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High-efficiency ∼2 µm CW laser operation of LD-pumped Tm:CaF single-crystal fibers. | LitMetric
The Tm:CaF single-crystal fibers were successfully grown by modified temperature gradient technique method. The J-O intensity parameters, spontaneous radiative transition rates, radiative lifetimes and fluorescence branching ratios of Tm were calculated with Judd-Ofelt theory. A systematic study of the fluorescence characteristics has been carried out. Simulated emission cross-sections of the F → H transition were calculated to be 6.68×10 cm and 4.65×10cm for crystal doped with 3 at.% and 4 at.% Tm. The 64.4% slope efficiency with output power of 2.23W was achieved in 3 at.% Tm:CaF single-crystal fiber. The slope efficiency decreased to 44.5% and maximum output power decreased to 1.65W in 4 at.% Tm:CaF single-crystal fiber. Obtained results show that Tm-doped CaF single-crystal fibers are promising materials for IR laser action generation.
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