Tm3+/Ho3+ co-doped LiGd(MoO4)2 (LGM) crystals were investigated as gain media for the Ho3+ laser around 2.0 μm. Polarized spectroscopic parameters of Ho3+ ions in the crystals were calculated based on the absorption spectra by the Judd-Ofelt theory. Related fluorescence spectra and decay curves were measured and analyzed for the crystals with different Tm3+/Ho3+ co-doped concentrations, 5.4/1.4 and 4.6/0.6 at.%. Stimulated emission cross sections of the 5I7→5I8 transition of Ho3+ ions were derived according to the Fuchtbauer-Ladenburg formula. End-pumped by a pulsed diode laser at 795 nm, the Ho3+ laser at 2.05 μm with a slope efficiency of 20% was realized in a c-cut crystal sample with the Tm3+/Ho3+ concentrations of 4.6/0.6 at.%.
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Tang et al. (2012) studied this question.
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