Alex Fuerbach
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View article: Photorefractive reservoir computing
Photorefractive reservoir computing Open
Reservoir computing (RC) is a machine learning (ML) framework that has gained attention in recent years as the interest in alternative computing paradigms has grown. RC allows the utilization of physical systems to solve ML tasks. We demon…
View article: Physical mechanisms of femtosecond laser induced refractive index change in direct-written mid-infrared fiber Bragg gratings
Physical mechanisms of femtosecond laser induced refractive index change in direct-written mid-infrared fiber Bragg gratings Open
Femtosecond laser inscription of fluoride Fiber Bragg Gratings (FBGs) has enabled the realization of all-fiber laser sources at mid-infrared wavelengths. However, many fundamental aspects of the fabrication process remain unknown, which hi…
View article: Fluoride and chalcogenide glass fiber components for mid-infrared lasers and amplifiers: Breakthroughs, challenges, and future perspective
Fluoride and chalcogenide glass fiber components for mid-infrared lasers and amplifiers: Breakthroughs, challenges, and future perspective Open
Since the early 1990s, when researchers began to explore rare-earth-doped mid-infrared glass fibers, fiber laser systems have emerged as promising high-brightness light sources with wavelengths beyond 2.5 μm for applications in spectroscop…
View article: Ultrafast laser-fabricated fluoride glass waveguides with exceptionally high positive refractive index change for mid-infrared integrated optics
Ultrafast laser-fabricated fluoride glass waveguides with exceptionally high positive refractive index change for mid-infrared integrated optics Open
This study presents the successful fabrication of waveguides with a high positive refractive index change exceeding 0.02 in rare earth-doped fluoride glass, marking a major advancement in integrated optical components for visible to mid-in…
View article: Linear and nonlinear optical properties of femtosecond laser inscribed waveguides into GLS glass
Linear and nonlinear optical properties of femtosecond laser inscribed waveguides into GLS glass Open
Gallium lanthanum sulfide (GLS) glass is a promising material for mid-infrared photonics due to its wide transmission window and its high nonlinear refractive index that is almost three orders of magnitude higher than that of fused silica.…
View article: Mid-infrared optical waveguides: missing link of integrated photonics
Mid-infrared optical waveguides: missing link of integrated photonics Open
Lack of low phonon energy glass waveguides delays the progress of integrated photonics in the mid-infrared wavelength. This perspective provides insights on the history of waveguide production in the past and what to expect in the near fut…
View article: 1.3 W, super-octave-spanning Pulses at 2.3 μm from a Cr:ZnS Amplifier
1.3 W, super-octave-spanning Pulses at 2.3 μm from a Cr:ZnS Amplifier Open
We investigate spectral broadening in TiO2 seeded by > 2 W, τ0.5 = 26 fs, 23 MHz pulses from a Cr:ZnS amplifier. We generate pulses covering spectrum from 1.1 to 3.2 µm at the -20-dB level at 1.3 W. © 2024 The Author(s)
View article: Thermally stable high numerical aperture integrated waveguides and couplers for the 3 <i>μ</i>m wavelength range
Thermally stable high numerical aperture integrated waveguides and couplers for the 3 <i>μ</i>m wavelength range Open
The femtosecond laser direct write technique was used to fabricate mid-infrared compatible waveguide couplers into Suprasil 3001, a fused silica glass with an OH content of as low as ≤1 ppm. Smooth positive step-index change multi-scan wav…
View article: Green energy generation via optical laser pressure initiated nonthermal nuclear fusion
Green energy generation via optical laser pressure initiated nonthermal nuclear fusion Open
In a recent report, the National Academies of Science, Engineering, and Medicine (NASEM) recommends that "the United States should start a national program of accompanying research and technology leading to the construction of a compact pi…
View article: MXene and PtSe<sub>2</sub> saturable absorbers for all-fibre ultrafast mid-infrared lasers
MXene and PtSe<sub>2</sub> saturable absorbers for all-fibre ultrafast mid-infrared lasers Open
We report on the feasibility of MXene and platinum diselenide (PtSe 2 ) as novel saturable absorbers for the development of wavelength stabilized passively mode-locked mid-infrared fibre laser systems. After evaluating the performance of i…
View article: Mid-IR laser for wavefront correction in gravitational wave detectors
Mid-IR laser for wavefront correction in gravitational wave detectors Open
