利用1 064 nm激光预处理提高pickoff镜损伤阈值

Damage-threshold increase of pickoff optics using 1 064 nm wavelength laser

摘要: 激光预处理是提高光学元件损伤阈值的有效方法之一。利用输出1 064 nm基频激光的SAGA激光器，采用光栅刻线式扫描的方式对镀多层高反物理膜的pickoff镜进行了能量周期递增的预处理，验证激光预处理对其损伤阈值的提高效果。结果表明：零几率损伤阈值平均提高38.8%，而50%几率损伤阈值提高了7.6%，经过激光预处理后pickoff镜抗损伤能力较处理前有了一定提高。

Abstract: Laser pre-treatment is an efficient means to increase damagethresholds of optics. In order to validate the effect of laser pre-treatment on pickoff optics and study its value in engineering application, 1 064 nm YLF laser was used to raster scan pickoff optics with high reflection physics multilayer coating by means of power increase by degrees periodicity. The result was that zero probability damage-thresholds increased 38.8% and 50% probability damage-thresholds increased 7.6%, damage resistance of pickoff optics was evidently enhanced through pre-treatment.