Wang Xiaojing. Thermal stability of parallel-plane resonator with an internally thermal thick lens[J]. Chinese Journal of Lasers, 1985, 12(5): 266
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Optical pumping of solid-state lasers will induce axial thermal elongation and radial gradient of refractive index in the laser rod, which may be summarized as an effect of thermal thick lens. The insensitive condition of the parallel-plane resonator to thermal thick lens is directly derived by the derivative of beam spot size to the focal length of thermal lens at the output mirror of the resonator and the limitation for application is discussed.