Abstract

Monoclinic (wolframite-type) monotungstate crystals are promising for rare-earth doping. We report polarized room- and low-temperature spectroscopy and efficient high-power laser operation of such a ${{\rm Yb}^{3 + }}{:}\,{{\rm MgWO}_4}$ crystal featuring high stimulated emission cross section (${\sigma _{\rm SE}}\; = \;{6}.{2}\; \times \;{{10}^{ - 20}}\;{{\rm cm}^2}$ at 1056.7 nm for light polarization ${\rm E}\;||\;{N_m}$), large Stark splitting of the ground state (${765}\;{{\rm cm}^{ - 1}}$), large gain bandwidth (26.1 nm for ${\rm E}\;||\;{N_g}$), and strong Raman response (most intense mode at ${916}\;{{\rm cm}^{ - 1}}$). A diode-pumped ${{\rm Yb}^{3 + }}{:}\,{{\rm MgWO}_4}$ laser generated 18.2 W at ${\sim}{1056}\;{\rm nm}$ with a slope efficiency of ${\sim}{89}\% $ and a linearly polarized laser output.

© 2020 Optical Society of America

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