Mitigation of BSG damage caused by upstream flaw in the final optics assembly

Zhaoyang Jiao; Mingying Sun; Dongfeng Zhao; Jianqiang Zhu

doi:10.1117/12.2235623

22 July 2016 Mitigation of BSG damage caused by upstream flaw in the final optics assembly

Zhaoyang Jiao, Mingying Sun, Dongfeng Zhao, Jianqiang Zhu

Proceedings Volume 9983, Pacific Rim Laser Damage 2016: Optical Materials for High-Power Lasers; 99831D (2016) https://doi.org/10.1117/12.2235623
Event: Pacific Rim Laser Damage 2016: Optical Materials for High Power Lasers, 2016, Yokohama, Japan

Abstract

In high-power laser facilities for the inertial confinement fusion, there are many large-radius optical elements, which inevitably have some flaws on the surface. The flaws can cause optical intensity intensification and therefore damage the optical elements in the downstream, especially for the beam sampling grating (BSG), which is an important element in the final optics assembly. In this paper, several physical models are established to study the optical field enhancement in the BSG position modulated by upstream flaw. Firstly, when only the linear transportation is considered, it is found that there is a peak or valley of the maximum intensity after the focus lens compared with the ideal wave front. Meanwhile the influence of flaw has an effective range. Secondly, when the nonlinear effect of the focus lens is also considered, the peak maximum downstream is much bigger than the one for the linear consideration and the damage risk of the BSG there is much higher too. From the simulation, we can see that it is important to place the BSG in a properly selected position to mitigate the laser induced damage. The results could give some references to the mitigation of BSG damage caused by upstream flaws and the layout of the final optics assembly.

Citation Download Citation

Zhaoyang Jiao, Mingying Sun, Dongfeng Zhao, and Jianqiang Zhu "Mitigation of BSG damage caused by upstream flaw in the final optics assembly", Proc. SPIE 9983, Pacific Rim Laser Damage 2016: Optical Materials for High-Power Lasers, 99831D (22 July 2016); https://doi.org/10.1117/12.2235623

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KEYWORDS

Modulation

Near field optics

Optical components

High power lasers

Frequency converters

Nonlinear optics

Laser induced damage

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