A5112745089- Laser Material Processing Techniques
- Advanced Surface Polishing Techniques
- Laser-Matter Interactions and Applications
- Thermoelastic and Magnetoelastic Phenomena
- Advanced Fiber Laser Technologies
- Ocular and Laser Science Research
- Optical Coherence Tomography Applications
- Photonic Crystal and Fiber Optics
- Photonic and Optical Devices
- Nonlocal and gradient elasticity in micro/nano structures
- Laser-induced spectroscopy and plasma
- Innovative Microfluidic and Catalytic Techniques Innovation
- Integrated Circuits and Semiconductor Failure Analysis
- Cultural Heritage Materials Analysis
- Laser-Plasma Interactions and Diagnostics
- Nanofabrication and Lithography Techniques
- Thermography and Photoacoustic Techniques
- Fuel Cells and Related Materials
- Advanced X-ray Imaging Techniques
- Advanced Memory and Neural Computing
- Advanced Fiber Optic Sensors
- Surface Roughness and Optical Measurements
- Electrocatalysts for Energy Conversion
- Solid State Laser Technologies
- Surface Modification and Superhydrophobicity
Hong Kong Polytechnic University
2025
Xi'an Jiaotong University
2019-2023
National University of Singapore
2021
University of Michigan
2007-2009
Microdroplet technology is widely used in biomedicine, material synthesis, and the petrochemical industry due to its unique biological mechanical properties. Silica glass has emerged as a key substrate for droplet microfluidic chips because of excellent physical, chemical, biocompatible characteristics. However, intrinsic hardness brittleness create significant challenges fabrication. This study investigates use femtosecond laser processing fabrication silica glass-based devices generation....
The present work is devoted to establishing the ultrashort pulse laser ablation generalized thermoelastic model with spatio-temporal nonlocal effect and investigating transient responses of process silicon ablated by picosecond laser. research divided into three cases. 1) solid before target surface melting studied, final state this case are taken as initial conditions Case Two. 2) liquid after researched, heat flux away vaporization considered in boundary condition. 3) discussed, moving...
In an effort to develop a robust and efficient front end for chirped-pulse parametric amplification chain, we demonstrate broadband difference-frequency converter driven by monolithic femtosecond Yb-doped-fiber amplifier emitting carrier-envelope-offset-free pulses with the energy of tens nanojoules tunable in wavelength range from 1200 nm beyond 2 mum. Next providing these seed pulses, system enables direct optical synchronization Nd- Yb-doped pump lasers subsequent amplification.
Photonic-crystal fibers (PCFs) with a specifically designed dispersion profile and nonlinearity are shown to enable an accurate broadband compensation of the stretcher-compressor in fiber laser sources high-peak-power ultrashort light pulses. We demonstrate that nonlinear phase shift such systems can partially compensate for fourth-order dispersion, allowing stretcher—compression group delay be compensated up terms by using sequence only two fibers—a standard optical PCF.
In this paper, the author demonstrate a drastically simplified seeding/synchronization approach based on an environmentally stable muJ-energy 200-fs, 100-kHz Yb-doped fiber amplifier (YDFA). It generates white light continuum in bulk sapphire, pumps distributed grating optical parametric (DFG OPA) and provides seed compatible with most Nd Yb ~1mum pump pulse amplifiers.
In this paper we report the first demonstration of efficient hard X-ray generation using a femtosecond fiber laser. The source has yield efficiencies similar to those obtained with solid state laser drivers comparable pulse energies and intensities. Further experiments on increasing efficiency higher from current system are in progress. Since technology is scalable >100-W average power opens path towards compact high-brightness sources for imaging time resolved diffraction experiments.
Femtosecond laser processing has been extensively used in micromachining, especially for the precision of hard and brittle materials. However, materials ablated by femtosecond is not easy to control. This paper reports an experimental theoretical study on ablation characteristics fused silica using high repetition rate laser. An microchannels milling was carried out. The influence pulse energy, rate, scanning velocity, times size morphology obtained. Simultaneously, data depth width under...