Spectroscopic and laser gain properties of the Nd3+:β′-Gd2(MoO4)3 non-linear crystal

In this paper the polarized optical spectra (absorption and fluorescence) of the Nd3+ ion in the Gd-2(MoO4)(3) non-linear crystal have been investigated at low (10 K) and room temperature. Results obtained from low-temperature experiments have been used to obtain the energy level diagram and also to identify two non-equivalent centres of Nd3+ ions in this crystal. The Judd-Ofelt formalism is applied to the room temperature absorption spectra. and the relevant spectroscopic parameters (quantum efficiency and emission cross section) for laser applications have been estimated. Infrared-to-visible up-conversion in this host crystal is reported for the first time. Finally, continuous-wave laser experiments are carried out and from them, optimal conditions for generation of green laser light are established.