBS threshold is obtained by axially offsetting the focused spot.
We experimentally demonstrate that adjusting the input wavefront of a multimode fiber can be used to simultaneously shape beam and suppress simulated Brillouin scattering (SBS) for a high-power narrow linewidth system.
Fibre sources and metal-coated fibres are relevant to a range of dual-use applications. We will review DST work and highlight opportunities for collaborative programs based on these enabling technologies.
Fibre based sources present a compelling platform for the development of laser and amplifier devices to address a range of applications. The monolithic nature of fibre sources combined...
Advances in Yb-doped and Tm-doped Double-clad LMA fibers to power-scale fiber lasers beyond multi-kW are presented, demonstrating > 3 kW at 1μm and > 65% slope efficiency at 2 μm.
We have demonstrated a 6+1→1 optical fibre combiner for diode-pumped 1 µm operation, using metal coated fibre for the output fibre port with pump power levels up to 700 W
Demonstration of a polarisation maintaining all-fibre coherent beam combining system, digitally implemented using a FPGA and electro-optic modulators. The experimental implementation combines three 7 W Erbium-doped polarisation maintaining fibre amplifiers with greater than 95% efficiency and $\lambda/493$ RMS phase stability.
This presentation will discuss recent breakthroughs in optical (laser) cooling of Yb-doped silica fibers using anti-Stokes pumping, and the exciting upcoming generation of silica fiber amplifiers and lasers that run cold.
We describe a repeatable method for building and characterising a multi-plane light convertor that operates as a 55 spatial mode sorter.
We demonstrate the application of machine learning to improve the performance of specklegram pressure sensor using pure silica six-hole microstructured optical fiber. The sensor will be useful for pressure sensing in harsh industrial applications.
We fabricate a 3D achromatic diffractive metalens on the end face of a single-mode fiber, useful for endoscopic applications. We demonstrate achromatic and polarization-insensitive focusing across the entire near-infrared telecommunication wavelength band ranging from 1.25 to 1.65 µm.
We propose a torsion sensor using an FBG-based twin-core ZEONEX polymeric fiber, with a measurement range up to ±360°. Due to the central/side core arrangement, torsion can be retrieved independently from axial strain and temperature.
We report on the use of multipoint Bragg gratings fabricated in suspended core optical fibres in industrial temperature sensing applications.
The possibility of tuning the temperature and humidity sensitivities of POFBG sensors to the desired level by applying a specific amount of fibre pre-strain is demonstrated.
Metal–coated optical fibers are known for its resistance to extreme temperatures and superior mechanical properties. This research is focused on evaluating use of such technology within smart materials (3D metal printing) for temperature measurements.
This work explores embedded fibre optic sensors in lightweight PLA during 3D printing for applications in aircraft structures. The sensors are used for strain and shape sensing of a wind tunnel model of a box-wing.
Using interferometric interrogation techniques, we demonstrate measurement of the frequency noise of 4 multiplexed distributed feedback fiber lasers over a 100 km single mode fibre link.
