Abstract

Barium gallogermanate (BGG) glasses are currently being explored as a viable low cost material for numerous U.S. defense and commercial visible-infrared window applications. These glasses are transparent from 0.4μm to beyond 5.0μm and can be easily made in large optics and complex shapes with high index homogeneity. For high-energy laser (HEL) applications, knowledge of the thermo-optic coefficient (dn/dT) of the window material is important in determining the optical path distortion. The dn/dT measurements were made on BGG glass at 633 and 3390  nm and compared with the values for multispectral ZnS. The dn∕dT for BGG glass was 15 the value for multispectral ZnS, giving BGG glass a clear advantage for HEL applications.

© 2007 Optical Society of America

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