在分析含热透镜的非稳腔固体激光器普遍特性的基础上，分别定义了几何放大率和输出曲率半径的热敏感度，结合腔镜失调敏感度而成为设计该类谐振腔的重要依据。据此，进一步改善和发展了新型的棒成像非稳腔。

In this paper we have studied the general optical properties of unstable resonators with thermal lens inside. Thermal sensitivities of magnification and output ray curvature have been defined they constituted the important design points for the unstable resonators. Furthermore, we have improved the novel rod-imaging unstable resonator based on these design Points.