光学学报, 2016, 36 (8): 0812003, 网络出版: 2016-08-18
大口径封窗透射波前的检测方法
Measurement Method for Transmission Wavefront of Large Aperture Window
摘要
封窗经常使用在望远镜和大口径平行光管等光学系统中,置于整个系统最前端,其透射波前误差将影响整个系统的成像质量。检测手段决定加工精度,当封窗口径大于目前商用平面干涉仪的最大口径Φ800 mm时,则无法进行全口径检测。针对这一问题,提出了1种新型的封窗全口径透射检验方法,将待测封窗置于由球面干涉仪和大口径、长焦距的标准凹球面镜组成的光路中进行透射检验。利用该检测方法成功检测了一块口径为Φ856 mm、厚度为35 mm、材料为熔融石英的封窗,检测结果均方根(RMS)值为0.0191λ(λ=632.8 nm),满足设计要求。实验结果验证了该检测方法对于大口径封窗透射检验的可行性。
Abstract
The windows are often used in the telescopes and large aperture collimators. A window is placed at the front of the system, and its transmitted wavefront error has great influence on the image quality of the system. The way of measurement determines the machining precision. When the window is greater than the current commercial plane interferometer with the maximum diameter of Φ800 mm, it′s unable to carry out the full aperture testing. To solve this problem, a new method for testing full aperture window transmission is put forward that the window is put in the optical system consisting of a spherical interferometer and a concave spherical mirror with big diameter and long focal length. The method has been successfully used to test a fused silica window, with Φ856 mm diameter and 35 mm thickness. The root mean square (RMS) value of measurement result is 0.0191λ(λ=632.8 nm), which satisfies the design requirements. The feasibility of this method used in transmission measurement of large aperture windows is verified.
刘强, 徐晨, 李新南. 大口径封窗透射波前的检测方法[J]. 光学学报, 2016, 36(8): 0812003. Liu Qiang, Xu Chen, Li Xinnan. Measurement Method for Transmission Wavefront of Large Aperture Window[J]. Acta Optica Sinica, 2016, 36(8): 0812003.