Abstract
Laser action has been obtained at room temperature in liquid Nd3+–SeOCl2 solutions in the 4F3/24I13/2 transition of Nd3+ at 1330 nm. The cross section for stimulated emission at this wavelength is ∼7×10−21 cm2, about elevenfold less than the cross section for stimulated emission at 1056 nm. Correspondingly the thresholds for stimulated emission at 1330 nm exceed those for 1056 nm emission by one order of magnitude.