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利用光学元件激光损伤测试平台,测试了355nm皮秒激光辐照下熔石英光学元件的初始损伤及损伤增长情况,并通过荧光检测分析了损伤区缺陷。研究结果表明:皮秒激光较高的峰值功率导致熔石英损伤阈值较低,前表面损伤阈值为3.98J/cm2,后表面损伤阈值为2.91J/cm2;前后表面损伤形貌存在较大差异,后表面比前表面损伤程度轻且伴随体内丝状损伤;随脉冲数的增加后表面损伤直径增长缓慢,损伤深度呈线性增长;皮秒激光的动态自聚焦和自散焦导致熔石英体内损伤存在细丝和炸裂点重复的现象;与纳秒激光损伤相比,损伤区缺陷发生明显改变。
The initial damage and damage growth of fused silica optical element under 355nm picosecond laser irradiation were tested by using optical element laser damage test platform. The defect of damaged area was analyzed by fluorescence detection. The results show that the higher peak power of picosecond laser results in lower damage threshold of fused silica, the threshold value of front surface damage is 3.98J / cm2 and the threshold of back surface damage is 2.91J / cm2. The damage of the posterior surface was less than that of the anterior surface and accompanied with the filamentous injury in the body. With the increase of pulse number, the diameter of the surface damage increased slowly and the depth of damage increased linearly. The self-focusing and self- Filaments and burst point repeated phenomenon; compared with the nanosecond laser damage, the damage zone defects significantly changed.