Substrate: |
Schott B270 glass |
Outer Diameter: |
25.4,-0.2/+0.0mm |
Thickness: |
3.0,+/-0.1mm |
Surface Quality: |
Double side fine polished (40-20 scratch and dig, MIL Standard) |
Clear Aperture: |
>80% of outer diameter |
Flatness: |
< Lambda/10 @ 632.8nm over clear aperture on-jig tested |
Surface Coating: |
Amorphous silicon coating layer, thickness 150+/-10nm
SiO2 buffer layer 5-10nm, to enhance the adhesion of over coating with glass(SiO2) |
Back Surface: |
Polished/uncoated |
Edge Surface: |
Ground, with protection chamfer 0.3mm x 45deg | |