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Optical absorption and color centers in large Ti: Sapphire crystals grown by horizontally directed crystallization under reducing conditions

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Abstract

The optical absorption in large Ti: sapphire crystals (up to 175 × 175 × 40 mm in size) grown by horizontally directed crystallization with the use of zone leveling of the activator distribution in different reducing atmospheres has been investigated. It has been shown that there is a high uniformity of the optical characteristics and the distribution of color centers based on Ti3+, Ti4+, and activator-vacancy complexes in grown crystals, which is largely determined by the stability of the reduction potential of the growth medium. It has been established that the activator concentration in the Ti4+ charged state in crystals grown in the CO + H2 low-pressure atmosphere does not exceed 1.5% and accounts for 0.2–0.5% of the total activator amount in an Ar atmosphere. The Ti4+ concentration decreases to ∼0.01% after the additional reducing annealing.

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Authors and Affiliations

  1. Institute for Single Crystals, National Academy of Sciences of Ukraine, pr. Lenina 60, Kharkiv, 61178, Ukraine

    S. V. Nizhankovskii, N. S. Sidel’nikova & V. V. Baranov

Authors
  1. S. V. Nizhankovskii
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  2. N. S. Sidel’nikova
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  3. V. V. Baranov
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Correspondence to S. V. Nizhankovskii.

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Original Russian Text © S.V. Nizhankovskii, N.S. Sidel’nikova, V.V. Baranov, 2015, published in Fizika Tverdogo Tela, 2015, Vol. 57, No. 4, pp. 763–767.

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Nizhankovskii, S.V., Sidel’nikova, N.S. & Baranov, V.V. Optical absorption and color centers in large Ti: Sapphire crystals grown by horizontally directed crystallization under reducing conditions. Phys. Solid State 57, 781–786 (2015). https://doi.org/10.1134/S1063783415040216

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