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KDP晶体是目前高功率激光装置中倍频材料的首选,元件上架前通常采用激光预处理来提高抗激光损伤性能,由于预处理流程耗时较多,提升预处理效率对于工程应用具有重要意义。研究了激光预处理参数对KDP晶体材料损伤性能的影响,通过分析激光辐照通量、辐照发次、能量台阶等预处理参数与元件损伤性能的变化关系,发现在一定通量范围内用不同的能量台阶可以获得同样的预处理效果,由此确定采用变能量台阶的方法对预处理参数进行优化。实验证明,采用此方法可以在保证预处理效果的前提下,将总的激光辐照发次缩减三分之一,结果对于大口径KDP晶体元件的激光预处理工艺具有重要参考价值。
KDP crystal is the preferred frequency doubling material in high-power laser devices. Laser pretreatment is usually used to improve the anti-laser damage performance. Since the pretreatment process takes more time, improving the pretreatment efficiency is of great significance for engineering applications. The effect of laser pretreatment parameters on the damage properties of KDP crystal materials was studied. The relationship between pretreatment parameters, such as laser irradiation flux, irradiation time and energy step, Different energy steps can get the same preconditioning effect, which determines the use of variable energy steps to optimize the pretreatment parameters. Experiments show that using this method can reduce the total laser irradiation by one third with the premise of ensuring the pretreatment effect, and the results are of important reference value for laser pretreatment of large-diameter KDP crystal components.