The thermal distortion of silicon reflector irradiated by high-power laser were analyzed by numerical simulation. The results indicate that the contributions from the thermo optic effect, photoelastic effect and deformation are about 97.4%, 0.65%, 1.95% for the transmitted beam. The ratio of thermal distortion between reflected beam and transmitted beam is 0.09.
The frequency stabilization error is an important error source to limit the precision of four frequency differential ring
laser gyro (DILAG) in navigation application. Different from the traditional technology mainly related to frequency
stabilization circuits design, this paper introduces a new method to solve the problem. The method can essentially
minimize the frequency stabilization sensitivity of DILAG, by applying an outer longitudinal magnetic field to the gain
region of DILAG. Through adjusting the value of magnetic field to make the frequency splitting equal to the Faraday
splitting, the minimum frequency stabilization sensitivity of DILAG will be available. The physics mechanism and
mathematic model of this method are analyzed and set up. Concrete steps to realize the method are given in detail.
Experimental results have verified its validity and it can decrease the startup drift. Hence, this new method can improve the performance of DILAG, which will be helpful to navigation application.
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