Abstract
Single crystals of disordered double sodium-gadolinium tungstate NaGd(WO4)2 doped with Tm ions were grown by the Czochralski method. The polarized absorption and emission spectra of these crystals with different activator concentrations and the decay kinetics of the 3 H 4 and 3 F 4 excited states of Tm3+ ions at 300 K were investigated. The absorption and emission cross sections of the expected laser transition 3 F 4 ↔ 3 H 6 in the Tm3+ ion were determined and the amplification spectra of the active laser medium NaGd(WO4)2:Tm at different levels of inverse population of the upper laser level 3 F 4 of the Tm3+ ion were constructed. The prospects for using these crystals as active media in 2-μm solid-state lasers are discussed.
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