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Shock-induced opacity in Gd3Ga5O12(GGG)single crystals is investigated by transmission/emission measurements at 16 wavelengths(400-800 nm),as well as complementary particle velocity measurements at 1550 nm,in the pressure range of 47-211 GPa.Optical transmission spectra through the shocked samples are measured with a in-situ,shock-generated light source,and the resultant extinction coefficients of different wavelengths and shock pressures obtained.