本文建立了环形激光器输出光椭圆度的数学模型, 计算分析了输出片的应力作用对顺时针和逆时针方向输出光椭圆度的非对称影响。搭建了环形激光器双光路稳频系统, 测量了顺时针和逆时针方向的输出光椭圆度。从理论和实验上证明了在输出片应力作用的影响下, 通过测量顺时针和逆时针方向的输出光椭圆度进行调腔的方法不能实现环形激光器的非共面控制。

A mathematic model for calculating the ellipticity of the output beams in square planar ring resonators is given. By analyzing the mathematic model, the stress effect of the output mirror has the unsymmetrical influence on the clockwise and counterclockwise ellipticities of output beams. Moreover, the validity of the theoretical analysis is verified by the experiment. Based on these novel results, the method for aligning the light path, which is aligned by measuring the clockwise and counterclockwise ellipticities of output beams, cannot control the distortion angle of square ring resonators effectively.