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利用激光诱导等离子体开关技术,对355 nm脉冲激光自削波进行了实验和理论研究。分别采用5种不同焦距的透镜,集中讨论了透镜焦距及激光器输出单脉冲能量对脉宽压缩的影响,发现采用焦距为200 mm的透镜能够获得最佳的脉冲压缩效果。在聚焦透镜焦距200 mm,单脉冲能量160 mJ时,获得最短脉宽3.47 ns;在激光电离Cu小孔内壁表面及空气击穿共同作用下,获得了脉宽最短达2.11 ns的脉冲激光输出。此外,根据实验结果得到了355 nm激光空气击穿阈值,并与理论估算值进行比较,两者结果较为一致。
The laser-induced plasma switch technique was used to experimentally and theoretically investigate the 355 nm pulsed laser self-clipping. Five kinds of lenses with different focal lengths were respectively used to focus on the effects of the lens focal length and the laser output single pulse energy on the pulse width compression. The best pulse compression effect was obtained by using a lens with a focal length of 200 mm. The shortest pulse width of 3.47 ns was obtained when the focal length of the lens was 200 mm and the pulse energy was 160 mJ. The pulse laser output with the shortest pulse width of 2.11 ns was obtained under the combined effect of the inner wall surface of laser Cu hole and air breakdown. In addition, the 355 nm laser air breakdown threshold is obtained according to the experimental results, and compared with the theoretical estimation, the results are consistent.