Real-Time Measurement Method for Retardation of Eighth Waveplate Independent of Fast Axis

Real-time measurement of retardation and fast axis azimuth of wave plates is proposed. The light emitted from the laser passes through a circular polarizer and the sample successively. Then the beam is diffracted to three sub-beams by a grating. One sub-beam passes through a standard quarter-wave plate and then is split and analyzed by a Wollaston prism. The other two sub-beams are all directly split and analyzed by Wollaston prisms. Six intensities are simultaneously detected to calculate the retardation and the fast axis azimuth. Experiments show that for the quarter-wave plate the average and standard deviation of the retardation are 89.78°and 0.14°, respectively, and the maximum deviation of the fast axis azimuth is 0.6°; for the eighth-wave plate, the average and standard deviation of the retardation are 45.15°and 0.15°, respectively, and the maximum deviation of the fast axis azimuth is 0.53.

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Real-time measurement of retardation and fast axis azimuth for wave plates

Xie

Zeng

Huang

et al. 2015

J. Opt. Technol.

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非偏振分光棱镜的相移测量及其温度特性研究

Gao Shan,

Meng Chen,

Cui Shengwei

et al. 2023

激光与光电子学进展

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Nonlinear errors introduced by a nonpolarized beam splitter considerably impact the measurement accuracy of an interferometer. Therefore, it is necessary to measure phase shift characteristics introduced by the nonpolarized beam splitter and explore the compensation method of the nonpolarized beam splitter. Based on the Jones matrix method describing polarization states, we set up a measurement system for the transmission and reflection phase shifts of the nonpolarized beam splitter and the effective compensation of the reflection phase shifts. In addition, the temperature characteristics of the phase shifts are experimentally investigated. The aforementioned system uses the balanced detection method of dual photodetectors; this method exhibits high detection accuracy, good stability, and antiinterference and can also eliminate the fluctuation in light power. The results show that the reflection phase shift of the nonpolarized beam splitter is larger than the transmission phase shift, and the overall phase shift is effectively reduced by combining two nonpolarized beam splitters with almost the same reflection phase shifts. Moreover, the phase shift changes with a change in temperature. An inflection point of the minimum phase shift in the temperature characteristic curve is observed, which helps determine the optimal operating temperature of the nonpolarized beam splitter.

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Real-Time Measurement Method for Retardation of Eighth Waveplate Independent of Fast Axis

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Real-time measurement of retardation and fast axis azimuth for wave plates

Real-time measurement of retardation and fast axis azimuth for wave plates

非偏振分光棱镜的相移测量及其温度特性研究

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