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19 November 2019 Research on the cross polarization wave generation based on gadolinium gallium garnet crystal
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Abstract
To obtain seed pulses of large energy, high contrast and broad spectral bandwidth for the high power laser system, a new cross-polarized wave (XPW) generator based on the gadolinium gallium garnet (GGG) crystal is designed. For the injected fundamental wave (FW) pulses exceeding tens of millijoule, the output XPW characteristics of conversion efficiency, spectral broadening and contrast improvement are theoretically analyzed. We also investigated the influence of spatial distribution characteristics of the injected chirped FW pulses on the output XPW. With incident FW pulses of 8 order super gaussian spatial profile for instance, conversion efficiency of ~73%, spectral broadening ratio (SBR) of ~2.7 (from 40nm to 108nm) and contrast boost by >7 orders of magnitude can be obtained. The impact of the FW spatial modulation on XPW was sensitive to the modulation depth, which is significant for spatial quality control of the laser beam in high power laser systems.
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Shunhua Yang, Xinglong Xie, Ziruo Cui, Xiao Liang, Qingwei Yang, Ping Zhu, Meizhi Sun, and Jianqiang Zhu "Research on the cross polarization wave generation based on gadolinium gallium garnet crystal", Proc. SPIE 11181, High-Power Lasers and Applications X, 1118106 (19 November 2019); https://doi.org/10.1117/12.2536664
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