以光学系统中的白宝石分光镜为研究对象,利用有限元方法和Zernike多项式对其热变形像差进行了计算和拟合,分别对入射激光的反射相移和信标光的透射相移进行了研究和分析。入射激光的反射相移的主要像差为离焦项;信标光的透射相移的主要像差包含离焦项和主球差项,而主球差的引入主要是由于在激光入射区域边界上轴向温度分布的不均匀性。利用像差比率γnm直观反映入射激光的吸收功率与反射激光和透射信标光的像差的关系,对入射激光而言,其离焦比率γ20=0.0393;对信标光而言,其离焦比率γ20=-0.0011,主球差比率γ40=-0.0033。 In the optical system, the white laser beam splitter was taken as the research object. The thermal deformation aberrations were calculated and fitted by the finite element method and the Zernike polynomial. The phase shift of the incident laser beam and the transmission phase shift of the beacon beam Research and analysis. The main aberration of the reflected phase shift of the incident laser is the defocus term. The main aberration of the transmission phase shift of the beacon light contains the defocus term and the main spherical difference term. The introduction of the main spherical aberration is mainly due to the fact that, Unevenness of the upper axial temperature distribution. The aberration ratio γnm is used to directly reflect the relationship between the absorbed power of the incident laser light and the aberration of the reflected laser light and the transmitted beacon light. For the incident laser light, the defocus ratio γ20 = 0.0393; for the beacon light, the defocus The ratio γ20 = -0.0011, the main spherical aberration ratio γ40 = -0.0033.