Total Wavefront Distortion < 1/20 wave @ 10.6µm over Central 90% Clear Aperture
Wedge < 3 minutes of Arc
Surface Quality: 40/20 or better Scratch/Dig
Corners with Face Angles per dwg.
Coated: AR/AR @ 10.6µm
Standard high efficiency low loss
anti-reflectance thin film coating applied to both sides.
Reflectance per surface @ 10.6µm
for normal incidence <0.20% per surface
Total finish part Absorption < .25%
Transmission at normal incidence > 99%
Transmission at 22.5% > 98.3%