Growth and Spectroscopic Studies of NaLa(MoO_(4))_(2):Tm~(3+) Crystals: A New Promising Laser Material

摘要

Single crystals of scheelite-like disordered double molybdate NaLa(MoO_(4))_(2) doped with thulium ions with dopant concentrations of 3.0 X 10~(19) and 1.2 X 10~(20) cm~(-3) are grown by the Czochralski method. Spectral and luminescent studies of crystals grown are performed in wavelength ranges of 800 nm (the transitions ~(3)H_(6) <-> ~(3)H_(4)) and 2 (mu)m (the transitions ~(3)H_(6) <-> ~(3)F_(4)), including the measurements of the polarized absorption and luminescence spectra of these crystals and the decay kinetics of their excited states. A model that satisfactorily describes the decay kinetics of the luminescence from the ~(3)H_(4) level taking into account cross-relaxation interactions is proposed. The prospects for the use of these crystals as active media in two-micrometer solid-state lasers are discussed.