低功率激光热透镜效应的模拟及研究  

Simulation and research on thermal lens effect of low power laser

作　　者：郭政鑫 高绮妮 范紫萍 陈清楠 郑博为 彭力[1,2] GUO Zheng-xin;GAO Qi-ni;FAN Zi-ping;CHEN Qing-nan;ZHENG Bo-wei;PENG Li(School of Physics and Telecommunication Engineering,South China Normal University,Guangzhou,Guangdong 510006,China;SCNU Qingyuan Institute of Science and Technology Innovation Co.,Ltd.,Qingyuan,Guangdong 511517,China)

机构地区：[1]华南师范大学物理与电信工程学院,广东广州510006 [2]华南师大(清远)科技创新研究院有限公司,广东清远511517

出　　处：《大学物理》2021年第4期79-85,共7页College Physics

基　　金：国家自然科学基金(61975058);广州市科技计划项目(201704020137);蓝盾科技项目(LD20170209)资助。

摘　　要：与高功率激光相比,低功率激光更安全,其热透镜效应对激光功率变化更敏感,更适合用于实验教学.本文利用有限元法模拟低功率激光的热透镜效应,模拟介质温度场和等效热透镜焦距,定量探究低功率激光热透镜焦距与激光功率以及介质热吸收率、厚度的关系.模拟结果与实验数据符合良好,为探究低功率激光热透镜效应实验提供理论依据.Comparing with high-power laser,low-power laser is safer and its thermal lens effect is more sensitive to the change of laser power,so it is more suitable for experimental teaching.In this paper,the thermal lens effect of low-power laser is simulated by using the finite element method,namely,the temperature field of the medium and the focal length of the equivalent thermal lens are simulated,and the relationship between the focal length of low-power laser and the laser power as well as the thermal absorption rate and thickness of the medium is quantitatively explored.The simulation results are in good agreement with the experimental data,which provides a theoretical basis for exploring the thermal lensing effect of low-power laser.

关 键 词：低功率激光 热透镜效应 有限元模拟 热透镜焦距 

分 类 号：O436.2[机械工程—光学工程]