Optical spectroscopy and visible stimulated emission of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Dy</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>ions in monoclinic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi><mml:mo>−</mml:mo><mml:mi mathvariant="normal">KY</mml:mi><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">WO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi><mml:mo>−</mml:mo><mml:mi mathvariant="normal">KGd</mml:mi><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">WO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>crystals

The complex crystallographic, spectroscopic, and laser properties of ${\mathrm{Dy}}^{3+}$ ions in $\ensuremath{\alpha}\ensuremath{-}\mathrm{KY}({\mathrm{WO}}_{4}{)}_{2}$ and $\ensuremath{\alpha}\ensuremath{-}\mathrm{KGd}({\mathrm{WO}}_{4}{)}_{2}$ single crystals are investigated. Individual Stark levels for many of the ${}^{2S+1}{L}_{J}$ manifolds of ${\mathrm{Dy}}^{3+}$ ${(4f}^{9})$ ions in these monoclinic tungstates are obtained from luminescence and absorption spectra up to \ensuremath{\approx}28 000 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ at \ensuremath{\approx}15 K. A crystal-field splitting analysis for the majority of these manifolds is performed. The rms deviation between 73 experimental and calculated ${\mathrm{Dy}}^{3+}$ Stark levels for both crystals was \ensuremath{\approx}10 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$. Theoretical calculations of intermanifold intensity parameters are carried out by methods using the Judd-Ofelt approach with regard to interconfiguration interaction. All luminescence channels originating from levels of the metstable ${}^{4}{F(3)}_{9/2}$ state are compared with measured data. Pulsed stimulated emission in the visible range at the wavelengths of two lasing channels ${}^{4}{\stackrel{\ensuremath{\rightarrow}}{{F(3)}_{9/2}}}^{6}{H}_{13/2}$ and ${}^{4}{\stackrel{\ensuremath{\rightarrow}}{{F(3)}_{9/2}}}^{6}{H}_{11/2}$ of ${\mathrm{Dy}}^{3+}$ ions are excited and identified. On the basis of observed spectroscopic data we determine the peak cross section for all observed induced transitions as well. We conclude that ${\mathrm{Dy}}^{3+}$-doped monoclinic tungstates $\ensuremath{\alpha}\ensuremath{-}\mathrm{KGd}({\mathrm{WO}}_{4}{)}_{2}$ and $\ensuremath{\alpha}\ensuremath{-}\mathrm{KY}({\mathrm{WO}}_{4}{)}_{2}$ are very attractive crystalline materials for generating visible laser light.

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