调Q激光引诱固体表面击穿高速摄影研究

High-speed photograph of Q-switching laser induced breakdown on solid surface

用光路延迟装置在同一台YAG激光器上研究了激光引诱固体表面击穿的瞬态物理过程,首次获得了该过程最初阶段(200ns以内)的冲击波和等离子体的时间序列分辨的阴影图和Mach-Zehnder干涉图。并计算了等离子体的折射率分布和冲击波前的电子密度。

By using optical path delaying set-up, the instantaneous process that a Q-switching YAG laser induces breakdown on solid surface is studied. Time-resolved shadowgrams and Mach-Zehnder interferograms of the initiation(within 200ns) of the shock-wave and plasma which is produced in this process are obtained firstly.plasma refractivity and electron density on the 'shock-wave front are computed.