Liu Zhichao, Geng Feng, Lei Xiangyang, Li Yaguo, Cheng Jian, Zheng Yi, Wang Jian, Xu Qiao
Appl Opt. 2020 Jun 10;59(17):5240-5246. doi: 10.1364/AO.393097.
The impact of laser conditioning (LC) fluence and pulse duration on nanosecond (ns) laser damage performance of deuterated potassium dihydrogen phosphate (DKDP) crystal is studied. The result shows that higher LC fluence leads to a better damage resistance. In general, the sub-nanosecond LC effect is better than the nanosecond LC. However, in the range of 0.3 ns to 0.8 ns, the pulse duration has no obvious impact on the LC effect. An ultra-fast process characterization technology is employed to demonstrate that the cleaning effect of the protuberance defects on the surface is one of sub-ns LC mechanism. Eventually, a couple of optimized LC parameters that doubled the maximum damage threshold of DKDP crystal is proposed.
研究了激光预处理（LC）能量密度和脉冲持续时间对氘代磷酸二氢钾（DKDP）晶体纳秒（ns）激光损伤性能的影响。结果表明，较高的LC能量密度导致更好的抗损伤能力。一般来说，亚纳秒LC效应优于纳秒LC。然而，在0.3 ns至0.8 ns范围内，脉冲持续时间对LC效应没有明显影响。采用超快速过程表征技术证明，表面突起缺陷的清洁效应是亚纳秒LC机制之一。最终，提出了几个优化的LC参数，使DKDP晶体的最大损伤阈值提高了一倍。
