Configuration: Disc, Concave – Convex
Diameter: 18.000mm + 0.000mm /- 0.025mm
Center Thickness: 1.900mm +/- 0.075mm
Edge Bevels: 0.125mm +/- 0.120mm X 45deg, 1 Edge (See Drawing)
0.216mm +/- 0.120mm X 45deg, Other Edge (See Drawing)
Annular Ring Width: 0.562mm +/- 0.075mm (See Drawing)
Total Thickness Variation: 0.200mm Maximum.
Convex Spherical Radius: 22.860mm +/- 0.100mm
Concave Spherical Radius: 20.960mm Ref.only
Surface Irregularity: 3.0 Fringes Maximum @ 633nm, Both Faces.
Surface Quality: 60-40 Per MIL-PRF-13830, Both Faces.
Surface Roughness: < 80 Angstroms RMS.
Clear Aperture: Central 14.00mm Minimum Diameter, Both Faces.
Material Type / Quality: Sapphire, Optical Grade.
Crystallographic Orientation: c-Plane
Coating: Broad-band Antireflective Coated Per
Note 6 on Drawing T12-00014-01 Rev.B