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Effect of Electric Field Regulation on Laser Damage of Composite Low-Dispersion Mirrors

机译：电场调节对复合低辐射镜激光损伤的影响

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摘要

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.
机译：由于它们在PetAwatt（PW）激光系统中的潜在使用，低分散镜很重要。已知以下两种方法增加了低分散光学部件的激光诱导的损伤阈值：使用宽带隙材料保护层和电场分布的控制。通过控制复合低色分散镜（CLDM）的电场分布，我们将电场峰从材料界面移入宽带隙材料。然而，改性电场复合低分散镜（E-CLDM）的损伤阈值不会增加。损伤形态表明初始损坏层是TA2O5。立即原因是由表面电场调节引起的内层中的电场的增强。理论计算表明，CLDM或E-CLDM的损伤阈值由带隙和层材料的电场的竞争结果确定。具有不同材料或不同的保护层周期的CLDM可以根据未来的电场竞争效应来最佳地设计。

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