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Proceedings Paper

Growth Status of Nd,Cr:GSGG
Author(s): Robert Uhrin; Roger F. Belt
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Paper Abstract

The development of Nd,Cr:GSGG has progressed rapidly over the past few years. Two inch diameter and larger boules have been grown core free with flat interfaces. The early problems of attaining low loss at 1.06 μm, the cost and availability of scandium, and growth problems have been alleviated. The crystal composition and trace impurities in starting materials must be controlled rigidly. Active laser testing of 1/4 x 3 inch rods has demonstrated slope efficiencies of greater than 7%. Wavefront distortions at 1.06μm with a Zygo interferometer are A/4 PV along [111] for 3 inch lengths or comparable to Nd:YAG. Loss factors at 1.06Pm are typically <0.006 cm-1 or several times that of the best Nd:YAG. This may be caused by impurities, crystal quality, or intrinsic loss of the gallium garnets. The size of present boules has yielded 1/4 x 4 inch cylindrical rods and 6 x 20 x 100 mm3 slabs. These may possess growth striae which introduce a noticeable birefringence when viewed normal to the growth axis. Striae can be minimized by more stringent temperature control but their effects are governed by the stress optic coefficients. The latter must be measured accurately. The growth of 2 inch boules is discussed along with problems associated with the growth of larger crystals.

Paper Details

Date Published: 16 July 1986
PDF: 5 pages
Proc. SPIE 0610, Scientific and Engineering Applications of Commercial Laser Devices, (16 July 1986); doi: 10.1117/12.956389
Show Author Affiliations
Robert Uhrin, Airtron Division of Litton Industries, Inc. (United States)
Roger F. Belt, Airtron Division of Litton Industries, Inc. (United States)

Published in SPIE Proceedings Vol. 0610:
Scientific and Engineering Applications of Commercial Laser Devices
Rick Feinberg; Lewis Holmes; Morris Levitt, Editor(s)

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