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Proceedings Paper

VIS-IR transmitting BGG glass windows
Author(s): Shyam S. Bayya; Geoff D. Chin; Jasbinder Singh Sanghera; Ishwar D. Aggarwal
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Paper Abstract

BaO-Ga2O3-GeO2 (BGG) glasses have the desired properties for various window applications in the 0.5-5 μm wavelength region. These glasses are low cost alternatives to the currently used window materials. Fabrication of a high optical quality 18" diameter BGG glass window has been demonstrated with a transmitted wave front error of λ/10 at 632 nm. BGG substrates have also been successfully tested for environmental weatherability (MIL-F-48616) and rain erosion durability up to 300 mph. Preliminary EMI grids have been successfully applied on BGG glasses demonstrating attenuation of 20dB in X and Ku bands. Although the mechanical properties of BGG glasses are acceptable for various window applications, it is demonstrated here that the properties can be further improved significantly by the glassceramization process. The ceramization process does not add any significant cost to the final window material. The crystallite size in the present glass-ceramic limits its transmission to the 2-5 μm region.

Paper Details

Date Published: 26 September 2003
PDF: 8 pages
Proc. SPIE 5078, Window and Dome Technologies VIII, (26 September 2003); doi: 10.1117/12.487723
Show Author Affiliations
Shyam S. Bayya, Naval Research Lab. (United States)
Geoff D. Chin, Naval Research Lab. (United States)
Jasbinder Singh Sanghera, Naval Research Lab. (United States)
Ishwar D. Aggarwal, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 5078:
Window and Dome Technologies VIII
Randal W. Tustison, Editor(s)

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