Diameter: 55.00mm + 0.00mm /- 0.10mm
Thickness: 5.00mm +/- 0.10mm
Parallelism: < 10 Arc Seconds
Edge Bevel: 0.20mm +/- 0.10mm x 45 Degrees, Both Edges
Transmitted Wavefront Error: 1/4 Wave Maximum @ 633nm
Surface Quality: 20-10 Per MIL-PRF-13830, Both Faces
Clear Aperture: Central 49.50mm Minimum Diameter, Both Faces
Material Type / Quality: Sapphire, Optical Grade
Crystallographic Orientation: c-Plane
Coating: Broad-Band Antireflective Coated for < 1.0% Average
Reflection From 400nm to 1000nm With a Normal Incidence
Angle, Applied to Both Faces. Last Layer to be Al2O3.