Acta Photonica Sinica, Volume. 45, Issue 8, 822001(2016)
Annular Force Based on Variable Curvature Mirror Technique
Based on the elasticity theory of thin plates, the basic analysis on annular line load model and deflection equations based on this model was given. Aiming to generate a large saggitus variation using a smaller force, mathematical analysis on different mirror thickness and actuate ring radius was done by using MATLAB, the corresponding optimal value is 2~4 mm and 1/2 mirror's clear radius. One QeB variable curvature mirror prototype, whose diameter and thickness is 100 mm and 3 mm respectively was designed, fabricated and the whole structure's first ten vibration mode analysis was given. The surface accuracy of the assembled prototype is nearly λ/30. Finally, the capability in altering curvature and maintaining surface figure accuracy was tested experimentally. By improving the variable curvature mirror structure, the QeB variable curvature mirror could provide a saggitus more than 30 wavelengths(632.8 nm) and the degradation of surface figure accuracy is weakly correlated to the variation of radius of curvature.
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XIE Xiao-peng, ZHAO Hui, LI Chuang, FAN Xue-wu, REN Guo-rui, CHAI Wen-yi, XU Liang, SU Yu. Annular Force Based on Variable Curvature Mirror Technique[J]. Acta Photonica Sinica, 2016, 45(8): 822001
Received: Jan. 21, 2016
Accepted: --
Published Online: Sep. 12, 2016
The Author Email: Xiao-peng XIE (xiexiaopeng324@163.com)