Abstract
We have observed persistent spectral hole burning (PSHB) in -doped sodium borate glasses irradiated with near-IR femtosecond laser pulses. As-prepared glasses, i.e., glasses melted in air, do not show PSHB even at low temperatures , but room-temperature PSHB occurs in the irradiated glasses. The exposure to IR radiation causes both the reduction of to and the formation of intrinsic defects. We propose that the photoinduced redistribution of electric charges between to is responsible for the occurrence of PSHB.
© 2001 Optical Society of America
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