6 February 2008 Theoretical and experimental investigation of thermal effect in end-pumped Tm,Ho:YLF lasers
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Thermal lensing in an end-pumped Tm,Ho:YLF laser crystal has been investigated with a theoretical model of continuous-wave (CW) quasi-three-level laser. Under considering energy transfer up-conversion (ETU) and ground state re-absorption (GSA), the rate equations are given. The influence of ETU on fractional thermal loading is calculated, and the results show that fractional thermal loading critically depends on the pump-to-mode size ratio. The temperature distributions of a Tm,Ho:YLF crystal under different pump powers have been analyzed. The output power and the focal length of the thermal lens as a function of pump power are obtained in experiment. The experimental results are compared with theoretical results, and the experimental results show that the theoretical results are reasonable.
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Xinlu Zhang, Xinlu Zhang, Li Li, Li Li, Jinhui Cui, Jinhui Cui, } "Theoretical and experimental investigation of thermal effect in end-pumped Tm,Ho:YLF lasers", Proc. SPIE 6823, High-Power Lasers and Applications IV, 682305 (6 February 2008); doi: 10.1117/12.753394; https://doi.org/10.1117/12.753394

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