A5103013176- Laser Material Processing Techniques
- Laser-induced spectroscopy and plasma
- Ocular and Laser Science Research
- Laser-Ablation Synthesis of Nanoparticles
- Advanced Surface Polishing Techniques
- Surface Roughness and Optical Measurements
- Ultrasound and Cavitation Phenomena
- Electrohydrodynamics and Fluid Dynamics
- Solid State Laser Technologies
- Gold and Silver Nanoparticles Synthesis and Applications
- Force Microscopy Techniques and Applications
- Quantum Dots Synthesis And Properties
- Planetary Science and Exploration
- Glass properties and applications
- Optical Systems and Laser Technology
- Intermetallics and Advanced Alloy Properties
- Integrated Circuits and Semiconductor Failure Analysis
- Nonlinear Optical Materials Studies
- High Temperature Alloys and Creep
- Advanced Sensor Technologies Research
- Scientific Research and Discoveries
- Electromagnetic wave absorption materials
- Thermography and Photoacoustic Techniques
- Advanced Measurement and Metrology Techniques
- Thermodynamic and Structural Properties of Metals and Alloys
Nanjing University of Science and Technology
2015-2024
Dalian University of Technology
2021
Leibniz Institute of Surface Engineering
2015
A millisecond laser combined with a nanosecond was applied to machining transparent materials. The influences of delay between the two pulses on processing efficiencies and modified sizes were studied. In addition, laser-supported combustion wave (LSCW) captured during irradiation. An optimal corresponding highest efficiency found for cone-shaped cavities. size as well lifetime intensity LSCW increased decreasing. Thermal cooperation effects defects, overlapping small sites, thermal...
A new form of double pulse composed a nanosecond laser and millisecond is proposed for machining transparent materials. To evaluate its advantages disadvantages, experimental investigations are carried out the corresponding results compared with those single laser. The mechanism discussed from two aspects: material defects effects modifications induced by on thermal stress field during irradiation. It shown that sample generated improves processing efficiency subsequent laser, while limits...
The laser–silicon interaction process was investigated with the superposed radiation of two pulsed Nd:YAG lasers. A pulse duration 1 millisecond (ms) by 7 nanosecond (ns) pulses, creating a combined laser (CPL). time-resolved surface temperature silicon measured an infrared pyrometer. melting thresholds were attained for single ms and CPL radiometry reflectance. concept threshold boundary proposed, fitted curve obtained. An axisymmetric model established heating silicon. transient fields...
The surface damage morphologies of single-crystal silicon induced by a combined pulse laser (CPL) and single millisecond are investigated, respectively. CPL includes (ms) superposed nanosecond (ns) laser. Inspected an optical microscope, it was found that the more serious when sample irradiated than ms with same incident energy. Besides cleavage, obvious ablation fold areas were discovered irradiation. A two-dimensional spatial axisymmetric model established to assess difference between...
Abstract A total‐Lagrangian material point method (TLMPM) with a mixed formulation is proposed in this article for the mechanical analysis of incompressible soft materials coupling mass growth and massive deformation. In work, growth‐induced large deformation behavior handled within framework (MPM) based on multiplicative decomposition gradient. To overcome volumetric locking caused by incompressibility materials, weak‐form equation hydrostatic pressure implemented into MPM framework. deal...
We report herein the experimental investigation of through-hole energy-density threshold silicon irradiated by a double-pulse laser. The double pulse consists 1 ms and time-delayed 5 ns is referred to as combined-pulse laser (CPL). A modified level-set method used calculate process millisecond drilling, we study how time delay affects CPL. results show that decreases with increasing between CPL pulses. In addition, energy density nanosecond strongly threshold. also consider thickness doping...
Magneto-plasmonic Ag/Ni and Ag/Fe nanoparticles (NPs) were synthesized in this work using the environmentally safe contaminant-free dual-pulsed Q-switched Nd:YAG 1064 nm laser ablation method. The optical magnetic characteristics of nanomaterials investigated a vibrating sample magnetometer an ultraviolet-visible absorption spectrometer. According to transmission electron microscopy (TEM), shape NPs seems be spherical, with mean diameters 7.3 11.5 nm, respectively. X-ray diffraction (XRD)...
A model containing an inclusion matrix heated by a millisecond laser is proposed to calculate temperature and thermal stress fields of K9-glass using finite element method. First, the evolution analyzed. Results show that both upper lower surfaces are damaged. primarily damaged combination radial axial stresses. Calculated damage morphology mainly determined stress. Then with increase incident energy investigated, which shows area spreads inward from front rear surfaces. Finally,...
Optical beam deflection and high-speed photographic methods are employed to investigate the interaction mechanism between a laser-induced bubble metal target for underwater laser propulsion. A preliminary theory is proposed reveal step increases of kinetic energy transferred during process increasing incident energy. This also helps explain coupling efficiency with
COMSOL Multiphysics was employed to establish a dislocation model based on the Alexander and Haasen (AH) model, heat conduction equation, Hooke's law for calculating distribution of germanium (Ge) under laser irradiation. The numerical simulation results were obtained. A continuous 1080 nm utilized ablate monocrystalline Ge wafers validate model. experimental show that no surface damage appears until irradiances go up 234W/cm2 100 ms ablation. This is consistent with findings. initiation...
The wide variety of uses for nanoparticles (NPs) is due to their unique combination features in a single assembly. arc melted copper-cobalt ingot sample were qualitatively studied using laser induced breakdown spectroscopy (LIBS). Later, the fabricated alloy as target material Nd:YAG ablation, CuCo2O4 NPs synthesized. magnetic properties synthesized vibrating magnetometer (VSM). To determine composition and morphology NPs, X-ray diffraction (XRD), energy dispersive (EDX) analysis,...
To investigate the dynamics of a bubble induced on finite rigid boundary in water, simple experimental method based laser beam transmission probe is developed to measure time dependence bubble’s radius metallic surface under different incident energies, and numerical employed simulate first collapse. A correction factor Raleigh collapse formula proposed describe boundary. The simulation results show that slightly for subsequent two oscillations, its detailed expression obtained from results....
The Askaryan Radio Array (ARA) experiment at the South Pole is designed to detect radio signals produced by ultra high energy cosmic neutrino interactions in ice. There are 5 independent ARA stations, one of which (A5) includes a low-threshold phased array trigger string. Each station work as an autonomous detector. Data Acquisition System all stations equipped with Ice Ray Sampler second-generation (IRS2) chip, custom-made, application-specific integrated circuit (ASIC) for high-speed...
Time-resolved surface temperature of single crystal silicon was measured by an infrared radiation pyrometer. The sample irradiated two pulsed Nd:YAG lasers with pulse duration 1ms superposed 7ns pulses, referred to as combined laser (CPL). change the damage radius millisecond (ms) energy density studied, and then compared that ms irradiation. An axisymmetric numerical model established for calculation field distribution while CPL, respectively. Compared experimental results, CPL-silicon...
Nanocomposites have many promising applications such as in hyperthermia and photodegradation. Laser ablation-assisted synthesis of nanocomposites offers several advantages it is a green method, cost-effective, ease handling absence any by-products. This study included the fabrication copper-silicon (Cu-Si) using liquid-phase laser ablation, followed by an investigation into their potential uses photothermal The surface properties, chemical composition crystallinity were examined X-ray...