Design of 8-like Non-planar Cavity

摘要

For eliminating the negative effects of lock-in region and optical elements in cavity, the non-planar structure is strongly needed in laser gyro. In this paper, the theoretical formula of rotatory effect in non-planar cavity is presented deducing from basic light propagating law. Based on the 8-like plane cavity, a novel non-planar structure is designed and numerically calculated. The results show that for obtaining the required rotatory angle, it just needs to adjust the structural parameters of the original 8-like plane cavity. The four-frequency-differential laser gyro which adopts the non-planar 8-like structure has the same advantages as those with the planar 8-like structure, such as the gain region locates at one leg, the position of Faraday rotator has better spatial symmetry and the coating films of the output mirror is easily designed.