DIAMETER: 20.00mm +/ – 0.20mm
THICKNESS: 2.00mm +/- 0.20mm
PARALLELISM: 30 ARC SECONDS MAXIMUM.
EDGE BEVEL: 0.20mm MAXIMUM FACE WIDTH X 45deg,
2 PLACES.
TRANSMITTED WAVEFRONT ERROR: 1/10 WAVE MAXIMUM AT
633nm.
CLEAR APERTURE: CENTRAL 16.00mm MINIMUM DIAMETER,
2 FACES.
SURFACE FINISH: 60-40 PER MIL-PRF-13830, WITHIN
CLEAR APERTURE, 2 FACES.
MATERIAL TYPE/QUALITY: SAPPHIRE, OPTICALL GRADE.
COATING: ANTIREFLECTIVE COATED ON BOTH FACES FOR
THE FOLLOWING VALUES:
R(avg) < 1.0% REFLECTANCE PER SURFACE
FROM 525nm TO 950nm.
R(max) < 1.0% REFLECTANCE PER SURFACE
FROM 525nm TO 950nm.
DURABILITY: PER MIL-C-48497 3.4.1.