UV-laser-diode-pumped visible Tb3+:LiLuF4 lasers

We investigate the dependence of the visible laser performance of Tb3+:LiLuF3 (Tb:LLF) on the ultraviolet (UV) pumping wavelength and present the first, to the best of our knowledge, UV-laser-diode-pumped Tb3+-based laser. We find an onset of thermal effects already at moderate pump power for UV pum...

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Bibliographic Details
Published in:Optics letters 2023-07, Vol.48 (13), p.3379-3382
Main Authors: Badtke, Moritz, Kalusniak, Sascha, Tanaka, Hiroki, Kränkel, Christian
Format: Article
Language:English
Subjects:
Continuous wave lasers
Laser pumping
Semiconductor lasers
Temperature effects
Ultraviolet lasers
Wavelengths
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Summary:We investigate the dependence of the visible laser performance of Tb3+:LiLuF3 (Tb:LLF) on the ultraviolet (UV) pumping wavelength and present the first, to the best of our knowledge, UV-laser-diode-pumped Tb3+-based laser. We find an onset of thermal effects already at moderate pump power for UV pump wavelengths with strong excited-state absorption (ESA), which vanishes at pump wavelengths with weak ESA. Pumping with a UV laser diode emitting at 378.5 nm enables continuous wave laser operation in a 3-mm short Tb3+(28 at.%):LLF crystal. Slope efficiencies of 36% at 542/544 nm and 17% at 587 nm are obtained with a minimum laser threshold as low as 4 mW.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.494164