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给出一种测量激光器稳定运转时增益介质中热透镜焦距的方法。像散腔在确定的腔型参数下,存在一个辅助透镜(等效为热透镜)使子午面和弧矢面内的光束参数相同,利用ABCD矩阵理论建立起此时的像散稳定腔腔长与辅助透镜的关系。按此腔型搭建谐振腔后,通过直接观察激光器输出光斑的形状就可获得腔长与抽运功率的关系;通过腔长建立起腔长、热透镜焦距与抽运功率的关系后,即可得到不同抽运功率下增益介质的热透镜焦距大小。
A method of measuring the focal length of the thermal lens in the gain medium when the laser is running steadily is given. Astigmatic cavity In the cavity parameters determined, there is an auxiliary lens (equivalent to the thermal lens) so that the meridian and sagittal beam parameters within the same beam, the use of ABCD matrix theory to establish this time the astigmatism stable cavity length and Auxiliary lens relationship. After the cavity is built, the relationship between the cavity length and the pumping power can be obtained by directly observing the shape of the laser output spot. After the cavity length is established, the relation between the focal length of the thermal lens and the pumping power can be established Get the thermal lens focal length of the gain medium under different pumping power.