A5078046171- Laser Material Processing Techniques
- Advanced Surface Polishing Techniques
- Laser-induced spectroscopy and plasma
- Diamond and Carbon-based Materials Research
- Surface Roughness and Optical Measurements
- Laser-Ablation Synthesis of Nanoparticles
- Metallic Glasses and Amorphous Alloys
- Additive Manufacturing Materials and Processes
- Orbital Angular Momentum in Optics
- Additive Manufacturing and 3D Printing Technologies
- Microstructure and mechanical properties
- Advanced materials and composites
- Electrical Fault Detection and Protection
- ZnO doping and properties
- Titanium Alloys Microstructure and Properties
- Ocular and Laser Science Research
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced machining processes and optimization
- Optical Coherence Tomography Applications
- High Entropy Alloys Studies
- Electrical Contact Performance and Analysis
Southern University of Science and Technology
2019-2024
Shanghai Jiao Tong University
2017
South China University of Technology
2011
Abstract Liquid-assisted laser ablation has the advantage of relieving thermal effects common processes, whereas light scattering and shielding by laser-induced cavitation bubbles, suspended debris, turbulent liquid flow generally deteriorate beam transmission stability, leading to low energy efficiency poor surface quality. Here, we report that a continuous directional high-speed microjet will form in zone if primary bubbles asymmetrically collapse sequentially near air-liquid interface...
Abstract Hierarchical micro/nanostructures have garnered considerable attention for their capabilities in light modulation, but the flexible fabrication of designed optical functional structures at both micro and nano scales remains challenging. Here, a polarization‐modulated patterned laser ablation method complemented by flowing liquid is proposed to fabricate hierarchical microgrooves featuring tunable cross‐sections engraved surface nanostructures with controllable periods orientations....
Abstract Fabricating precision microgrooves with controllable cross‐sections on difficult‐to‐machine materials is significantly valuable but still challenging. Herein, a patterned laser‐induced microjet‐assisted ablation method for cross‐sectional profiles laser micromachining proposed. During the liquid‐assisted process, debris and bubbles that may disturb energy deposition can be instantaneously expelled by directional microjet. The Gaussian spot spatially modulated into specific geometric...
In this study, we propose a polarization-modulated laser-induced microjet-assisted ablation method for machining microgrooves with controllable cross-sections. A novel mathematical model is presented to accurately predict the cross-sections by considering combined effects of polarization and secondary ablation. The simulation experimental results reveal that effect becomes more obvious when steeper grooves are ablated higher repetition frequency larger pulse energy. target material result in...
Nano‐ZnO powder was synthesized by the plasma vapor‐phase reaction (PVPR) process. Most of ZnO particles obtained are rod‐like, with diameters between 20 and 100 nm. ZnO‐based varistors were fabricated using nano‐ZnO commercial French process submicrometer powder, respectively. The sintering activity samples prepared is higher, but there only a little difference mean grain sizes sintered at same temperature. current–voltage ( I–V ) characteristics in low‐current region similar. However, when...
A preliminary investigation of the post heat treatment for Ti6Al4V tensile specimens fabricated via selective laser melting (SLM) are reported. The resultant microstructure and mechanical behavior at room temperature, normal parallel to building direction, was investigated in detail. Moreover, as-prepared samples were compared with treated 600°C~800°C 2 h. It found that SLM consisted long columnar original β grains together acicular α' martensitic structure dominated matrix, which observed...
NiP coating with an amorphous structure is a commonly used mold material for manufacturing resin optical components. However, due to the inhomogeneous deformation characteristics of alloys, chippings and burrs are easily produced at edge microstructures. Laser-assisted microcutting has proven effectively inhibit generation these defects but evolution chip-deformation mechanisms different laser power remains be explored. In this study, simulation temperature field under nanosecond irradiation...
The surface modification by ultra-fast laser could regulate the mechanical properties of hard and brittle materials. Since silicon carbide (SiC) is too to be machined with acceptable removal rate quality abrasives, femtosecond (fs-laser) assisted grinding a potential method improve machinability SiC. Under fs-laser modulating, SiC modified generate laser-induced periodic structures (LIPSS). Understanding material mechanism LIPPS crucial accomplish high efficiency machining process. This...