Measurements of optical gain in Nd3+-doped fluoroindate glasses

We report optical gain at 382 nm and 414 nm from Nd3+ doped fluoroindate glasses after excitation with lasers operating either at 583 nm or 532 nm. Stimulated emission due to a frequency upconversion process results in increase of the emitted light intensity and emission line narrowing. Large optical gain is measured by pump-and-probe spectroscopy using samples with various Nd3+ concentrations.