Abstract
Natural alexandrite (BeAl2O4:Cr3+)crystals are investigated as regards the effects of annealing on their optical properties. Opticalabsorption spectra are measured from the ultraviolet (190 nm) to the near infrared (900 nm), fora sample subjected to consecutive annealing processes, where time and temperature are varied.Besides this, luminescence spectra are simultaneously obtained for this sample, excited with aKr+ laser source, tuned on an ultraviolet multi-line mode (337.5, 350.7 and 356.4 nm). We observe fromabsorption as well as from emission data that annealing mainly influences the distribution ofCr3+ andFe3+ ions, located on sitesof a mirror plane (Cs symmetry), which are responsible for the optical properties of alexandrite. The resultsobtained lead to the conclusion that annealing induces a modification of the population ofCr3+ onCs sites as well as on sites located on an inversion plane(Ci).Annealing could improve the optical properties of this material, as regards its applicationas a tunable laser.
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