Laser-induced grating spectroscopy of Cr3+-doped Gd3Ga5O12 and Gd3Sc2Ga3O12 crystals

摘要: Abstract The absorption and fluorescence spectra lifetimes of Cr3+ ions in two garnet hosts, Gd3Ga5O12 Gd3Sc2Ga3O12, were measured as a function temperature. In addition, laser-induced grating measurements made laser power write beam crossing angle for various temperatures between 10 300 K. For short writing times, population gratings are produced the observed signal dynamics used to determine properties exciton migration these materials. diffusion coefficient Gd3Ga5O12:Cr3+ was found decrease temperature is raised while Gd3Sc2Ga3O12:Cr3+ increases. Contributions from dispersion changes determined this provide information on radiationless decay excited state processes. differences results obtained materials attributed spectral effects by different crystal field splittings energy levels. long long-lived refractive index also optically induced color centers.