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