6 March 2015 Current ways and means for reduction or elimination of periodic nonlinearity in heterodyne interferometer
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Proceedings Volume 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation; 94462I (2015) https://doi.org/10.1117/12.2181172
Event: International Symposium on Precision Engineering Measurement and Instrumentation, 2014, Changsha/Zhangjiajie, China
Abstract
This paper reviews ways and means used for reduction or elimination of periodic nonlinearity in heterodyne interferometers. The periodic nonlinearity resulting from polarization mixing or frequency mixing in heterodyne interferometers was modeled into one expression, which included the initial polarization state of the laser source, the rotational alignment of the beam splitter along with different transmission coefficients for polarization states and the rotational misalignment of a receiving polarizer. Three compensation techniques, measuring two orthogonal output signals, Lissajous Compensation and Chu-Ray Algorithm, are described and discussed for reduction of periodic nonlinearity. These algorithms needed at least one fringe of motion or a constant velocity sweep to properly correct the motion. And five types of two spatially separated beam interferometer configurations are described and discussed for elimination of periodic nonlinearity to a picometer level. It is concluded that the main disadvantage of these configurations was their complex architecture with unbalanced long beam paths.
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Peng Chen, Peng Chen, Peng-cheng Hu, Peng-cheng Hu, Xue-mei Ding, Xue-mei Ding, Jiu-bin Tan, Jiu-bin Tan, } "Current ways and means for reduction or elimination of periodic nonlinearity in heterodyne interferometer", Proc. SPIE 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation, 94462I (6 March 2015); doi: 10.1117/12.2181172; https://doi.org/10.1117/12.2181172
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