Stimulated emission and tunable gain from Rh(2+) ions in RbCaF(3) crystals

Stimulated emission was detected in RbCaF(3):Rh(2+) crystals through the observation of power-dependent shortening of the fluorescence lifetime and narrowing of the emission band with a distinct threshold. In addition, single-pass gain was observed to be tunable between about 700 and 720 nm.