Journal
DEVICES AND METHODS OF MEASUREMENTS
Volume 11, Issue 4, Pages 264-271Publisher
BELARUSIAN NATL TECHNICAL UNIV
DOI: 10.21122/2220-9506-2020-11-4-264-271
Keywords
holmium; thulium; potassium rare-earth tungstates; continues-wave laser; epitaxial layer
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Funding
- Belarusian Republican Foundation for Fundamental Research grant [F19M-075]
- Ministry of Education of the Republic of Belarus [8.1.10]
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2 mu m lasers are in demand for a number of practical applications, such as environmental monitoring, remote sensing, medicine, material processing, and are also used as a pump sources for optical parametric generators. Crystals of double potassium tungstates doped with ions of rare-earth elements were shown to be promising materials both for the creation of classical solid-state lasers and waveguide lasers. The aim of this work was to develop a tunable pump laser in the spectral region of 1.9 mu m based on double tungstate crystals doped with thulium ions and to study the lasing characteristics of a Ho:KY(WO4)(2) crystal and a Ho:KGdYbY(WO4)(2) single-crystal epitaxial layer under in-band pumping. With a Ho(1at.%):KY(WO4)(2) crystal, continuous wave low-threshold lasing with an output power of 85 mW with a slope efficiency of 54 % at 2074 nm was achieved. For the first time to our knowledge, continuous wave laser generation in a waveguide configuration is realized in a single-crystal layer of potassium tungstate doped with holmium ions grown by liquid-phase epitaxy. The maximum output power at a wavelength of 2055 nm was 16.5 mW.
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