Yb- and Er-Doped Single Crystals of Double Tungstates NaGd(WO_4)_2, NaLa(WO_4)_2, and NaBi(WO_4)_2 as Active Media for Lasers Operating in the 1.0 and 1.5 μm Ranges

摘要

Ytterbium- and erbium-doped single crystals of scheelite-like double tungstates NaGd(WO_4)_2, NaLa(WO_4)_2, and NaBi(WO_4)_2 and scheelite CaWO_4 have been grown by the Czochaalski method. The dopant concentrations in crystals are measured, and the coefficients of dopant distribution are determined to range from 0.45 to 3. The lifetimes of the Er~(3+) states ~4I_(11/2) and ~4I_(13/2) and the Yb~(3+) state ~2F_(5/2) are measured, and the absorption and luminescence spectra of the crystals are studied in the vicinity of 1.0 and 1.5 μm. The data obtained are compared with the corresponding characteristics of other crystals. The possible use of the crystals studied as active media of solid-state lasers operating in the range 1.0 and 1.5 μm is discussed.