Growth of Broad Linewidth Ruby Crystals

Abstract
Progress has been achieved in perfecting the technique for the growth of ruby from flux and broadening the fluorescent linewidth by Ga additions. Line broadening was achieved in flux‐grown ruby crystals both by the deliberate addition of Ga and by the substitution of O2− by F during crystal growth. Broadening in excess of 10 cm−1 was obtained due to a combination of these factors. Solubility of pure Al2O3 in PbF2 was found to be reduced about 10% by the addition of 0.02 mole % Cr. Chemical analysis of the crystals shows a concentration gradient exists for Cr but not for Ga.

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