DIAMETER: 50.00mm + 0.00mm /- 0.25mm
THICKNESS: 0.750mm +/- 0.010mm
PARALLELISM: 20 ARC SECONDS MAXIMUM.
TRANSMITTED WAVEFRONT ERROR: 1 WAVE MAXIMUM OVER
ANY 1.00″DIAMETER.
SURFACE QUALITY: 10-5 PER MIL-PRF-13830, 2 FACES.
WITH NOT MORE THAN FIVE No.5 DIGS
WITHIN THE ENTIRE CLEAR APERTURE.
CLEAR APERTURE: CENTRAL 40.00mm MINIMUM DIAMETER.
EDGE BEVELS: 0.20mm MAXIMUM X 45deg, 2 PLACES.
MATERIAL TYPE/QUALITY: SAPPHIRE, OPTICAL GRADE.
CRYSTALLOGRAPHIC ORIENTATION: M-PLANE +/- 1/2 deg
COATING: NONE, NOT REQUIRED.