A5043931929- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Photonic and Optical Devices
- Optical Network Technologies
- Laser-Matter Interactions and Applications
- Advanced Fiber Optic Sensors
- Neural Networks and Reservoir Computing
- Mechanical and Optical Resonators
- Solid State Laser Technologies
- Carbon Nanotubes in Composites
- Photonic Crystals and Applications
- Silicon Nanostructures and Photoluminescence
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Phase-change materials and chalcogenides
- Laser Design and Applications
- GaN-based semiconductor devices and materials
- Quantum-Dot Cellular Automata
- Semiconductor Quantum Structures and Devices
- Model Reduction and Neural Networks
- Magneto-Optical Properties and Applications
- Chalcogenide Semiconductor Thin Films
- Computer Graphics and Visualization Techniques
- Ga2O3 and related materials
- Quantum Dots Synthesis And Properties
McGill University
2017-2024
Institut National de la Recherche Scientifique
2023-2024
Karlsruhe Institute of Technology
2020
Ahsanullah University of Science and Technology
2013
Broadband laser light sources in the mid-infrared region attract enormous interest due to plethora of applications they are enabling, including multispecies trace gas detection, free-space communications, and infrared countermeasures. Key progress supercontinuum generation has been wide availability fiber-based near-infrared bulk-optic pump suitably engineered nonlinear media capable supporting high-brightness supercontinua. A large proportion system complexity relates source itself with...
Abstract Microcavities enable the generation of highly efficient microcombs, which find applications in various domains, such as high-precision metrology, sensing, and telecommunications. Such generally require precise control over spectral features free range, envelope, bandwidth. Most existing methods for customizing microcomb still rely on manual exploration a large parameter space, often lacking practicality versatility. In this work, we propose smart approach that employs genetic...
Mode-locking techniques have played a pivotal role in developing and advancing laser technology. Stable fiber-cavity configurations can generate trains of pulses spanning from MHz to GHz speeds, which are fundamental various applications micromachining, spectroscopy, communications. However, the generation exploitation multiple timescales single cavity configuration remain unexplored. Our work demonstrates designed control pulse nanosecond picosecond with broadband output low mode-locking...
Abstract Alloys of sulfur, selenium and tellurium, often referred to as chalcogenide semiconductors, offer a highly versatile, compositionally-controllable material platform for variety passive active photonic applications. They are optically nonlinear, photoconductive materials with wide transmission windows that present various high- low-index dielectric, low-epsilon plasmonic properties across ultra-violet, visible infrared frequencies, in addition an, non-volatile, electrically/optically...
Abstract We present a coherent supercontinuum (SC) spanning 1.1-3.9 µm wavelength range from propagation in three-stage cascade of nonlinear and dispersive fibers, including silica fiber, ZBLAN robust dispersion-engineered As2S3 microtaper. In the first stage made pump pulse undergoes soliton fission, creating fundamental that subsequently redshifts through SSFS to center 2.14 μm. second becomes higher order experiences round fission another would shift up 2.86 via SSFS. third stage,...
Emerging applications in the mid-infrared (MIR) stimulate growth and development of novel optical light sources. Soliton self-frequency shift (SSFS) soft glass fiber currently shows great potential as an efficient approach toward generation broadly tunable femtosecond pulses MIR. In this work, we demonstrate a highly soliton source based on SSFS chalcogenide glass. We show simple fully fiberized system to generate these continuously Raman solitons over broad spectral range 2.047-2.667 µm,...
We demonstrate an all-fiber wavelength conversion system from the C-band to range of 2.30-2.64 µm mid-infrared (MIR). A series nonlinear processes is used perform this spectral shift in excess 80 THz; optical pulses C-band, self-phase modulation broadening and offset filtering generate probe C- L-band. In parallel this, Raman-induced soliton self-frequency converts into pump 2 band. The resulting synchronized interact via degenerate four-wave mixing produce wavelength-converted idler MIR....
We demonstrate a thulium-doped fiber laser that is mode-locked thanks to nonlinear polarization rotation (NPR) in chalcogenide tapered fiber. The high nonlinearity of the leads combined reduction mode-locking threshold power and cavity length compared any all-silica NPR based lasers. In continuous wave regime, generates stable, tunable solitons pulses. Q-switched it allows single multiwavelength pulses, central wavelength separation.
