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Thermal lens determination of LD end-pumped solid-state laser with stable resonator by slit scanning method
Authors:Jiaan Zheng  Shengzhi Zhao  Lei Chen
Abstract:A simple method to determine the thermal focal length of LD end-pumped solid-state laser with stable resonator is presented. The M2 factor describing the quality of the beam can be obtained by scanning a slit through the multi-mode Gaussian beam field. The waist width of the beam and the corresponding TEM00 under the same parameters of laser are then deduced through the law of multi-mode Gaussian beam propagation. Based on the standard matrix theory of stable resonator, the thermal focal length of the gain medium can be easily achieved. To show the application of this approach, the thermal focal length of an LD pumped Nd:YVO4 laser is measured and the experimental results are in agreement with the theoretical prediction.
Keywords:End-pumped laser  Slit scanning method  M2 factor  Thermal lens
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