角锥棱镜激光谐振腔的基本特性

 分析了角锥棱镜对光束的相位变换作用，带二面角误差的角锥棱镜可等效于6块光楔的组合，其楔角的大小和方向由二面角误差决定。对在腔内往返传输的光线在镜面上的位置进行了分析，结果表明：3个二面角误差相同且不为零的角锥棱镜构成的谐振腔为约束非稳腔。用Fox-Li迭代法数值模拟得到了不同棱镜二面角误差情况下的谐振模式。模拟结果表明：圆形镜腔情况下基本振荡模式接近于TEM₀₃模的拉盖尔高斯光束；当3个二面角误差不相同时，模式中各个区域的强度分布不对称。采用3个二面角误差基本接近且绝对值较小的棱镜可以提高光束质量。

Characteristics of cube-corner prism laser resonator

The characteristics and optical path difference of beam reflected by cube-corner prism(CCP) with dihedral angle errors were researched;the CCP with errors acts as a phase screen comprised 6 optical wedges. The positions at cavity mirror of ray which propagates back and forth in the CCP laser resonator are analyzed, it shows that the CCP resonator with three equal dihedral angle errors (three dihedral angle errors are not 0) is an unstable resonator. The CCP laser resonator mode is simulated with Fox-Li numeric method. The result shows that the CCP resonator oscillates typically in TEM(03) mode of Laguerre-Gaussian beam. The beam pattern consists of 6 pieces and looks like an asterisk. The pieces of the pattern are not symmetric and equal when the 3 dihedral angle errors are different. In order to improve the beam quality of CCP resonator, the three dihedral angle errors should be approximately equal and small.