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Proceedings Paper

Single Crystal Growth Of 13"-Alumina
Author(s): Roger F. Belt; Joseph A. Catalano
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Paper Abstract

A flux procedure has been developed to grow cm size single crystals of 8"-alumina with composition Na1.67Mg 0.67A110.33017. The melt containers were iridium crucibles of 9 cm diameter x 9 cm height. The heating and flux evaporation were conducted at 1800-1900°C by means of 450 KHz radio frequency power. Single crystals up to 3-5mm thick and 5-10cm2 in area were obtained within a few days. In order to obtain larger single crystals, variations of the seeded solution method were used since 13"-alumina crystals melt incongruently. This procedure is complicated by high Na2O solvent vapor pressure at 1800°C growth temperature. Radial thermal gradients must also be minimized for best results. The quality of our crystals is good as judged by passive tests usually applied to laser rods. Doped runs of Vi-alumina were prepared for investigation as laser materials. These included rare earths and first transition elements grown in, diffused in, or both. Experiments on Ce34", Cr3+-Nd3+, and Ti3+ are described. The implications of the structural site where the dopant ion enters is discussed in reference to energy transfer and possible tunable laser action.

Paper Details

Date Published: 23 June 1986
PDF: 5 pages
Proc. SPIE 0622, High Power and Solid State Lasers, (23 June 1986); doi: 10.1117/12.961183
Show Author Affiliations
Roger F. Belt, Airtron Division of Litton Industries, Inc. (United States)
Joseph A. Catalano, Airtron Division of Litton Industries, Inc. (United States)

Published in SPIE Proceedings Vol. 0622:
High Power and Solid State Lasers
William W. Simmons, Editor(s)

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