Crystal-host Gd0.5Lu0.5VO4 for Ln3+-lasants: a new high-gain many-phonon χ(3)-active tetragonal vanadate—SRS spectroscopy and nonlinear-laser effects

We found that tetragonal Gd0.5Lu0.5VO4—known as host-crystal for Ln3+-lasants—is an attractive optical material for Raman laser converters. We discovered and investigated its almost sesqui-octave Stokes and anti-Stokes lasing comb resulting from four SRS-promoting vibration modes in combination with cascaded and cross-cascaded many-phonon χ(3)-nonlinear interactions. Furthermore, estimations of the steady-state Raman gain coefficient have been performed.