Abstract

Spectroscopic properties of as-grown and γ-irradiated undoped and Bi-doped α-BBO $\left(\mathrm{Ba}{\mathrm{B}}_2{\mathrm{O}}_4\right)$ single crystals were investigated. ${\mathrm{Bi}}^{2+}$ and color centers in $\mathrm{Bi}:\alpha$-BBO crystals were investigated to be nonluminescent in the near-infrared (NIR) region. Broadband NIR luminescence at $1139\mathrm{nm}$ with a FWHM of $108\mathrm{nm}$ and a decay time of $526\mu \mathrm{s}$ was realized in $\mathrm{Bi}:\alpha$-BBO crystal through γ irradiation. ${\mathrm{Bi}}^{+}$ was attributed to be responsible for the NIR emission, which can be bleached by thermal annealing. The involved physical processes in $\mathrm{Bi}:\alpha$-BBO crystal during the courses of irradiation and heat annealing were tentatively established.

© 2009 Optical Society of America

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