A5100632545- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Optical measurement and interference techniques
- Solid State Laser Technologies
- Laser Material Processing Techniques
- Surface Roughness and Optical Measurements
- Terahertz technology and applications
- Advanced Measurement and Metrology Techniques
- Photorefractive and Nonlinear Optics
- Advanced Surface Polishing Techniques
- Photonic and Optical Devices
- Optical Systems and Laser Technology
- Advanced optical system design
- Nonlinear Optical Materials Studies
- Photonic Crystal and Fiber Optics
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- Superconducting and THz Device Technology
- Power Transformer Diagnostics and Insulation
- Advancements in PLL and VCO Technologies
- Wave and Wind Energy Systems
- Advanced machining processes and optimization
- HVDC Systems and Fault Protection
- Image Processing Techniques and Applications
- Frequency Control in Power Systems
University of Shanghai for Science and Technology
2020-2025
Fudan University
2021-2024
Southeast University
2023-2024
Hong Kong Polytechnic University
2020-2024
Fiberhome Technology Group (China)
2024
State Key Laboratory of Crystal Materials
2019-2023
Shandong University
2019-2023
China Southern Power Grid (China)
2023
Nanchang Institute of Technology
2023
Philippine Christian University
2023
Optical waveguides are far more than mere connecting elements in integrated optical systems and circuits. Benefiting from their high confinement miniaturized footprints, waveguide structures established based on crystalline materials, particularly, opening exciting possibilities opportunities photonic chips by facilitating on-chip integration with different functionalities highly compact Femtosecond-laser-direct writing (FsLDW), as a true three-dimensional (3D) micromachining...
Abstract The applications of silica-based glass have evolved alongside human civilization for thousands years. High-precision manufacturing three-dimensional (3D) fused silica objects is required in various industries, ranging from everyday life to cutting-edge fields. Advanced 3D printing technologies emerged as a potent tool fabricating arbitrary with ultimate freedom and precision. Stereolithography femtosecond laser direct writing respectively achieved their resolutions ~50 μm ~100 nm....
This paper presents a simple method to realize circular polarizer by inserting dielectric septum in the middle of cylindrical waveguide. Since fixing slots are built precisely locate septum, dual-compensation made orthogonal plane balance effects slots. The measured axial ratio is smaller than 0.5 dB and phase difference flat frequency range from 60 62.25 GHz. In addition, return losses better -13 for both E/sub x/ y/ polarizations same range. design has added advantage that poor differences...
We report on the coherent control of boosted ultrashort terahertz pulses emitted from air plasma pumped by a femtosecond sawtooth pulse composed three optical harmonic fields. With an inline setup, relative phases between components pump can be varied independently with attosecond precision without complexity external phase stabilization. observe that amplitude emission phase-optimized wave is enhanced 1.8 times compared to widely used two-color scheme. Moreover, manipulating colors at...
We report a hybrid waveguide-grating vortex laser emitter processed based on femtosecond direct writing of the Nd:YVO4 crystal. The cladding waveguide together with fork grating features both excellent single-mode guidance and diffraction properties. confocal micro-Raman characterization results reveal mechanism periodic refractive index modulation grating. Vortex lasers at milliwatt level are achieved wavelength 1064.7 nm under optical pump 809.3 nm. numerical simulation near-field...
There are still significant challenges in the accurate and uniform manufacturing of microlens arrays (MLAs) with advanced ultra-precision diamond cutting technologies due to increasingly stringent requirements shape complexity. In this paper, an optimum machining process chain is proposed based on integration a micro-abrasive fluid jet polishing (MAFJP) improve quality by single point turning (SPDT). The MLAs were first machined compensated SPDT until maximum possible surface was obtained....
Strong-field terahertz (THz) light-matter interaction provides various nonlinear control approaches in condensed matter physics, energy and material sciences, electron acceleration, manipulation. Recently developed spintronic THz emission with minimum complexities has been demonstrated to have the capability for generating high field strengths. Up now, applications based on transients yet realized. Here, we report from two-color femtosecond laser plasma filaments modulated by a 60-kV/cm...
An effective built-in self-test (BIST) structure of a phase-locked loop (PLL) in digital applications is presented this paper. The proposed BIST can identify possible faults any block such as the phase detector, charge pump, filter, voltage-controlled oscillator and divide-by-N PLL. key advantage approach that it uses all existing blocks PLL for measuring testing, reducing chip area overhead. Restated, does not alter analog circuits. Rather, only adds some small circuits to requires slight...
Embedded copper nanoparticles (Cu NPs) with spherical geometry are synthesized by Cu+ ion implantation in lithium tantalate (LiTaO3) crystal. Because of the localized surface plasmon resonance (LSPR) effect, strong optical absorption visible light band has been observed LiTaO3 embedded Cu NPs. By changing fluence, diameter NPs and correlated linear responses could be tailored. The open-aperture ultrafast Z-scan measurement reveals that system also possesses saturable near-infrared band....
We report on the synthesis and features of copper (Cu) nanoparticles (NPs) embedded into LiNbO3 crystal. A linear optical absorption that peaked at 613 nm is observed, which correlates to localized surface plasmon resonance (LSPR) effect. In addition, Cu NPs (CuNP:LN) possesses ultrafast saturable properties a wavelength 1µm. Based these enhanced nonlinear properties, CuNP:LN applied as absorber (SA) for pulsed laser generation in waveguide system. Under an pump, 8.6 GHz fundamentally...
The non-null test to detect the modulated wavefront is a widely used method in optical freeform surface measurement. In this study, deformation of an measurement was corrected based on propagation model improve accuracy. A correction (FSWC) system established validate proposed method. Simulation and experimental studies indicated that can reduce influence space propagation. Moreover, form accuracy measured by FSWC reach root-mean-squared value 10 nm.
The thickness-dependent third-order nonlinear optical properties of two-dimensional β-InSe and its potential applications as a saturable absorber in pulsed laser generation are investigated. InSe sheets with different layers prepared by the chemical vapor deposition. Using open-aperture femtosecond Z-scan technique at 1030 nm, modulation depth absorption coefficient obtained to be 36% -1.6 × 104 cm·GW-1, respectively. intrinsic mechanism layer-dependent energy band structure evolution is...
We analyzed both experimentally and theoretically the spectrum of terahertz emission from air plasma excited by phase-controlled two-color femtosecond pulses. It was found that low frequency component (<5 THz) exhibits high energy modulation contrast (>90%) for varied phase shift between fundamental light field its second harmonic, while (5–20 just slightly modulated with shift. This proofs shape THz can be effectively tailored changing relative phase. To explain experimental...
We report a self- Q -switched mode-locked Nd:LGGG waveguide laser with tunable dual-wavelength emission fabricated by femtosecond direct writing (FsLDW). The delivers pulses minimum temporal duration of approximately 30 ps at fundamental repetition rate up to 8.03 GHz, without using any modulation element. maximum output power is determined be 226 mW slope efficiency 25.38%. This work indicates the promising applications lasers based on mixed crystals for integrated optics.
The paper presents three novel distribution-feeder models to simplify complicated distribution-system calculations. These equivalent are developed simulate the total series voltage drop at end of given feeder accurately, copper loss and a hybrid both accurately. In addition, all proposed bidirectional. This means that power infeed can be either model is accurate. contrast, unidirectional previously accurate only when specified by model. feature important for modern power-distribution system...