双棒Nd：YAG激光器双折射补偿未对准灵敏度的研究

Investigation of the Misalignment Sensitivity of a Birefringence-compensated Two-rod Nd:YAG Laser System

在双棒Nd∶YAG激光器中,利用一块90°石英旋转片来改变激光在两棒间的偏振态,利用一个望远镜系统在激光棒的两个主面间构成像传递光学系统,从而达到热致双折射的补偿。在这个补偿系统中,可能会产生激光棒和透镜横向或纵向未校准以及激光棒倾斜而导致的未校准等情况,我们对于激光腔内每一种未校准而产生的退偏损耗进行了理论分析。

A system for the compensation of thermally induced birefringence in laser rods that consists of two identical Nd∶YAG laser rods,a telescope to image the principal planes of the rods onto each other and a 90° quartz rotator to change the state of polarization between the rods has been investigated theroetically.In this system,there may be increase of depolarization due to the laser rod and telescope lens transversal or longitudinal misalignment.Theroetical investigation has been done onto each case.