Performance of dispersed Rayleigh interferometer on the active cophasing and alignment testbed
We report the laboratory experiment on a segmented mirror testbed that shows the use of a dispersed Rayleigh interferometer to phase segmented mirrors.Segment alignment of tip-tilt is fulfilled by overlapping diffraction pattern centroids of the three individual segments on the focal plane.A spherical interferometer is introduced to evaluate the performance of piston, tip-tilt sensing, and control closed-loop, and finally a total residual root-mean-square (RMS) surface error of about 45 nm is achieved, in which a typical error of about 20 nm is contributed by piston.These results demonstrate that the dispersed Rayleigh interferometer can successfully sense the piston of segmented mirrors and be used in phasing segmented telescopes under extensive studies.
作 者： Shanshan Wang Qiudong Zhu Weirui Zhao Lin Li Genrui Cao 作者单位： Department of Optoelectronic Engineering,Beijing Insititute of Technology,Beijing 100081,China 刊 名： 中国光学快报(英文版) ISTIC EI 英文刊名： CHINESE OPTICS OF LETTERS 年，卷(期)： 2009 07(11) 分类号： O4 关键词：