Crystal growth, spectroscopic characterization, and laser performance of Tm:LiLuF_4 crystal

摘要

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 parametersΩ_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.