11 October 2010 Nonlinearity analysis of dual-frequency laser interferometer with two longitudinal modes
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Abstract
The nonlinearity error of the dual-frequency laser interferometer with two longitudinal modes and special subsequent electrical signal processing system was studied. The expressions for the output signal pair were derived based on the theoretical analysis when the nonlinearity existed. From the above it was given that the nonlinearity makes the frequency-mixing output signals shift and undulate, and its main factors are the perfection degree of the optical system adjustment and the polarization splitting degree of the polarization beam splitter. The maximum signal shift amplitude was close to that observed on oscillograph and it could be used to estimate the perfection degree of the optical system adjustment and determine the maximum interpolation number in the subsequent signal processing stage.
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Tao Zhang, Yanhua Wu, Lu Dong, "Nonlinearity analysis of dual-frequency laser interferometer with two longitudinal modes", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76562M (11 October 2010); doi: 10.1117/12.865350; https://doi.org/10.1117/12.865350
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