Comparative spectroscopic and thermo-optic study of Tm: LiLnF (Ln = Y, Gd, and Lu) crystals for highly-efficient microchip lasers at ~2 μm
Optical Materials Express, ISSN: 2159-3930, Vol: 7, Issue: 3, Page: 844-854
2017
- 41Citations
- 9Captures
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Article Description
We report on a detailed comparative study of the spectroscopic and thermo-optic properties of tetragonal Tm:LiLnF (Ln = Y, Gd, and Lu) crystals indicating their suitability for highly-efficient microchip lasers diode-pumped at ~791 nm and operating at ~1.91 μm. An a-cut 8 at.% Tm:LiYF micro-laser generated 3.1 W of linearly polarized output at 1904 nm with a slope efficiency of η = 72% and a laser threshold of only 0.24 W. The internal loss for this crystal is as low as 0.0011 cm. For 8 at.% Tm:LiGdF4 and 12 at.% Tm:LiLuF lasers, the output power reached ~2 W and η was 65% and 52%, respectively. The thermal lens in all Tm:LiLnF crystals is weak, positive and low-astigmatic. The potential for the Tm:LiLnF lasers to operate beyond ~2 μm due to a vibronic coupling has been proved. The Tm:LiYF vibronic laser generated 375 mW at 2026-2044 nm with η = 31%. The Tm:LiLnF crystals are very promising for passively Q-switched microchip lasers.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85014083743&origin=inward; http://dx.doi.org/10.1364/ome.7.000844; https://www.osapublishing.org/abstract.cfm?URI=ome-7-3-844; https://www.osapublishing.org/viewmedia.cfm?URI=ome-7-3-844&seq=0; https://opg.optica.org/abstract.cfm?URI=ome-7-3-844; https://dx.doi.org/10.1364/ome.7.000844; https://opg.optica.org/ome/abstract.cfm?uri=ome-7-3-844
The Optical Society
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