Influence of Gaussian reflectivity mirror and its tilt on the laser field distribution of plano-concave resonator

In this paper, by means of boundary finite-element method, the field distributions and eigenvalues of the fundamental mode of the plano-concave resonator with a tilted even-reflectivity plane mirror or a tilted Gaussian-reflectivity plane mirror are calculated and discussed. The results show that when the plane mirror tilts, the center of the mode distribution on it will move towards its edge along the tilting direction. When the tilt angle of the mirror is big enough, the mode will be distorted, the symmetry Gaussian distribution will disappear. Furthermore, with the increasing of the tilt angle the far field distributions become bad, and the eigenvalues decrease. Under the same conditions, the mode distortions induced by the tilted mirror are smaller for the plano-concave resonator with