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Nd,Mg:LiTaO 3 single crystal with high optical quality was grown by Czochralski technique. Absorption and fluorescence spectra were investigated. The peak absorption cross section at 806.5 nm and peak emission cross section at 1091 nm are 6.81×10 −20 and 3.28×10 −20 cm 2 , respectively. The fluorescence lifetime was measured to be 129 μs. With a laser-diode as the pump source, a maximum 375 mW continuous-wave laser output at 1083 nm has been obtained with a slope efficiency of 7.2% with respect to the pump power.

Nd 3+ -doped LiLuF 4 single crystal with high optical quality was grown by Czochralski technique. The segregation coefficient of Nd 3+ in LiLuF4 crystal was determined by the inductively coupled plasma atomic emission spectrometry method. Polarized absorption and fluorescence spectra were investigated. The peak absorption cross section at 792 nm and peak emission cross section at 1053 nm are 6.94×10−20 and 7.60×10 −20 cm 2 , respectively. With a laser-diode as the pump source, a maximum 6.22 W continuous-wave laser output at 1053 nm has been obtained with a slope efficiency of 37.2% with respect to the pump power. Output power as a function of the incident pump power for the Nd:LiLuF4 laser

We present an extensive comparative analysis on the growth, the spectroscopic features, and the laser performances of room temperature Yb(5%):LiYF 4 (YLF) and Yb(5%):LiLuF 4 (LLF) crystals in the same conditions. The gain cross section, fluorescence lifetimes, laser thresholds and laser slope efficiencies are compared for the first time. It appears that Yb 3+ -doped LLF crystal might be more promising for diode-pumped high power laser operation. Intensity, a.u. ×10 3 30 25 20 15 10 5 0 45 40 35 30 25 20 15 10 5 0 Time, μs YLF LLF YLF: (2.2 ms) LLF: (2.6 ms)Room-temperature fluorescence decay curves of the grown crystals at 1025 nm

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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 Ω2 = 0.93×10 −20 cm 2 , Ω4 = 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.