Stability analysis of reflector module in the laser facility based on sub-structure method

Reflector module is an important part of the laser facility, the rotation stability of which has a direct effect on the beams propagation. In order to obtain the rotations of reflectors due to ambient vibration, the finite element analysis is adopted. Finite model of a laser facility with mirror mount is built by the finite element analysis software based on full-structure and sub-structure methods. Then, the random vibration analysis is carried out, and the rotation angles of two reflectors are calculated. The result differences between these two methods are 3.99%,11.84%, which indicates that the analysis is reasonable based on sub-structure method when calculating the stability of large laser facility with mirror mount.