Nd∶YAG激光晶体单程损耗的研究

Research on the Single Pass Loss of Nd∶YAG Crystal

本文对导致Nd∶YAG激光晶体单程损耗的原因进行了分析 ,并建立了一套精确测量Nd∶YAG激光晶体单程损耗系数的测试系统。选用了与以往测量损耗系数方法不同的测试思路。通过该系统可直接测量激光工作波长单次通过Nd∶YAG晶体时所引起的光损耗。文中对测试物理过程及数学模型的建立进行了阐述 ,并分析了端面反射率对测试结果的影响 ;研究了各种生长缺陷对激光工作波长所造成的损耗 ;讨论了测试不同通光面晶体损耗的方法 ;并实现了计算机全过程的自动数据采集及处理。

For the sake of limitation of technics of crystal growth,there are some weaknesses such as optical unequality,impurity,growth stripe and air bubble in the crystal. These weaknesses affect the wavelength of laser seriously and lead to loss of absorbing and dispersion. In this paper we analyzed the reasons that lead to the single pass loss of laser crystal and designed a set of accurate testing system for single pass loss coefficient of Nd∶YAG laser crystal. This system is different from that before and can directly measure the laser single pass loss coefficient through light loss.We explained the physic process of testing and the establishment of math model. At the same time,we analyzed the effects of the surface reflectivity.Some testing results and analysis were shown in the paper.