High precision measurement for asymmetry of backscattering coupling coefficient in square passive ring cavity

Wei Tian; Meixiong Chen; Jie Yuan; Guangmin Xu

doi:10.1117/12.2199838

8 October 2015 High precision measurement for asymmetry of backscattering coupling coefficient in square passive ring cavity

Wei Tian, Meixiong Chen, Jie Yuan, Guangmin Xu

Author Affiliations +

Proceedings Volume 9677, AOPC 2015: Optical Test, Measurement, and Equipment; 96771S (2015) https://doi.org/10.1117/12.2199838
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

A device and procedure for measuring the asymmetry of backscattering coupling coefficients in square passive resonant cavity are described in this article. The asymmetry means that the two backscattering (BS) coupling coefficients r₁ (in CW direction) and r₂ (in CCW direction) are unequal, where CW and CCW correspond to clockwise and counter-clockwise directions respectively. It has been proved theoretically that a laser gyro will have a smaller lock-in threshold when the asymmetry of backscattering coupling coefficient is lower. The relative difference of BS coupling parameters for oppositely directed waves in ring cavity (RC) used in experiments is measured with high accuracy in measuring each BS coupling parameter. The system contributes to forecast the lock-in threshold of the laser gyro when assembling its square resonant cavity. Those research results are important for high precision laser gyro.

Citation Download Citation

Wei Tian, Meixiong Chen, Jie Yuan, and Guangmin Xu "High precision measurement for asymmetry of backscattering coupling coefficient in square passive ring cavity", Proc. SPIE 9677, AOPC 2015: Optical Test, Measurement, and Equipment, 96771S (8 October 2015); https://doi.org/10.1117/12.2199838

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