Effect of mirror tilt on laser oscillation mode in a planar ring cavity

Based on the Fox-Li iterative method, a planar ring cavity is modeled with optical simulation software GLAD, to study the effect of mirror tilt on the oscillation mode. The mode intensity distribution, the peak intensity position and the loss of the cavity are presented in the condition of different mirror tilts in two directions. Results show that mirror tilts result in the resonator mode distortion. With the cavity mirror tilt increasing, the loss of the cavity increases and the peak intensity moves to the edge of the mirror. Mirror tilts in the direction perpendicular to the cavity surface have more effect on the oscillation mode than in the direction parallel to the cavity surface.