Abstract
Photothermochemical conversion of simple color centers (which include from one to four anionic vacancies) and highly aggregated ones in additively colored crystals of calcium fluoride doped by sodium is studied. The annealing of crystals with a low sodium content in a reducing atmosphere (additive coloration) leads to the predominant formation of simple color centers, which convert into highly aggregated centers under the joint action of heating and irradiation in absorption bands of simple centers. The irradiation of highly aggregated centers into their absorption bands and simultaneous heating causes these centers to convert into simple centers. The additive coloration of crystals with a relatively high sodium content leads to the predominant formation of highly aggregated centers. The heating of these crystals along with the irradiation in absorption bands of highly aggregated centers causes these centers to convert into simple centers. The formation of different color centers in the course of additive coloration of crystals with different impurity content and different results of photothermochemical conversion of centers in these crystals are connected with the dual action of impurities. Anion vacancies, which compensate the charge of the impurity alkali metal, facilitate the aggregation of color centers. At the same time, the alkali impurity stabilizes simple color centers.
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Original Russian Text © A.S. Shcheulin, A.K. Kupchikov, A.I. Ryskin, 2007, published in Optika i Spektroskopiya, 2007, Vol. 103, No. 3, pp. 522–527.
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Shcheulin, A.S., Kupchikov, A.K. & Ryskin, A.I. A high-stability medium based on CaF2:Na crystals with colloidal color centers: I. Photothermochemical conversion of colloidal color centers in CaF2:Na crystals. Opt. Spectrosc. 103, 507–511 (2007). https://doi.org/10.1134/S0030400X07090214
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DOI: https://doi.org/10.1134/S0030400X07090214