面向波前精度及相位匹配性能优化的激光频率转换单元装配工艺机理研究

以我国惯性约束聚变（ICF）重大科学装置终端光学系统中频率转换单元的精密装配工艺与光学性能控制难题为背景，重在深入探究各向异性晶体薄板单元的结构\工艺参数对于激光非线性倍频过程及波前质量的内在影响规律，提出频率转换单元的装配结构、材料、工艺及载荷参数及环境激励对于晶体元件的相位匹配性及波前误差等关键光学性能指标的作用机理；在阐明晶体元件激光倍频性能问题所涉及装配工艺学原理的基础上，围绕着倍频晶体光学性能提升的目标提出面向400mm大口径频率转换单元的柔性装配工艺原理，为我国新一代兆焦耳级激光驱动器工程的频率转换单元装配工艺研究提供科学指导。

The optical performance of laser beam frequency converter is a crucial challengeable problem in the technical development of China’s inertial confinement fusion (ICF) facility. In this research, we will be focusing on the fundamental impact of the frequency convertor’s structural and assembly process parameters on its optical wavefront and harmonic generation. Furthermore, through a deep study of modeling the dynamic impact of mechanical structure, assembly preloads and ambient excitations on the nonlinear performance of frequency convertor, we will put forward a methodology of 400mm aperture KDP frequency converter assembly optimization, with the aim to realize a better second harmonic generation (SHG) of KDP crystal. This research is also expected to provide the scientific guidance and technical support for the assembly technological progress of the frequency converters in China’s new generation MJ-class ICF facility.