Bio-inspired surface aberration mitigation technique for high-frequency conversion efficiency of large-aperture nonlinear optics.
Bio-inspired surface aberration mitigation technique for high-frequency conversion efficiency of large-aperture nonlinear optics.
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DOI：
10.1364/oe.27.027962
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发表时间：
2019-09
期刊：
影响因子：
3.8
通讯作者：
Zeyu Zhang;L. Ye;Dongya Chu;Guoqing Pei;Weifeng Du;Tianye Liu;Hui Wang;Xu Xu-Xu
中科院分区：
文献类型：
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作者：
Zeyu Zhang;L. Ye;Dongya Chu;Guoqing Pei;Weifeng Du;Tianye Liu;Hui Wang;Xu Xu-Xu
低频转换效率严重限制了惯性约束聚变装置靶上3ω紫外能量密度的提高。本文提出了一种仿生表面像差抑制（SAM）技术，该技术可以显著降低晶体表面像差，并在400 mm × 400 mm的通光孔径范围内实现高频率转换效率。此外，各种操作条件对表面像差，角度失谐量，和频率转换效率的影响进行了说明。最后通过建立的离线表征系统和原位成像系统验证了该方法的工艺稳定性和在线可行性。
Low-frequency conversion efficiency severely limits the 3ω ultraviolet energy density at the target of inertial confinement fusion facilities. Here, we present a bio-inspired surface aberration mitigation (SAM) technique that could significantly reduce the crystal surface aberration and realize high frequency conversion efficiency over a clear aperture of 400 mm × 400 mm. Numerical models are utilized to optimize and verify the mechanical properties and physical performance of the SAM technique. In addition, the influences of various operation conditions on surface aberration, angle-detuning magnitude, and frequency conversion efficiency are illustrated. Finally, the process stability and online feasibility of this new approach are validated by the established offline characterization system and in situ imaging system.