We demonstrate an in situ approach for the fabrication of all-fiber wavelength converters with a offset that is both far-detuned and precisely engineered. Such are fabricated using parametric gain A2Se3 microwires finely tuned from successive adjustments microwire diameter along real-time monitoring. Wavelength conversion achieved pump at 1.938 μm to any idler within spectral range 2.347-2.481 μm, resulting detuning 27.0-33.9 THz precision 3.1 THz.
Fiber optical parametric oscillators (FOPOs) are compact sources of coherent and broadly tunable light compatible with operation in unconventional spectral bands. Highly nonlinear silica fibers have enabled the development FOPOs telecommunication wavelength band, but strong material absorption glass at wavelengths >2 µm limits its applicability mid-infrared (MIR) range. In this work, we overcome issue report a FOPO designed entirely out soft fiber. For purpose, combine an As2Se3 single-mode...
Synthetic dimensions (SDs) opened the door for exploring previously inaccessible phenomena in high-dimensional space. However, construction of synthetic lattices with desired coupling properties is a challenging and unintuitive task. Here, we use deep learning artificial neural networks (ANNs) to construct real space predesigned spectrum mode eigenvalues, thus validly design dynamics dimensions. By employing judiciously chosen perturbations (wiggling waveguides at frequencies), show resonant...
We demonstrate a mid-infrared compatible tunable bandpass filter that consists of singlemode-multimode-singlemode fiber structure, made from chalcogenide fibers. Experiments have been carried out using step-index multimode fibers with small core radius, resulting in continuous wavelength tunability >52 nm and hop 84 nm, via mechanical bending. Core to lateral offsets at input output interfaces between singlemode are optimized maximize the extinction ratio set desired transmission wavelength....
Single-walled carbon nanotubes as emerging quantum-light sources may fill a technological gap in silicon photonics due to their potential use near-infrared, electrically driven, classical or nonclassical emitters. Unlike photoluminescence, where are excited with light, electrical excitation of single tubes is challenging and heavily influenced by device fabrication, architecture, biasing conditions. Here we present electroluminescence spectroscopy data ultra-short-channel devices made from...
Fiber-based wavelength converters employing soliton self-frequency shift (SSFS) are particularly attractive as tunable mid-infrared (MIR) sources due to their compact design and robust nature. Early attempts of conversion utilizing SSFS in the MIR spectral region involved cascading silica fluoride nonlinear fibers (NLFs). In this work, we take a step forward demonstrate cascade involving three types NLFs made different glasses, that is, silica, fluoride, chalcogenide (ChG). Due its high...
We present a soliton order preservation mechanism leading to broad tunability with high energy conversion efficiency (ECE) from fiber-based self-frequency shift (SSFS) system. Here, pulse compressing fiber, placed before the Raman shifting nonlinear fiber (NLF), acts as preserver. Thanks this passive mechanism, at input of NLF is preserved within 2.0 < <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N</i> 2.3 despite ∼6.7-fold increase. The...
We report, to the best of our knowledge, first all-fiber frequency-resolved optical gating device from nonlinear processing in chalcogenide glass. The strong four-wave mixing efficiency an 11 cm long microwire enables a high sensitivity characterization pulses 2 μm wavelength band. amplitude and phase chirped unchirped picosecond are accurately characterized with 0.16 mW2.
We report, to the best of our knowledge, first all-fiber frequency-resolved optical gating (FROG) device based on cross-phase modulation in chalcogenide glass. The amplitude and phase pulses as short 390 fs at femtojoule energy levels are accurately characterized without direction-of-time ambiguity retrieved pulse. A measurement sensitivity 18 mW2 is achieved from strong nonlinearity a 10 cm long microwire.
We present a novel approach to robustly tailor microcomb states in microring resonators pumped with continuous-wave laser source, employing genetic algorithms optimize the parameters required for coherent state generation.
We report our observation of carrier dispersion effect in a silicon strip waveguide and demonstrated novel waveguide-based modulator with an estimated half-wave-voltage-length product (V π L) 9 V.cm the telecommunication wavelength.
We propose and demonstrate a scheme for light manipulation in synthetic mode dimensions with deep learning, leading to unusual dynamics and, particularly, the morphing of into topological modes an ANN-designed photonic platform.
We demonstrate an ultra-stable, tunable mode-locked laser cavity featuring a nested microring resonator for generating and switching between different repetition rates. Our approach offers solution spectroscopy, metrology, communications applications.
We present an all-fiber supercontinuum source spanning over the spectral range of 1.2-3.9 µm from As 2 S 3 -polycarbonate hybrid microtaper. This is broadest obtained a robust polymer clad