Chromium-doped glass
This Cr2O3-doped glass exhibits an extended strong UV–visible absorption up to about 740 nm. Four strong UV absorption bands are identified at about 235, 310, 350, 380 nm followed by four highly intense visible peaks at about 430, 490, 585 and 620 nm.
The irradiated Cr-sample exhibits the same UV absorption until the visible band at 430 nm after which the absorption decreases to the end of measurement.