A5016442505- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Optical Network Technologies
- Photonic and Optical Devices
- Solid State Laser Technologies
- Neural Networks and Reservoir Computing
- Astronomical Observations and Instrumentation
- Semiconductor Quantum Structures and Devices
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Optic Sensors
- Quantum Computing Algorithms and Architecture
- Quantum Information and Cryptography
- Mechanical and Optical Resonators
- Calibration and Measurement Techniques
- Glass properties and applications
- Quantum and electron transport phenomena
- Photonic Crystals and Applications
- Spectroscopy and Laser Applications
- Strong Light-Matter Interactions
- Nonlinear Dynamics and Pattern Formation
- Particle Detector Development and Performance
- Physics of Superconductivity and Magnetism
- Terahertz technology and applications
- Laser-Matter Interactions and Applications
- Astronomy and Astrophysical Research
Vietnam National University Ho Chi Minh City
2025
Ho Chi Minh City University of Science
2025
Corning (United States)
2019-2024
Research & Development Corporation
2020
University of Arizona
2000-2019
NP Photonics (United States)
2007-2016
Micron (United States)
2014-2016
University of Stuttgart
2016
Université Paris Cité
2013
Centre National de la Recherche Scientifique
2013
The dependence of erbium-doped fiber amplifier (EDFA) performance on the erbium ion concentration is studied experimentally and theoretically. quantum efficiency found to he strongly dependent concentration, signal wavelength, relative propagation direction pump beams. This fully explained by presence an upconversion mechanism between ions residing in pairs or larger clusters suggests that other sources degradation (back-ground loss, excited state absorption, homogenous upconversion) are...
The tight-binding electronic structure of two-dimensional quasicrystals is studied numerically for three patterns Penrose tiling with up to 426 vertices. According the range interactions, different models are considered. For simplest model, two interactions assigned long and short edges tile. Energy spectra show several significant gaps whose width position depend on relative strength interactions. cumulative density states linear in energy at band edge, indicating existence Van Hove...
A planar floating-gate NAND technology has previously realized a 0.87Gb/mm2 memory density using 3b/cell [1] and achieved minimum feature size for 16nm [2]. However, the development of flash is expected to reach scaling limit in few generations. To break though this limit, significant shift 3D begun several types cell structures have been proposed discussed [3–5]. Recently V-NAND 1.86Gb/mm2 charge-trap cells [6]. This paper presents utilizing floating gate (FG) that achieves 4.29Gb/mm2.
Abstract Combinatorial optimization problems over large and complex systems have many applications in social networks, image processing, artificial intelligence, computational biology a variety of other areas. Finding the optimized solution for such general are usually non-deterministic polynomial time (NP)-hard complexity class. Some NP-hard can be easily mapped to minimizing an Ising energy function. Here, we present analog all-optical implementation coherent machine (CIM) based on network...
We demonstrate a high-stimulated-Brillouin-scattering-threshold monolithic pulsed fiber laser in master oscillator power amplifier configuration that can operate over the C band. In stage, we used newly developed single-mode, polarization maintaining, and highly Er/Yb codoped phosphate with core diameter of 25 microm. A single-frequency actively Q-switched was to generate pulses hundreds nanoseconds at 1530 nm. have achieved peak 1.2 kW for 105 ns repetition rate 8 kHz, corresponding pulse...
Based on highly Er/Yb codoped phosphate fibers, we have implemented all-fiber-based narrow-linewidth single-mode (SM) pulsed fiber lasers in master oscillator and power amplifier configuration. Two approaches were used to achieve the laser seeds: 1) an active <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> -switched using actuator 2) a directly modulated single-frequency continuous-wave laser. Both seed pulses from two transform-limited...
Mid-infrared sources are a key enabling technology for various applications such as remote chemical sensing, defense communications and countermeasures, bio-photonic diagnostics therapeutics. Conventional mid-IR include optical parametric amplifiers, quantum cascade lasers, synchrotron free electron lasers. An all-fiber approach to generate high power, single mode beam with extremely wide (1μm-5μm) simultaneous wavelength coverage has significant advantages in terms of reliability (no moving...
The aggressive scaling of NAND Flash memory technology — one that is even outpacing Moore's Law has enabled very rapid cost-per-bit reduction, resulting in an explosion systems utilizing this versatile technology. From removable media and personal music players to smart phones, tablets, now computers data center applications employing client enterprise solid state drives (SSDs), making solid-state memory-based storage affordable.
We report a unique all fiber-based single-frequency Q-switched laser in monolithic master oscillator power amplifier configuration at ∼1920 nm by using highly Tm-doped germanate fibers for the first time. The actively fiber seed was achieved piezo to press Bragg grating cavity and modulate birefringence, enabling Q-switching with pulse width repetition rate tunability. A single-mode polarization maintaining large core 25 μm used stage. For 80 ns pulses 20 kHz rate, we 220 μJ energy, which...
Thin films made from a composite of the polymer polyvinyl-alcohol and cobalt oxide (Co3O4) nanoparticles were fabricated by spin coating. Linear nonlinear optical properties thin with thicknesses hundreds nanometers investigated. The refractive index absorption coefficient measured two direct band gaps (Eg = 1.38 eV 2.0 eV) determined spectrum. Reversed saturable observed when illuminated different fluences. Optical nonlinearities corresponding to reverse z-scan technique. A (n2) ~10−10...
