中国激光, 2009, 36 (11): 3031, 网络出版: 2009-11-11
一种测量端面抽运Nd-GdVO4晶体热透镜焦距的方法
A Method for Measuring Thermal Lens Focal Length of End-Pumped Nd:GdVO4 Crystals
摘要
在半导体激光端面抽运工作条件下,激光晶体会产生剧烈的热透镜效应。利用532 nm激光作为探测光,观测探测光束通过晶体后的远场图像可以很好地评估热透镜效应程度大小。利用现有的热透镜理论结果建立了光束干涉模型,对远场光环现象进行了解释,并且分析得到了基于远场光环的热焦距计算公式。使用谐振腔稳定性法测量了热透镜焦距,并将测量结果与基于远场光环的热焦距计算结果作对比,验证了光线干涉模型的合理性及计算热焦距公式的准确性。
Abstract
Thermal lens effects are severe for Nd:GdVO4 laser crystals with a end-pumping scheme. A 532 nm laser is used as a probe beam in experiments. By detection of the far-field image of the probe beam,the thermal effect could be measured. A model is presented using beam interference theory. Based on this model,the phenomenon at far-field is explained and a new formula for calculating the thermal focal length is formed. Thermal lens measurements are also performed using a resonator stability method. The results agree well with the beam interference model and the thermal focal length formula.
项震, 付鑫, 葛剑虹. 一种测量端面抽运Nd-GdVO4晶体热透镜焦距的方法[J]. 中国激光, 2009, 36(11): 3031. Xiang Zhen, Fu Xin, Ge Jianhong. A Method for Measuring Thermal Lens Focal Length of End-Pumped Nd:GdVO4 Crystals[J]. Chinese Journal of Lasers, 2009, 36(11): 3031.