LIN YAO, ZHOU ZHIYAO, WANG KENWENG. Optical heterodyne measurement of phase retardation of wave plate[J]. Acta Optica Sinica, 1987, 7(10): 929
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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.