基于有限元分析的大型固体激光器稳定性指标重分配

Stability reallocation of large solid state laser based on finite element analysis

在大型固体激光器结构稳定性设计中,使用等概率分配方法的分配值作为光学元件稳定性设计指标常常会增加结构设计的难度,造成结构建造的巨大浪费。为此,提出了基于结构有限元分析的稳定性指标重分配方法,即将同一光路中光学元件振动响应引起靶点光束的定位误差作为各自的权重系数,采用线性加权和法对稳定性指标进行重新分配。稳定性指标重分配后,所得到的同一光路中各光学元件的安全系数相等。利用此方法对某大型固体激光装置主机装置靶区一条光路中光学元件的稳定性指标进行了重分配,得到每条光路上光学元件稳定性的安全系数均为1.229,满足结构稳定性设计要求。

In the stability design of a high-power laser facility,if equiprobable allocation results are chosen as the stability design indexes,there are often much difficulty in structure design and great waste in building.Thus,a stability reallocation way based on the finite element analysis（FEA） is put forward.That is,computing the linear weighted coefficients with the target orientation errors brought by the vibration responses of optical elements in a beam,and then reallocating the stability indexes by the linear weighted method.The safety factors are equal in the beam after the reallocation.Stability indexes in a beam of centain large laser facility＇s target area are reallocated by this method,and all beams＇ safety factors are 1.229,satisfying the requirement of stability design.