A5052821899- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Solid State Laser Technologies
- Semiconductor Lasers and Optical Devices
- Photorefractive and Nonlinear Optics
- Mechanical and Optical Resonators
- Laser-Matter Interactions and Applications
- Diamond and Carbon-based Materials Research
- Photonic Crystal and Fiber Optics
- Geophysics and Sensor Technology
- Analytical Chemistry and Sensors
- Brake Systems and Friction Analysis
- Quantum optics and atomic interactions
- Facial Trauma and Fracture Management
- Conducting polymers and applications
- Gas Sensing Nanomaterials and Sensors
- Spectroscopy and Laser Applications
- Microwave and Dielectric Measurement Techniques
- Railway Engineering and Dynamics
- Silicon Carbide Semiconductor Technologies
- Tribology and Wear Analysis
- Magnetic Field Sensors Techniques
- Advanced Frequency and Time Standards
- Laser-Ablation Synthesis of Nanoparticles
Hebei University of Technology
2019-2024
Advanced Laser Technology (United Kingdom)
2022-2024
Macquarie University
2023
South China Normal University
2023
Yangzhou University
2014-2020
Hong Kong Polytechnic University
2020
Harbin Institute of Technology
2018
Nanshan Group (China)
2017
Jilin Medical University
2014
Delayed self-heterodyne interferometry is a commonly used technique for the measurement of laser linewidth. It typically requires use very long delay fiber when measuring narrow linewidth (especially linewidths in kHz-range) lasers. The fibers can result system losses and introduction 1/f noise that causes spectral line broadening. In this paper, we present calculation method processing output delayed setup using short length fiber, to determine makes pairs data points (corresponding...
Stimulated Brillouin scattering (SBS), with its advantages of low quantum defect and narrow gain bandwidth, has recently enabled an exciting path toward narrow-linewidth low-noise lasers. Whereas almost all work to date been in guided-wave configurations, adaptation unguided lasers (BLs) offers a greater capacity for power scaling, cascaded Stokes control, flexibility expanding wavelength range. Here, we report diamond laser (DBL) employing doubly resonant technology at 1064 nm. output 22.5...
Abstract The stimulated Brillouin scattering phase conjugation mirror (SBS-PCM) based on liquid media is widely used in high-power laser systems due to its robust thermal load capacity, high energy conversion efficiency and improved beam quality. Nevertheless, with an increase the pump repetition rate, thermally-induced blooming optical breakdown can emerge, leading distortions Stokes beam. In this study, we delved into effects SBS-PCMs employing hydrodynamic analysis, establishing a...
A screening method is reported for electro-optic (EO) polymers with an emphasis on broadband device suitability. The based comparing the signal from second harmonic generation (SHG) and leak through current (LTC) during poling. Plots of SHG LTC are used to define high EO activity-low poling windows that critical low driving voltage, devices relatively optical loss. procedure was select polymer core resulted in a 40Gbits∕s modulator voltage 1.3V insertion loss <8dB.
Delayed self-heterodyne/homodyne measurements based on an unbalanced interferometer are the most used methods for measuring linewidth of narrow-linewidth lasers. They typically require service a delay six times (or greater) than laser coherence time to guarantee Lorentzian characteristics beat notes. Otherwise, notes displayed as coherent envelope. The cannot be directly determined from However, narrow linewidths using traditional introduces significant errors due 1/
Free-space Brillouin lasers (BLs) are capable of generating high-power, narrow-linewidth laser outputs at specific wavelengths. Although there have been impressive experimental demonstrations these lasers, is an absence a corresponding theory that describes the dynamic processes occur within them. This paper presents time-independent analytical model generation first-order Stokes field free-space BLs. based on cavity resonance enhancement and coupled wave equations govern stimulated...
The pulse duration of the near quarter-acoustic period (τa) is demonstrated in transient stimulated Brillouin scattering (SBS) compression by suppressing Stokes trailing-edge broadening at high intensities. A theoretical analysis reveals that difficulty attaining limit caused trailing edge owing to insufficient pump depletion, and this undesirable phenomenon can be significantly suppressed a SBS gain coefficient. An average ∼1.05 τa was experimentally achieved with high-energy efficiency...
