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首页> 外文期刊>Optics Letters >Effect of multiple wavelengths on laser-induced damage in KH_((2-x))D_(x)PO_(4) crystals
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Effect of multiple wavelengths on laser-induced damage in KH_((2-x))D_(x)PO_(4) crystals

机译：多波长对KH _（（2-x））D_（x）PO_（4）晶体中激光诱导的损伤的影响

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摘要

Laser-induced damage is a key factor that constrains the ways in which optical materials are used in high-power laser systems. We study the size and density of bulk laser-induced damage sites formed during frequency tripling in a DKDP crystal. The characteristics of the damage sites formed during tripling, for which 1053, 526, and 351 nm light is simultaneously present, are compared to those of damage sites formed by 351 nm light alone. The fluence of each wavelength is calculated as a function of depth with a full 4D(x,y,z,t) frequency conversion code and compared with measured damage density and size distributions. The density of damage is found to be governed predominantly by 351 nm light with some lesser, though nonnegligible, contribution from 526 nm light. The 1053 nm light does not appear to contribute to the damage density. The morphology of the damage sites, however, is seen to be relatively insensitive to wavelength and to depend only on total fluence of all wavelengths present. The strong and negligible wavelength dependences of initiation density and damage morphology, respectively, indicate that the dominant energy deposition mechanism varies during the damaging pulse.
机译：激光引起的损坏是限制在高功率激光系统中使用光学材料的方式的关键因素。我们研究了在DKDP晶体的频率三倍期间形成的大体积激光诱导的损伤部位的大小和密度。将三倍期间同时存在1053、526和351 nm光的三处形成的损伤部位的特性与仅由351 nm光形成的损伤部位的特性进行比较。使用完整的4D（x，y，z，t）频率转换代码计算每个波长的能量密度与深度的关系，并将其与测得的损伤密度和尺寸分布进行比较。发现损坏的密度主要由351 nm的光控制，而526 nm的光的贡献较小，尽管不可忽略。 1053 nm的光似乎对损伤密度没有贡献。但是，可以看到损伤部位的形态对波长相对不敏感，并且仅取决于存在的所有波长的总能量密度。初始密度和损伤形态分别与波长的强相关性和可忽略不计，表明主要的能量沉积机理在破坏性脉冲期间发生变化。

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