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In order to stabilize the self-biasing state of a laser gyroscope, a dual-longitudinal-mode asymmetric frequency stabilization technique was studied. The special frequency stabilization is based on the accurate control of the intensity tuning curve in the prism ring laser. In this study, the effects of the ratio of the Ne isotopes, the inflation pressure, and the frequencies coupling on the intensity tuning curve in a laser gyro were examined. The profiles of the intensity tuning curve were simulated under the mixing ratios of Ne20 and Ne22 of 1:1 and 7:3, and the inflation pressures were 350 Pa, 400 Pa, and 450 Pa. The mixing ratio of Ne20 and Ne27 was dealt with similarly. The method for precisely adjusting the profiles of the intensity tuning curve was analyzed. The profiles were verified by experiments under different isotope ratios and pressures. Finally, based on a prism ring laser with an optical length of 0.47 m, the proposed frequency stabilization method was preliminarily verified.

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For the phenomenon of degradation of the performance of total reflection prism laser gyro before and after reset jump, this paper investigates the effect of frequency stabilization on the beam shift of total reflection prism laser gyro using a matrix optics method, and proposes a method to calculate the beam shift with frequency stabilization. The numerical simulation and experimental results show that, unlike the beam shift characteristics caused by the prism temperature, the frequency stabilization additionally causes an approximately equal beam shift at each prism interface, and the shift is proportional to the frequency stabilization control amount. It is pointed out that the large abrupt change of beam propagation path before and after reset jump is the main reason for the degradation of total reflection prism laser gyro performance, and the frequency stabilization control method of reset jump once for each optical wavelength adjustment can effectively reduce the beam shift caused by frequency stabilization.