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Gaussian Beam Focused by a Thermal Lens


Thermal lens effect describes the inhomogeneity of refractive index of medium, which is induced by thermal gradient of a high power incident laser beam. For a Gaussian beam with specified parameters, the refractive index is mathematically represented as a function of temperature and input power [W. Koechner, Appl. Opt. 9, 2548–2553 (1970)]. This use case shows the variation of the focal length of the thermal lens, as well as the focus beam diameter when the input power changes. This example is published in [H. Zhong, J. Opt. Soc. Am. A 35].

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