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.
An improved system for measuring the specific modes’ total loss in high quality ring cavity is presented. The experimental apparatus measuring cavity ring-down signals are described in detail. The specific modes in the passive ring cavity can be obtained by controlling the manually piezoelectric transducer which mounted on the laser cavity mirror. The image of the specific mode was shown on the CCD and its corresponding cavity ring-down signal is obtained when incident laser light was shut off by optical switch. The losses of three specific transverse modes, such as TEM00, TEM01 and TEM10, are measured. The improved system realizes the specific mode real-time monitoring and high precision loss measurement simultaneously when the ring cavity assembling and alignment.
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