Special Section on Laser Damage III

Mitigation of beam sampling grating damage induced by upstream flaws in the final optics assembly

[+] Author Affiliations
Zhaoyang Jiao, Mingying Sun, Dongfeng Zhao, Jianqiang Zhu

Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics, National Laboratory on High Power Laser and Physics, No. 390, Qinghe Road, Jiading District, Shanghai 201800, China

Opt. Eng. 56(1), 011021 (Oct 13, 2016). doi:10.1117/1.OE.56.1.011021
History: Received June 29, 2016; Accepted September 23, 2016
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Abstract.  The high fluence performance of high-power laser systems is set by optical damage, especially in the final optics assembly (FOA). The flaws on the frequency converter surface can cause optical intensity intensification and, therefore, damage the downstream optical elements, such as the beam sampling grating (BSG), which is an important component in the FOA. Mitigation of BSG damage caused by flaws is discussed. Physical models are established to simulate the optical field enhancement on BSG modulated by the upstream flaw, considering both the linear and nonlinear propagation effects. Numerical calculations suggest that it is important to place the BSG in a properly selected position to mitigate the laser-induced damage. Furthermore, strict controls of flaw size, modulation depth, distance between frequency converter and focusing lens, and the thickness of the focusing lens are also significant to mitigate the BSG damage. The results obtained could also give some suggestions for damage mitigation of optical components and the layout design of the final optics assembly.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Zhaoyang Jiao ; Mingying Sun ; Dongfeng Zhao and Jianqiang Zhu
"Mitigation of beam sampling grating damage induced by upstream flaws in the final optics assembly", Opt. Eng. 56(1), 011021 (Oct 13, 2016). ; http://dx.doi.org/10.1117/1.OE.56.1.011021


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