We perform an experimental study of two-dimensional（2D） electron density profiles of the laser-induced plasma plumes in air by ordinarily laboratorial interferometry. The electron density distributions measured show...We perform an experimental study of two-dimensional（2D） electron density profiles of the laser-induced plasma plumes in air by ordinarily laboratorial interferometry. The electron density distributions measured show a feature of hollow core. To illustrate the feature, we present a theoretical investigation by using dynamics analysis. In the simulation, the propagation of laser pulse with the evolution of electron density is utilized to evaluate ionization of air target for the plasma-formation stage. In the plasma-expansion stage, a simple adiabatic fluid dynamics is used to calculate the evolution of plasma outward expansion. The simulations show good agreements with experimental results, and demonstrate an effective way of determining 2D density profiles of the laser-induced plasma plume in gas.展开更多
A high-speed dynamic-range-extended white light interferometry(HS-DRE-WLI) system is developed for fast,high-resolution 3D surface profiling across varying reflectance levels. The system combines high-speed fiber-stre...A high-speed dynamic-range-extended white light interferometry(HS-DRE-WLI) system is developed for fast,high-resolution 3D surface profiling across varying reflectance levels. The system combines high-speed fiber-stretcher-based optical path difference modulation with an asymmetric line-illumination technique to enhance imaging speed and dynamic range. Chromatic and polarization-induced distortions are minimized through dispersion compensation using optimized fiber lengths and a Faraday rotator, achieving 14.2-μm axial resolution. Validated on diverse samples, the system captures fine and large-scale features with high fidelity,demonstrating strong potential for industrial and biomedical applications requiring accurate, robust surface measurements.展开更多
基金supported by National Natural Science Foundation of China(Nos.11264036,11465016 and 11364038)
文摘We perform an experimental study of two-dimensional（2D） electron density profiles of the laser-induced plasma plumes in air by ordinarily laboratorial interferometry. The electron density distributions measured show a feature of hollow core. To illustrate the feature, we present a theoretical investigation by using dynamics analysis. In the simulation, the propagation of laser pulse with the evolution of electron density is utilized to evaluate ionization of air target for the plasma-formation stage. In the plasma-expansion stage, a simple adiabatic fluid dynamics is used to calculate the evolution of plasma outward expansion. The simulations show good agreements with experimental results, and demonstrate an effective way of determining 2D density profiles of the laser-induced plasma plume in gas.
基金National Research Foundation of Korea(NRFRS-2021-NR060086)Korea Evaluation Institute of Industrial Technology(1415181752)Institute of Civil-Military Technology Cooperation(23-SF-EL-09).
文摘A high-speed dynamic-range-extended white light interferometry(HS-DRE-WLI) system is developed for fast,high-resolution 3D surface profiling across varying reflectance levels. The system combines high-speed fiber-stretcher-based optical path difference modulation with an asymmetric line-illumination technique to enhance imaging speed and dynamic range. Chromatic and polarization-induced distortions are minimized through dispersion compensation using optimized fiber lengths and a Faraday rotator, achieving 14.2-μm axial resolution. Validated on diverse samples, the system captures fine and large-scale features with high fidelity,demonstrating strong potential for industrial and biomedical applications requiring accurate, robust surface measurements.
