DIAMETER: 0.280″+/-.005″
THICKNESS: 0.0394″+/-.0010″
PARALLELISM: 3 ARC MINUTES MAXIMUM.
EDGE BEVEL: LIGHT PROTECTIVE BEVEL X 45 Deg,
2 PLACES.
FLATNESS: 1/2 WAVE MAXIMUM OVER CENTRAL 0.070″
DIAMETER, 2 FACES.
SURFACE FINISH: 80-50 PER MIL-PRF-13830, 2 FACES.
MATERIAL TYPE/QUALITY: SAPPHIRE, OPTICAL GRADE.
CRYSTALLOGRAPHIC ORIENTATION: C-AXIS PERPENDICULAR
TO FACES.
COATING: ANTIREFLECTIVE COAT WITH MgF2 FOR
MAXIMUM TRANSMISSION AT 600nm WITH A
NORMAL INCIDENCE ANGLE, APPLIED TO ONE
FACE ONLY.
MARKING: ARROW ON OD SURFACE POINTING TOWARDS
THE COATED FACE.