摘要
对LD端面泵浦圆柱形Nd:YAG晶体产生946 nm激光的晶体热效应进行了分析。考虑晶体的准三能级结构和腔内传播功率的分布,对热转换系数进行了修改,得到了更符合实际情况的晶体内部温度场分布。当泵浦功率为15W时,晶体端面中心温度由未修改参数前的242.73℃升高到了387.43℃,提高了144.70℃。分别对修改参数前后的热透镜焦距进行了理论计算,并进行了实验测量。实验测量结果和修改参数后的理论计算值相符合。此理论将为激光谐振腔的优化设计、准三能级和三能级的热效应研究提供参考。
The thermal effect of cylindrical Nd：YAG crystal pumped by LD to generate laser at 946 nm was analyzed.Considering the quasi-three-level structure of the crystal and the distribution of transmission power in the cavity,the heat conversion coefficient was modified,which led a more actual temperature field in the crystal.When the input power was 15 W,the temperature of the center of crystal end face raised from the previous 242.73 ℃ to 387.43 ℃ after modifying the parameters,which was an 144.70 ℃ increase from the data.The thermal focal length was calculated before and after modifying the parameters respectively and the thermal focal length was measured experimentally.The results basically accord with the theoretical results which is based on the modification.The theory will provide some references for the optimal design of resonant cavity,and can be applied in the laser thermal effect research of quasi-threelevel and three-level.
出处
《红外与激光工程》
EI
CSCD
北大核心
2011年第12期2358-2364,共7页
Infrared and Laser Engineering
基金
国家自然科学基金(61078032)
