期刊
IEEE JOURNAL OF QUANTUM ELECTRONICS
卷 55, 期 6, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JQE.2019.2943477
关键词
Solid-state lasers; laser transitions; mid-infrared; spectroscopy
资金
- French Agence Nationale de la Recherche (ANR) through the LabEx EMC3 Project FAST-MIR
- European Community funds FEDER
- Normandy Region
The H-3(4) -> H-3(5) transition of Thulium ions (Tm3+), which features laser emission at similar to 2.3 mu m is studied in details. We revise the conditions for efficient laser operation using a rate-equation model accounting for the ground-state bleaching, cross-relaxation and energy-transfer upconversion (ETU). We show that ETU has a crucial role in reaching more than unity pump quantum efficiency (QE) for similar to 2.3 mu m Tm lasers based on highly-doped crystals. A Ti:Sapphire pumped quasi-continuous-wave 3.5 at.% Tm:LiYF4 laser generated 0.73 W at 2306 nm with a record-high slope efficiency of 47.3% (versus the absorbed pump power, for double-pass pumping) featuring a QE of 1.27. Diode-pumping of this crystal yielded a peak output power of >2 W. The first 2.3 mu m Tm waveguide laser is also reported based on Tm:LiYF4 epitaxial layers with even higher doping of 6.2 at.% generating 0.23 W with a slope efficiency of 19.8%. The spectroscopic properties of Tm:LiYF4 relevant for the similar to 2.3 mu m laser operation are revised as well.
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