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中文摘要：
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。
英文摘要：
A simple method using an astigmatic cavity to determine the thermal lens of laser crystals is reported. At certain resonator parameters there is a certain thermal focal length, which meets the requirement of making the beam size equal at the tangential and sagittal planes. Based on the ABCD matrix, the relation between the cavity length and the focal length is obtained. The relation between the cavity length and the pump power can be established by observing the spot pattern. Thus, the thermal lens length can be obtained by a middle parameter, that is, the cavity length.
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Suppressing the preferential s-polarization oscillation in a high power Nd:YVO4 laser with wedge las
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