Substrate Glass: |
UV synthetic quartz glass |
Outer Diameter: |
101.6, -0.2/0mm (DIA 4-inch) |
Thickness: |
6.0, -0/+0.2mm |
Hole Process: |
Central hole/through - 45-DEGREE-AXIS HOLE (+/-0.5 deg tolerance)
Diameter D= 12.7 +/-0.1mm (minor-axis of P-Ag coated front surface)
Note: chip control <0.2mm |
Surface Quality: |
Double side fine polished; 10-5 scratch and dig |
Flatness: |
< Lamda/10 @ 633nm over clear aperture |
Parallelism: |
<1 arc minute |
Chamfer: |
< 0. 35 -0.50mm x 45-deg |
Coating: |
Front Surface: Single-side Silver coating, protective SiO overcoat
Note: full-surface coating process after hole drilled Bottom Surface: optical polished 10-5 S/D, <Lamda/10 @ 633nm over clear aperture; Uncoated |
Reflectivity: |
Ravg>97% from 450nm-2,000nm, Ravg>95% from 2,000nm - 20,000um
Ravg>96% from 400nm-700nm, Ravg>96% from 700nm-2,000nm)
Note: protective SiO overcoat protects from oxidation Silver coating highly reflects in visible and NIR range | |
Clear Aperture: |
> 90% of reflective surface |
Pictures:
Front/Back Surfaces: |
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Packaging: |
Vacuum packaged(sealed) |