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YAG and sapphire crystals were irradiated by 800nm and 120fs laser pulses. Crystals changed to dark and absorption increased after irradiation. Irradiation induced cracks were found in SEM photograph of CZ grown sapphire. After annealing at 500 o C for an hour, absorption of YAG decreased and absorption of sapphire increased. Darkness of YAG crystal was attributed to formation of color centers,...
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