Substrate Material: |
BK7 optical glass |
Outer Diameter: |
101.6,-0.1/0mm (4 inches in diameter) |
Thickness: |
19.0,+/-0.1mm |
Surface Quality: |
Double side fine polished,40-20 scratch and dig |
Flatness: |
<lambda/4 @ 633nm per 25mm over surface on-jig tested |
Chamfer: |
2.0 +/-0.2mm x 45deg protective chamfer (both surfaces) |
Coating: |
Single-side Aluminum coating, protective SiO overcoat;
Back surface: uncoated(polished only) |
Reflectivity: |
Ravg>90% from 400nm~10um; Ravg>85% from 250nm-600nm |
Clear Aperture: |
>90% of reflective surface |
Packaging: |
Vacuum packaged(sealed) |