Abstract

We report on efficient diode-pumped mid-infrared lasers based on ${\rm Tm}{:}{{\rm LiYF}_4}$, ${\rm Tm}{:}{{\rm Y}_3}{{\rm Al}_5}{{\rm O}_{12}}$, and ${\rm Tm}{:}{{\rm YAlO}_3}$ crystals. These lasers operate in the continuous-wave (CW) regime and deliver watt-level output power at the wavelengths of 2.2–2.3 µm (the ${^3{{\rm H}}_4} \to {^3{{\rm H}}_5}\;{{\rm Tm}^{3 +}}$ transition). In particular, a 1.8 at. % ${\rm Tm}{:}{{\rm YAlO}_3}$ laser pumped at 789 nm generates a maximum CW output power of 1.32 W at 2272–2277 nm with a slope efficiency of 33.1% (with respect to the absorbed pump power), a linear laser polarization ($E\parallel b$), and a fundamental transverse output mode (the measured ${\rm M}_x^2 = {1.26}$, ${\rm M}_y^2 = {1.68}$). In the quasi-CW regime, the output peak power is scaled up to 2.69 W. The pump quantum efficiency and the fractional heat loading are estimated and discussed.

© 2020 Optical Society of America

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