纳秒脉冲激光诱导水等离子体屏蔽的实验研究

Experimental Studies on NS Pulse Laser Induced Liquid plasma Shadowgraphy

基于激光阴影法测量原理,建立了一个记录纳秒脉冲激光诱导等离子体屏蔽现象的实验光路系统,探索了一种等离子体屏蔽图像的记录方法,对纳秒脉冲激光诱导水击穿形成等离子体的现象进行了研究.记录了在不同能量状态下出现的激光诱导等离子体屏蔽图像,发现了激光诱导水介质的等离子体屏蔽效应随作用光能量呈增强的趋势,首次观测到了在纳秒脉冲激光作用下液体中出现的线型击穿现象.本文研究结果可为水下激光加工研究、医疗以及激光在液体中的传播特性研究提供实验依据.

Based on the measurement principle of laser hatched method,an equipment for measure plasma shield was set up.The shielding of NS pulse laser induced breakdown in water was studied.Laser induced plasma shield images were recorded.Linear relation between the effect and laser energy was found.Linear break phenomenon by the NS pulse laser was observed for the first time.These research results will provide the theoretical and experimental references for laser processing underwater,laser medicine and corresponding hydromechanics.