关键词: 大口径反射镜, 装配, 面形精度, 蒙特卡罗仿真

Abstract:

In China's high power solid laser facility, precision mounting of 400mm class large reflecting mirror is very important for the final targeting accuracy of laser beams. Considering that the reflecting mirror was mounted with screws array, the mathematical relationship among nominal fastening forces and the reflector surface deformation was studied with FEM method and wavefront polynomial methodologies. Furthermore, taking some real world factors such as, manfuactring errors, material properties and manual operations-into account, there was a random distribution within a wide range for real fastening forces even under same tightening torque. So a Monte-Carlo simulation method was proposed to predicate the impact of the uncertain fastening forces on the reflector's surface deformation. Additionally, the force limitation was also obtained to control the surface deformation, which can be used to guide practical reflector precsion assembly.

Key words: large reflecting mirror, assembly, surface accuracy, Monte-Carlo simulation