Based on that the laser rod is equivalent to gradient index rod (GRIN), a new thermal lens focal length expression was achieved.

把激光棒等效为梯度折射率棒，得到了新的热透镜焦距公式。

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The test on its optical transmittance was conducted, and analysis of the refractive index profile of a gradient index (GRIN) rod made of the base glass was performed.

制备了自聚焦透镜的基础玻璃，对其透过率进行了测试，并对由这种玻璃制成的梯度折射率(GRIN)棒的折射率分布进行了分析。

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Based on the matrix optics, the propagation and transformation characteristics of Gaussian beam through a parabolic gradient-index rod with the spherical end surfaces are analyzed.

本文采用矩阵光学的方法，分析了高斯光束经球端面抛物型梯度折射率棒透镜的传播与变换特性。

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