Author Affiliations
Abstract
Department of Optoelectronic Engineering, Beijing Insititute of Technology, Beijing 100081, China
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.
拼接镜面 共相位 色散瑞利干涉仪 共相位检测与控制平台 120.3180 Interferometry 120.1088 Adaptive interferometry 120.2830 Height measurements 120.6085 Space instrumentation Chinese Optics Letters
2009, 7(11): 1007
1 中国科学院半导体研究所,北京,100083
2 北京理工大学光电工程系,北京,100081
研究对环境振动和空气扰动所造成的两相干光束间常数项光程变化不敏感的自适应移相干涉系统.利用偏振分光技术,采用闭环控制,并将高频振幅调制与锁相技术相结合,建立一斩波式自适应移相干涉系统,可对环境振动引起的干涉条纹的抖动进行实时探测并予以光程补偿,将干涉条纹依次锁定在与任意相位差相对应的位置.该方法不受两相干光束间光程差大小的限制且具有高信噪比.阐述了该方法的原理,描述了所建立的系统,并给出了实验结果.
自适应移相干涉技术 声光调制 振动探测与补偿 反馈控制
