Description: Based on theoretical analysis, focusing on using Fox-Li iterative method to compute the average value of cavity oscillation modes of amplitude distribution and phase distribution. The results show that, after 300 crossover, the normalized amplitude distribution and phase distribution of virtually no change in the maximum amplitude of the mirror center, the amplitude gradually from the center to the edge of the landing phase of the mirror is no longer so noodles. But for the larger Fresnel number of parallel plane cavity, especially in the mirror center and near the plane wave is a good approximation, only the edge of the mirror, the wave just before the bend. Already found a cavity mode of representation or self-transverse mode distribution. On the other hand, analysis of the disturbance on the flat mirrors strongly inclined cavity oscillation modes. Numerical results show that destruction of the field distribution of tilted mirrors the symmetry, when the introduction of the disturbanc
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