Excited-state absorption and stimulated emission measurements in Cr4+:forsterite

Polarized cw and time-resolved excited-state absorption spectra were measured in Cr4+-doped Mg2SiO4 in the 200-2200 nm spectral region, Polarization-dependent excited-state absorption was observed in the infrared due to the T-3(2) --> T-3(1a) transitions extending from 1100 to 2100 nm, in the visible between 600 and 800 nm (E\\alpha) due to the T-3(2) --> T-3(1b) transition, as well as in the UV range from 200 to 450 nm, likely due to the charge transfer transitions. Stimulated emission between 1100 and 1500 nm was observed in Cr4+:Mg2SiO4 for E\\b polarization.