High quality Tm-doped LiLuF 4 (Tm:LLF) single crystal was grown by the Czochralski technique. Room temperature absorption spectrum and fluorescence spectrum of the Tm:LLF crystal were measured and analyzed. Based on Judd-Ofelt approach, the intensity parameters Ω λ (λ = 2,4,6) were calculated to be Ω 2 = 0.93×10 -20 cm 2 , Ω 4 = 1.19×10 -20 cm 2 , and Ω 6 = 1.75×10 -20 cm 2 . Other spectroscopic parameters that relate to laser performance were also obtained. Finally, laser performance of Tm:LLF crystal was investigated and 1.92 μm laser with a maximum output power of 7.16 W was obtained.
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Xiong et al. (2009) studied this question.
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