Spectroscopic assessment of Dy3+:LiLa(MoO4)2 crystal as an active medium for all-solid-state direct yellow-emitting lasers

The spectroscopic properties of the Dy3+:LiLa(MoO4)2 crystal prepared by the Czochralski method, have been investigated so as to assess its potentialities for direct yellow laser operation upon excitation with blue–violet or near UV laser diodes. Optical absorption, excitation, emission and fluorescence decay measurements have been performed at room temperature. An intense yellow emission band with favorably high yellow-to-blue luminescence intensity ratio has been observed in the visible region, and relevant parameters for laser applications have been determined in accordance with the Judd–Ofelt theory and Füchtbauer–Ladenburg formula. Based on analysis of Dy3+ concentration dependence of fluorescence lifetime, the energy transfer among Dy3+ ions by the dipole–dipole interaction has been found to be responsible for the fluorescence self-quenching of the 4F9/2 upper laser level at higher dopant concentration. The prospect of the Dy3+:LiLa(MoO4)2 crystal for the realization of efficient yellow laser systems has been discussed.

► Detailed spectral properties of the Dy3+:LiLa(MoO4)2 crystal have been investigated.
► The interaction between Dy3+ ions has been proved to be of dipole–dipole type.
► The crystal exhibits favorably large emission cross sections and (Y/B) ratio.
► The spectral parameters are comparable to those of the Dy3+:YAl(BO3)4 crystal.
► The crystal shows the potential of direct yellow laser generation.