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 to beyond 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 of the window material is important in determining the optical path distortion. The measurements were made on BGG glass at 633 and and compared with the values for multispectral ZnS. The dn∕dT for BGG glass was the value for multispectral ZnS, giving BGG glass a clear advantage for HEL applications.
© 2007 Optical Society of America
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