Host-dependence of Trivalent Erbium (Er3+) Spectra Relevant to Solid- state Lasers: Yttrium Aluminum Garnet (YAG) and Sesquioxides

摘要

The U.S. Army Research Laboratory is developing technologies for power-scalable solid-state lasers operating at cryogenic temperatures. We have particular interest in operation at wavelengths that present the least risk of ocular damage, resulting in considerable focus on trivalent erbium (Er3+). We have carried out extensive comparisons of the spectra of Er3+ in two particularly promising types of oxide crystals: yttrium aluminum garnet (YAG) and various cubic sesquioxides. This report presents many of the principal results of this study. Er:YAG has more favorable properties for room- temperature laser operation, but some Er-doped sesquioxides appear more advantageous for operation at and near liquid nitrogen temperature.