Spectroscopic properties and laser performance of Tm~(3+)-doped NaLa(MoO_4)_2 crystal

摘要

Detailed polarized spectral properties of Tm~(3+):NaLa(MoO_4)_2 crystal have been investigated. The polarized absorption spectra, polarized fluorescence spectra, and fluorescence decay curves were measured at room temperature. The fluorescence decay mechanisms of the ~1G_4 and ~3H_4 multiplets were discussed. Spectroscopic parameters related to the laser operation at around 1.9 μm via the ~3F_4→~3H_6 transition have been evaluated. Room-temperature quasi-cw 1.9 μm laser emission from a Ti:sapphire laser pumped Tm~(3+): NaLa(MoO_4)_2 crystal has been demonstrated. The maximum output power of 0.5 W has been achieved with a slope efficiency of 50%.