High-efficiency â¼2 µm CW laser operation of LD-pumped Tm3+:CaF2 single-crystal fibers.
Opt Express
; 28(5): 6684-6695, 2020 Mar 02.
Article
em En
| MEDLINE
| ID: mdl-32225910
ABSTRACT
The TmCaF2 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 Tm3+ were calculated with Judd-Ofelt theory. A systematic study of the fluorescence characteristics has been carried out. Simulated emission cross-sections of the 3F4 â 3H6 transition were calculated to be 6.68×10-21 cm-2 and 4.65×10-21cm-2 for crystal doped with 3 at.% and 4 at.% Tm3+. The 64.4% slope efficiency with output power of 2.23W was achieved in 3 at.% TmCaF2 single-crystal fiber. The slope efficiency decreased to 44.5% and maximum output power decreased to 1.65W in 4 at.% TmCaF2 single-crystal fiber. Obtained results show that Tm-doped CaF2 single-crystal fibers are promising materials for IR laser action generation.
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MEDLINE
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En
Ano de publicação:
2020
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Article