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5 March 2021 UV-pumping and passive Q-switching of visible Tb:LiLuF4 lasers
Hiroki Tanaka, Sascha Kalusniak, Elena Castellano-Hernández, Christian Kränkel
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Proceedings Volume 11664, Solid State Lasers XXX: Technology and Devices; 116640G (2021) https://doi.org/10.1117/12.2581807
Event: SPIE LASE, 2021, Online Only
Abstract
We report on UV-pumping of a visible Tb:LiLuF4 laser emitting at 544 and 588 nm. Pumping with a frequency-doubled Ti:sapphire laser at 359 nm significantly improves the absorption efficiency compared to conventional in-band pumping at ~488 nm and cross relaxation from the excited level 5D3 efficiently populates the upper laser level 5D4. In this way, optical efficiencies of 29% and 12%, respectively, are obtained with respect to the incident pump power. A passively Q-switched Tb:LiLuF4 laser at 544 nm using a Co2+-doped MgAl2O4 as a saturable absorber yields 23-µJ pulses at 3.5 kHz with a pulse duration of ~200 ns.
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Hiroki Tanaka, Sascha Kalusniak, Elena Castellano-Hernández, and Christian Kränkel "UV-pumping and passive Q-switching of visible Tb:LiLuF4 lasers", Proc. SPIE 11664, Solid State Lasers XXX: Technology and Devices, 116640G (5 March 2021); https://doi.org/10.1117/12.2581807
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KEYWORDS
Absorption
Q switches
Visible radiation
Terbium
Ultraviolet radiation
Laser crystals
Sapphire lasers
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