Abstract

Spectroscopic properties of as-grown and γ-irradiated undoped and Bi-doped α-BBO (BaB2O4) single crystals were investigated. Bi2+ and color centers in Bi:α-BBO crystals were investigated to be nonluminescent in the near-infrared (NIR) region. Broadband NIR luminescence at 1139nm with a FWHM of 108nm and a decay time of 526μs was realized in Bi:α-BBO crystal through γ irradiation. Bi+ was attributed to be responsible for the NIR emission, which can be bleached by thermal annealing. The involved physical processes in Bi:α-BBO crystal during the courses of irradiation and heat annealing were tentatively established.

© 2009 Optical Society of America

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