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Proceedings Paper

Correlation of sapphire quality with uniformity and optical properties
Author(s): Chandra P. Khattak; Frederick Schmid; Maynard B. Smith
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Paper Abstract

Large sapphire boules, up to 34 cm diameter, 65 kg, are being grown by the heat exchanger method (HEM) and even larger sizes are sought to meet future requirements of advanced optical systems. These boules, especially in large sizes, exhibit lattice distortion and light scatter in a very narrow range. A qualitative grading system has been developed to characterize sapphire. Windows of five grades and different orientations were prepared and measured for refractive index homogeneity to evaluate transmitted wavefront distortion. The data showed that the refractive index homogeneity for all samples was in the 10-7 (0.1 ppm) range. The fact that lattice distortion does not affect the transmitted wavefront allows fabrication of large sapphire windows in production mode at low cost.

Paper Details

Date Published: 27 June 1997
PDF: 8 pages
Proc. SPIE 3060, Window and Dome Technologies and Materials V, (27 June 1997); doi: 10.1117/12.277050
Show Author Affiliations
Chandra P. Khattak, Crystal Systems, Inc. (United States)
Frederick Schmid, Crystal Systems, Inc. (United States)
Maynard B. Smith, Crystal Systems, Inc. (United States)


Published in SPIE Proceedings Vol. 3060:
Window and Dome Technologies and Materials V
Randal W. Tustison, Editor(s)

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