为提高激光扩束系统的温度适应性水平，提出了一种直接面向光学系统波像差的光机结构优化方法。对扩束系统进行了敏感度分析，并结合齐次坐标变换，将波像差的失调模型与有限元中的节点应变进行有机结合。以最小化失调波像差为优化目标，得到了支撑结构的最优材料拓扑，然后按照拓扑云图对镜架进行分块划分和尺寸优化。最终得到的镜架结构合理，加工工艺性良好，且具有优良的温度适应性。-50 ℃时，扩束系统波像差均方根(RMS)值从0.728 λ降为0.196 λ，λ=632.8 nm；而且在±50 ℃的范围内，同等载荷条件下，优化后的系统波像差RMS值约为优化前的1/4。

In order to improve the temperature adaptability of vehicle-borne beam expander system, a structural optimization method is proposed to directly deal with optical wavefront aberrations. After sensitivity analysis, root mean square (RMS) value of the optical wavefront aberration can be calculated from the strain of the finite element nodes through homogeneous coordinate transformation. Taking the minimum wavefront aberration as the optimization objective, an optimized topology is obtained. According to the topology of material, the frame is divided into blocks, and optimized secondly in the form of size optimization. Finally, a manufacturable structure with good temperature flexibility is obtained. When the thermal load is -50 ℃, the wavefront aberration RMS value is reduced from 0.728 λ to 0.196 λ, λ= 632.8 nm. And in the range of ±50 ℃, the optimized wavefront aberration RMS value is about 1/4 times as large as that before optimization at the same thermal load conditions.