Crystal-host Gd_(0.5)Lu_(0.5)VO_4 for Ln~(3+)-lasants: a new high-gain many-phonon χ~((3))-active tetragonal vanadate—SRS spectroscopy and nonlinear-laser effects

摘要

We found that tetragonal Gd_(0.5)Lu_(0.5)VO_4- known as host-crystal for Ln~(3+)-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.