Coupling of Counterpropagating Waves in Two-and Four-Frequency Zeeman Laser Gyroscopes with a Nonplanar Cavity

The paper considers the effect of coupling of counterpropagating waves caused by scattering of radiation in two- and four-frequency Zeeman laser gyroscopes on their characteristics. Methods for measuring the magnitude of coupling of counterpropagating waves via determination of parameters of the amplitude modulation of counterpropagating waves and via reconstruction of the beat signal phase are presented. The obtained values of the coupling magnitude were used to minimize it by 2-7 times by the geometry adjustment of the gyroscope cavity. Measurements of the zero drift and other parameters of two-frequency and four-frequency laser gyroscopes at different coupling magnitudes of counterpropagating waves have been carried out.