Spectral properties of Ho3+/Tm3+ co-doped β′-Gd2(MoO4)3 crystal as laser gain medium around 2.0μm

Abstract Ho 3+ /Tm 3+ co-doped β ′-Gd 2 (MoO 4 ) 3 single crystal was investigated as gain medium for Ho 3+ laser around 2.0 μm. Polarized absorption and fluorescence spectra of the crystal were measured. Polarized spectral parameters of Ho 3+ ions in the crystal were calculated and the gain curves around 2.0 μm were estimated. The fluorescence decay curves for Tm 3+ and Ho 3+ ions related to the 2.0 μm laser were measured and analyzed. The distinct coupled decay behavior for the Ho 3+ /Tm 3+ co-doped system embodies the existence of energy transfer between Tm 3+ and Ho 3+ ions.