Low dispersion mirrors are important because of their potential use in petawatt (PW) laser systems. The following two methods are known to increase the laser-induced damage threshold of low dispersion optical components: use of a wide-bandgap-material protective layer and control of electric field distribution. By controlling the electric field distribution of composite low-dispersion mirrors (CLDM), we shift the electric field peaks from the material interface into the wide-bandgap material. However, the damage threshold of modified-electric-field composite low dispersion mirror (E-CLDM) does not increase. Damage morphology shows that the initial damaged layer is Ta₂O₅. An immediate cause is the enhancement of the electric field in internal layers caused by surface electric field regulation. Theoretical calculations show that the damage threshold of CLDM or E-CLDM is determined by the competition results of bandgap and the electric field of layer materials. The CLDM with different materials or different protective layer periods can be optimally designed according to the electric field competition effect in the future.

中文翻译：

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电场调节对复合低色散镜激光损伤的影响

低色散镜之所以重要，是因为其潜在的潜力可用于皮瓦（PW）激光系统。已知以下两种方法可提高低色散光学组件的激光诱导损伤阈值：使用宽带隙材料保护层和控制电场分布。通过控制复合低色散镜（CLDM）的电场分布，我们将电场峰从材料界面转移到宽带隙材料中。但是，改进电场复合低色散镜（E-CLDM）的损坏阈值不会增加。损伤形态表明，初始损伤层为Ta ₂ O _5。。一个直接的原因是由于表面电场调节而导致内部层中电场的增强。理论计算表明，CLDM或E-CLDM的损伤阈值由带隙的竞争结果和层材料的电场决定。将来可以根据电场竞争效应，对具有不同材料或不同保护层周期的CLDM进行优化设计。