A single-frequency distributed Bragg reflector (DBR) fiber laser at 976 nm was developed with a 2 cm long highly ytterbium-doped phosphate and pair of silica gratings. More than 100 mW linearly polarized output achieved from the all-fiber DBR linewidth less 3 kHz. The outstanding features this also include ultralow relative intensity noise high wavelength stability. This is an excellent seeder for high-power narrow-linewidth amplifiers that can be used efficient coherent blue-light...
Abstract This study synthesized bismuth orthovanadate (BiVO 4 ) powders as yellow and near‐infrared reflective pigments using a modified ethylene glycol‐assisted colloidal method at various calcination temperatures. The pigment samples were characterized X‐ray diffraction, scanning electron microscopy, UV–visible absorption spectroscopy, reflection energy‐dispersive spectroscopy. Additionally, the color of was evaluated CIE L*a*b* space, their photocatalytic activity assessed via degradation...
We have developed a compact and stable all-fiber fundamentally mode-locked 12 GHz laser system. The passively centered at 1535 nm has temporal pulse width of ∼2 ps average power 5 mW. timing jitter, which is cumulative from pulse-to-pulse, been measured using an optical cross-correlation method found to be 44 fs/pulse. self-starting, consists semiconductor-based saturable absorber with high modulation depth gain per unit length, polarization-maintaining 0.8 cm long Er/Yb phosphate fiber as medium.
We present a detailed experimental parameter study on mid-IR supercontinuum generation in W-type index tellurite fibers, which reveals how the core diameter, pump wavelength, fiber length, and power dramatically influence spectral broadening. As source, we use femtosecond pulses from post-amplified optical parametric oscillator tunable between 1.7 μm 4.1 at 43 MHz repetition rate. are able to generate red-shifted dispersive waves up wavelength of 5.1 by pumping anomalous dispersion regime...
We present a new modeling method for cladding-pumped highly Er-Yb co-doped fiber amplifiers. The combines the beam propagation (BPM) field and nonlinear rate equations laser medium. pump absorption, which is obtained numerically from equations, used in BPM calculations of propagation. As result, our can effectively deal with difficult issues such as multimode nature cladding pumped schemes even complicated structures, well strong nonlinearities Er-Yb-doped simulation results are very good...
A distributed feedback fiber laser made of highly Er-Yb codoped phosphate glass has been demonstrated experimentally. Efficient pump absorption allows for multimode pumping into the cladding active fiber. Output powers up to 160 mW have achieved. The 35 mm long device emits with >50 dB side mode suppression ratio.
The nonlinear optical performance of specially designed periodic structures made from composites polymers and Co3O4 nanoparticles is investigated. refractive indices the alternating layers are to be close no photonic band gap (PBG) formed at low power density. Under high illumination, index difference becomes large because nonlinearities nanoparticles. Consequently, enhanced obtained with formation strengthening PBG. Nonlinear reflection transmission as well reduced threshold observed in PBG...
Label-free, single-object sensing with a microring resonator is investigated numerically using the finite difference time-domain (FDTD) method. A pulse ultra-wide bandwidth that spans over several resonant modes of ring and object used for simulation, enabling single-shot simulation sensing. The FDTD not only can describe circulation light in whispering-gallery-mode (WGM) multiple interactions between object, but also other important factors system, such as scattering radiation losses....
A monolithic fiber chirped pulse amplification system that generates sub-500 fs pulses with 913 µJ energy and 4.4 W average power at 1.55 µm wavelength has recently been demonstrated. The estimated peak for the output approached 1.9 GW. were near diffraction-limited transform-limited, benefiting from straight short length of booster amplifier as well adaptive phase shaping overall mitigation nonlinear accumulation. employs an Er(3+)-doped large mode area high efficiency media just 28 cm in a...
Mid Infrared (MIR) fiber optics has gained a great deal of interest over the past several decades. Applications range from passive transport to lasers and nonlinear applications. These fibers have found use in wide array fields such as sensing, military countermeasures, scientific instrumentation, medical research laboratories. As with all development there is continual urge seek better performance characteristics including transparency wavelength range, corrosion resistance, high power...
A novel monolithic fiber-optic chirped pulse amplification (CPA) system for high energy, femtosecond generation is proposed and experimentally demonstrated. By employing a gain amplifier comprising merely 20 cm of efficiency media (HEM) fiber, an optimal balance output optical efficiency, B-integral achieved. The HEM fabricated from erbium-doped phosphate glass fiber yields 1.443 dB/cm with slope >45%. We demonstrate near diffraction-limited beam quality transform-limited at 1.55 µm...
New quasi-periodic arrays of waveguides (AWs) constructed with Fibonacci sequences are proposed to realize localized quantum walks (LQWs). The (FAWs) simple and straightforward make, but have a rich set properties that potential use for applications in communication. Our simulations show that, contrast randomly disordered AWs, LQWs FAWs highly controllable due the deterministic disorder nature systems. Furthermore, unique symmetrical probability distribution can be conveniently realized FAWs.
We demonstrate a resonant external cavity approach to enhance narrowband terahertz radiation through difference-frequency generation for the first time (to our knowledge). Two nanosecond laser pulses in an optical interact with nonlinear crystal produce factor of 7 enhancement power compared single-pass orientation. This shows promise significantly increase both and conversion efficiency pump pulse effective recycling.