Collection Of theses on high power laser and plasma physics, 2013, 11 (1): 0508001, Published Online: Jun. 2, 2017
Smart and Quantitative Near-Infrared Point-Diffraction Interferometer Based on the Self-Referencing Wavefront Sensor
测量 点衍射干涉仪 分束器 离轴 窗口傅里叶变换 measurement point-diffraction interferometer beam splitter off-axis windowed Fourier transform
Abstract
This paper describes the development of a novel infrared point-diffraction interferometer (IPDI), which can be readily applied to real-time quantitative phase measurement. We generate reference wave with the help of Michelson-like unit combined with a low-pass spatial filter, and extract the phase information using windowed Fourier transform algorithm from single off-axis fringes. The arrangement of the proposed setup offers a quasi-common-path geometry, which could significantly minimize the systematic errors. The proposed method of IPDI is effective and sufficient for the dynamic process measurement of small deformation with higher spatial resolution compared with the conventional off-axis scheme. The feasibility of the proposed setup is demonstrated, followed by methods of reconstruction and system calibration. The nanoscale repeatability is achieved in our experiment.
Yang Pengqian, Stefan Hippler, Casey Deen, Wolfgang Brandner, Sarah Kendrew, Miao Jie, Zhang Yanli, Zhu Jianqiang. Smart and Quantitative Near-Infrared Point-Diffraction Interferometer Based on the Self-Referencing Wavefront Sensor[J]. Collection Of theses on high power laser and plasma physics, 2013, 11(1): 0508001.