The next-generation gravitational wave detectors aim to enhance our understanding of extreme phenomena in the Universe. The high-frequency sensitivity of these detectors will be maximized by injecting squeezed vacuum states into the detect…
View article: Towards the next generation of brain/machine interface
Towards the next generation of brain/machine interface Open
We report on the latest development of our photonics-based brain-machine interface. This work done in collaboration between UNSW and Macquarie University-and supported by the US Office of Naval Research-directly addresses the long-Term DAR…
View article: Grating Inscription Into Fluoride Fibers: A Review
Grating Inscription Into Fluoride Fibers: A Review Open
First demonstrated over four decades ago, fiber gratings, and in particular fiber Bragg gratings (FBGs), have become indispensable and ubiquitous components within fiber laser cavities as well as optical communication networks and sensor s…
View article: Numerical modelling and optimization of actively Q-switched waveguide lasers based on liquid crystal transducers
Numerical modelling and optimization of actively Q-switched waveguide lasers based on liquid crystal transducers Open
We have recently experimentally demonstrated that a novel liquid crystal-based photonic transducer for sensing systems could be utilized as an active Q-switch in a miniaturised and integrated waveguide laser system. In this paper, we now p…
View article: In-fiber polarizer based on a 45-degree tilted fluoride fiber Bragg grating for mid-infrared fiber laser technology
In-fiber polarizer based on a 45-degree tilted fluoride fiber Bragg grating for mid-infrared fiber laser technology Open
We report the direct femtosecond laser inscription of a 45° tilted fiber Bragg grating (TFBG) into fluoride fiber, creating an in-fiber mid-infrared polarizer. Utilizing a 16 mm long intracavity TFBG, we demonstrate a 2.862 μm Ho3+Pr3+:ZBL…
View article: Low-dimensional nanomaterial saturable absorbers for ultrashort-pulsed waveguide lasers
Low-dimensional nanomaterial saturable absorbers for ultrashort-pulsed waveguide lasers Open
A wide range of saturable absorbers composed of novel low-dimensional nanomaterials were fabricated, and their linear and nonlinear optical properties were characterized. Furthermore, their suitability for ultrashort-pulse generation in wa…
View article: Direct inscription of Bragg gratings into coated fluoride fibers for widely tunable and robust mid-infrared lasers
Direct inscription of Bragg gratings into coated fluoride fibers for widely tunable and robust mid-infrared lasers Open
We report the development of a widely tunable all-fiber mid-infrared laser system based on a mechanically robust fiber Bragg grating (FBG) which was inscribed through the polymer coating of a Ho3+-Pr3+ co-doped double clad ZBLAN fluoride f…
View article: Toward all-fiber supercontinuum spanning the mid-infrared
Toward all-fiber supercontinuum spanning the mid-infrared Open
Broadband laser light sources in the mid-infrared region attract enormous interest due to the plethora of applications they are enabling, including multispecies trace gas detection, free-space communications, and infrared countermeasures. …
View article: Compact integrated actively Q-switched waveguide laser
Compact integrated actively Q-switched waveguide laser Open
A miniaturized deformed helix ferroelectric liquid crystal transducer cell was used in combination with a femtosecond laser inscribed active waveguide to realize a compact actively Q-switched laser source. The liquid crystal cell was contr…
View article: High-power mid-infrared femtosecond fiber laser in the water vapor transmission window
High-power mid-infrared femtosecond fiber laser in the water vapor transmission window Open
The recent demonstrations of ultrafast mid-infrared fiber lasers emitting sub-picosecond pulses at 2.8 μm have created an exciting potential for a range of applications including mid-infrared frequency combs and materials processing. So fa…
View article: Direct infrared femtosecond laser inscription of chirped fiber Bragg gratings
Direct infrared femtosecond laser inscription of chirped fiber Bragg gratings Open
We compare and contrast novel techniques for the fabrication of chirped broadband fiber Bragg gratings by ultrafast laser inscription. These methods enable the inscription of gratings with flexible period profiles and thus tailored reflect…
View article: Actively Q-Switched integrated waveguide lasers
Actively Q-Switched integrated waveguide lasers Open
Actively Q-Switched lasers typically require bulky optical components. By incorporating a novel liquid crystal cell into a waveguide laser cavity, an all integrated and monolithic short-pulsed laser can be realized.