摘要
针对惯性约束聚激光装置终端光学系统中使用的大口径超薄晶体的面形畸变,探索了一种低应力新型夹持方法——四周回形全紧固夹持法。从谐波转换模型和晶体准直两方面进行了分析,表明晶体面形畸变将降低三倍频效率和导致准直光斑弥散,并提出了晶体面形总畸变小于5μm和晶体装夹畸变小于加工畸变的两项控制目标。再根据力学模型,设计了四周回形全紧固夹持法的精密装配结构,并对该结构进行了精密加工控制和有限元分析,以及实验验证。验证结果表明,利用低应力新型夹持方法,晶体装配后的总面形畸变小于5μm,说明该方法能够满足晶体的面形畸变控制目标。
Aiming at the surface aberration for large-aperture and ultra-thin crystal used on the final optical system of inertial confinement fusion facility, a new design of precision mounts with low-stress, named clip-like clamped support all four edges, is proposed. Based on the harmonic conversion model and crystal alignment, the third harmonic generation efficiency will fall and the alignment focal spot will widen because of the crystal surface aberration. So the two control aims must be achieved that the surface aberration should be less than 5 μm and the crystal clamping aberration should be less than machining aberration. Based on the mechanics model, the clip-like clamped support all four edges of precise assembly structure is designed. The precision machining control, finite element analysis, and experimental verification are carried out. Experimental results show that the total surface aberration is less than 5 μm by using the method of precision mounts with low-stress, this method meets the demand of crystal surface aberration control.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2017年第2期293-300,共8页
Chinese Journal of Lasers
基金
国家自然科学基金(11304293)
关键词
非线性光学
非线性波混频
惯性约束聚变
大口径超薄晶体
面形畸变
光机装配
nonlinear optics
nonlinear wave mixing
inertial confinement fusion
large-aperture and ultra-thin crystal
surface aberration
opto-mechanical mounts
