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由于YAG的光弹张量和各向同性介质不同,所以热致双折射主轴方向一般不具备轴对称形式。对[001]取向的棒进行了具体计算。实验证实了计算的结果:连续运转或高重复率脉冲运转时,[001]取向棒的偏振光传输性能比[111]取向棒优越。在传输系数最大的偏振方向上,腔内放置起偏器的偏振激光输出也是最大。The principal axes of thermally induced birefringence in YAG laser rods generally do not possess axial symmetry because the strain-optic tensor of YAG crystals is different from that of isotropic materials A calculation is given for the (001) direction, the results of which are supported by experiments in which it was found that for CW or high repetition rate pulsed operation the transmission loss of (001) rods is lower than that of (111) rods. The polarized output of YAG lasers in which a polarizer was placed in the cavity was maximum where the transmission loss was minimum.
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