Dispersion of barium gallogermanate glass.
Gallogermanate glasses are the subject of intense study as a result of their unique combination of physical and optical properties, including transmission from 0.4 to beyond 5.0 microm. These glasses can be easily made into large optics with high-index homogeneity for numerous U.S. Department of Defense and commercial visible-IR window applications such as reconnaissance, missile domes, IR countermeasures, avionics, and collision avoidance on automobiles. These applications require a knowledge of the refractive index of glass throughout the region of transmission. Consequently, we have measured the refractive index of BaO-Ga2O3-GeO2 glass from 0.4 to 5.0 microm and calculated the Sellmeier coefficients required for optical device design.
Zelmon
David E
DE
Materials Directorate, U.S. Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433-7707, USA. david.zelmon@wpafb.af.mil
Bayya
Shyam S
SS
Sanghera
Jasbinder S
JS
Aggarwal
Ishwar D
ID