A high temporal waveform fidelity stimulated Brillouin scattering phase conjugate mirror (SBS-PCM) with energy efficiency, based on a novel medium, Novec-7500, is proposed and practically achieved in this study. theoretical analysis reveals that the temporal-domain distortion caused by inherent pulse duration compression effect of SBS, undesirable phenomenon can be significantly suppressed decreasing coefficient (CC afterwards), which defined as gain divided phonon lifetime, identified key...
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Stimulated Raman scattering, as a third-order nonlinear effect, is an effective approach to expand the laser spectral region. To obtain high power output of with specific wavelength, novel gain media and structures have been continuously studied, in recent years, diamonds received increased interest from researchers owing their extremely coefficient, thermal conductivity, wide transmission spectrum. Diamond lasers (DRLs) enabled achievement input visible mid-infrared band. In particular,...
Repetition rate-tunable single-longitudinal-mode (SLM) lasers are in wide demand for light detection and ranging. This study proposes an SLM acoustic-optical Q-switched Nd:YVO4 laser based on a short-cavity scheme. The system consists of diode (LD) pump source, coupling optics, input mirror coupler (IC), crystal, acousto-optic Q-switching (AOQS), output (OC). mode selection is theoretically analyzed confirmed from the experimental setup. obtains 10 ns pulse duration, with linewidth 279.43...
F4 (K88) and F18 fimbriaed enterotoxigenic Escherichia coli (ETEC) are the predominant causes of porcine postweaning diarrhea (PWD), vaccines considered most effective preventive approach against PWD. Since heterologous DNA integrated into bacterial chromosomes could be effectively expressed with stable inheritance, we chose probiotic EcNc (E. Nissle 1917 prototype cured cryptic plasmids) as a delivery vector to express or both fimbriae sequentially assessed their immune efficacy anti-F4 in...
A new stimulated Brillouin scattering (SBS) compression mechanism, quasi-steady-state SBS compression, in which the limit is one-tenth of phonon lifetime with a high energy efficiency, proposed and practically realized this study. The feasibility approach demonstrated experimentally, 0.36τB an efficiency 65% achieved 3M Fluorinert Electronic Liquid FC-3283 output 0.12τB (near-compression-limited) above 40% obtained acetone when to leading-edge ratio greater than 10. This identified...
The cascade operation of Brillouin lasers (BLs) is an identified obstacle to single-frequency power scaling and further compression the fundamental linewidth. In this study, we reveal relationship between maximum order system parameters, starting from phase-matching conditions Stokes cascade. second suppressed for modes that fall away gain linewidth (ΓB), which heightened media with high sound velocity, large refractive index, narrow Diamond, its extremely product speed satisfies these...
Free-space Brillouin lasers (BLs) generate high-power narrow-linewidth laser outputs at specific wavelengths. However, despite these impressive results, further compressing the Stokes linewidth while maintaining a output remains challenge. This study was conducted to investigate design of BLs, starting from phase-matching conditions and stability cavity, for media with different phonon frequencies. A can be realized using large-size, wide-gain-bandwidth media. We experimentally demonstrated...
Lasers with narrow linewidths and single frequencies are widely used in fields such as radar detection, nonlinear optics, precision measurements. The demand for lasers has promoted the rapid development of single-longitudinal-mode (SLM) selection technology. Here, we highlight working principles current mainstream SLM technologies recent advances field. We compare characteristics different methods list challenges faced by these technologies.
A variable optical attenuator (VOA) based on a metal-defined polymeric waveguide has been demonstrated for the first time. The metal film stressor deposited top of upper cladding layer not only produces refractive index change within core layer, but also acts as thin-film heater allowing thermal tuning power waveguide. Fabricated devices exhibit greater than 25 dB attenuation with an applied electrical current /spl sim/40 mA at 1550-nm wavelength. switching speed VOA exhibits 800 μs rising...