Optical heterodyne measurement of phase retardation of wave plate

@inproceedings{Lin1987OpticalHM,
  title={Optical heterodyne measurement of phase retardation of wave plate},
  author={Youzuo Lin},
  year={1987}
}
This paper discusses an optical heterodyne technique for the measurement of phase retardation of a wave plate. The accuracy of the measurement of the optical pathe difference of the wave plate is roughly equal to the wavelength devided by 6000, better than other methods. 

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