Abstract

We have observed persistent spectral hole burning (PSHB) in Eu3+-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 77 K, but room-temperature PSHB occurs in the irradiated glasses. The exposure to IR radiation causes both the reduction of Eu3+ to Eu2+ and the formation of intrinsic defects. We propose that the photoinduced redistribution of electric charges between Eu3+ to Eu2+ is responsible for the occurrence of PSHB.

© 2001 Optical Society of America

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