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Towards a better understanding of multi-wavelength effects on KDP crystals

机译:更好地了解KDP晶体上的多波长效应

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Laser damage in KDP crystals has been studied since several years and more accurately with emergence of projects like LMJ (Laser MegaJoule, in France) or NIF (National Ignition Facility, in US). Laser damage tests are essentially performed at 351-nm wavelength (3ω), with regards to their optical behaviours on forementioned facilities. But only few data are available at 1064 nm (1ω) and at 532 nm (2ω), and even with wavelength-mixing more representative of operational conditions of KDP crystals. So in a first approach, we tried to carry out an identity chart of the crystal by performing mono-wavelength tests at 1ω, 2ω and 3ω. Then, a campaign of combination of multi-wavelength (typically 3ω and 1ω) tests has been started with several temporal delays between 3ω and lco pulses. These first results lead us to improve pre-existing modelling codes developed by CEA, which have proved their robustness to 3ω-experiment results. Foremost interests consist in implementing wavelength dependency and energy deposition mechanism as a consequence of our first observations on KDP.
机译:多年来,随着LMJ(法国的Laser MegaJoule)或NIF(美国的国家点火设施)项目的出现,对KDP晶体中的激光损伤进行了研究,并且更加准确。关于它们在上述设施上的光学性能,基本上在351 nm波长(3ω)上进行激光损伤测试。但是在1064 nm(1ω)和532 nm(2ω)甚至波长混合下,只有很少的数据可用,更能代表KDP晶体的工作条件。因此,在第一种方法中,我们试图通过在1ω,2ω和3ω处进行单波长测试来制作晶体的身份图。然后,已经开始了多波长(通常为3ω和1ω)测试的组合运动,其中在3ω和lco脉冲之间存在一些时间延迟。这些最初的结果使我们改进了CEA开发的现有建模代码,这些代码已证明其对3ω实验结果的鲁棒性。由于我们对KDP的首次观察,最重要的兴趣在于实现波长依赖性和能量沉积机制。

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