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为了降低大口径光学元件的体积和质量,薄型镜面已被广泛应用于各类天文望远系统和高功率激光系统。对薄型镜面进行合理的支撑是一个必须解决的问题,支撑系统的设计对光学成像质量以及光传输过程都有明显的影响。针对多点支撑情况下,支撑单元大小对薄型光学元件面形的影响进行了分析,建立了圆口径薄型光学元件的有限元分析模型,计算了支撑单元大小不同情况下光学元件面形的P-V、RMS值以及PSD曲线,分别从空间域与频率域上得到了支撑单元大小与镜面面形畸变之间的响应特性,根据计算结果,给出了不同的光学系统选择支撑单元应遵循的基本原则。
In order to reduce the size and quality of large-aperture optical components, thin mirrors have been widely used in various types of astronomical telescopic systems and high-power laser systems. Reasonable support for the thin mirror is a problem that must be solved. The design of the support system has a significant impact on the optical imaging quality and optical transmission process. In the case of multi-point support, the influence of the support unit size on the profile of the thin optical element is analyzed. The finite element analysis model of the circular aperture thin optical element is established, and the PV of the optical element is calculated under different support unit sizes. RMS value and PSD curve, the response characteristics between the size of the supporting unit and the distortion of the specular surface are respectively obtained from the spatial and the frequency domain. According to the calculation results, the basic principles to be followed in choosing the supporting unit for different optical systems are given.