高斯反射镜及其倾斜对平凹腔激光场分布的影响
Influence of Gaussian reflectivity mirror and its tilt on the laser field distribution of plano-concave resonator
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摘要: 从菲涅尔-基尔霍夫衍射积分公式出发，运用边界元法数值计算了平凹腔平面镜均匀反射率时倾斜和未倾斜情况下基模的场强分布、相位分布和本征值，同时与高斯反射率平面镜在腔镜倾斜时的情况做了比较。研究表明，腔镜倾斜使激光场模式分布沿发生倾斜的方向向镜边缘偏移，而且在腔镜倾斜较严重时模式分布发生畸变，不再是对称的高斯分布，基模本征值随倾斜角增大而变小，光束远场分布变差。同等条件下，高斯反射率平凹腔腔镜倾斜对谐振腔引起的模畸变小于均匀反射率平凹腔，且基模光场及本征值随镜倾斜的变化关系稍不同于均匀反射率平凹腔。Abstract: 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
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