Measurement and active reduction of the coupling of counterpropagating waves due to scattering in a laser gyroscope when it operates with a frequency biasing

In this paper we present methods of measurement and reduction of the magnitude of coupling of counterpropagating waves in a laser gyroscope when it operates with a frequency biasing. The proposed complex methods for measuring this quantity are based on the amplitude modulation of one of the waves and the phase restoration of the beat signal. The obtained values of the waves coupling magnitude were used to control piezoelectric actuators that regulate the gyroscope cavity geometry in order to minimize the counterpropagating waves coupling. The magnitude of the coupling decreased in 2-5 times.