Description:
<jats:p>We report on a polarization-resolved spectroscopic study of Sm<jats:sup>3+</jats:sup>-doped monoclinic KGd(WO<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub> crystals. The transition probabilities for Sm<jats:sup>3+</jats:sup> ions were calculated using a modified Judd-Ofelt theory. For the <jats:sup>4</jats:sup>G<jats:sub>5/2</jats:sub> → <jats:sup>6</jats:sup>H<jats:sub>9/2</jats:sub> transition in the red spectral range, the stimulated-emission cross-section is 5.59×10<jats:sup>-21</jats:sup> cm² at 649.0 nm (for light polarization <jats:bold><jats:italic>E</jats:italic></jats:bold> || <jats:italic>N</jats:italic><jats:sub>p</jats:sub>) and the luminescence lifetime of the <jats:sup>4</jats:sup>G<jats:sub>5/2</jats:sub> state is 719 μs (0.4 at.% Sm<jats:sup>3+</jats:sup>-doping). Sm:KGd(WO<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub> is promising for orange and red lasers.</jats:p>