1.
Opt Lett
; 44(20): 5077-5080, 2019 Oct 15.
Article
in English
| MEDLINE
| ID: mdl-31613268
ABSTRACT
The orthorhombic Tm3+:YAlO3 crystal is promising for laser operation at the H43âF43 (1.5 µm) and H43âH53 (2.3 µm) transitions. Stimulated-emission cross-sections for these transitions are determined with polarized light. Peak values of 0.59×10-20 cm2 and 0.80×10-20 cm2 are found at 1438 nm and 2275 nm, respectively, both for Eâ¥b. The cross-relaxation defining the upper-laser level lifetime is quantified. Continuous-wave lasing at the H43âH53 transition is achieved with an a-cut 1.5 at.% Tm:YAlO3 crystal. The laser generated 254 mW at 2273 nm with a slope efficiency of 17.8% and linear polarization (Eâ¥b).