We present a laser induced damage threshold (LIDT) measurement technique where a mm-diameter non-Gaussian laser beam is used. This allows both a large number of measurements points and a large range of fluence to be sampled with a single measure. The method is used in-situ, inside the laser radiation – matter interaction vacuum vessel used for high power experiments with a 100 TW-class laser system. With our 2.5-Hz repetition rate laser system, the well-known incubation effect is observed where the laser damage threshold on the optics decreases with increasing number of laser shots. The incubation effect is studied with 22-fs laser pulses at a laser 2.5-Hz nominal repetition rate with several optics like dielectric mirrors and gold compression gratings irradiated by up to 9 10³ laser shots.

我们提出了一种激光诱导损伤阈值 (LIDT) 测量技术，其中使用了毫米直径的非高斯激光束。这允许使用单个测量对大量测量点和大范围的注量进行采样。该方法在用于高功率实验的激光辐射-物质相互作用真空容器内原位使用，使用 100 TW 级激光系统。使用我们的 2.5 Hz 重复率激光系统，观察到众所周知的孵化效应，其中光学器件上的激光损伤阈值随着激光发射次数的增加而降低。使用 22-fs 激光脉冲在 2.5-Hz 激光标称重复率下研究孵化效应，并使用多种光学元件（如介电镜和金压缩光栅）照射高达 9 10 ³ 激光射击。