DIAMETER: 0.502″+/-.005″
THICKNESS: 0.039″+/-.005″
PARALLELISM: < 30 ARC SECONDS
OD SURFACE: V-SHAPE, 90 DEGREE INCLUDED ANGLE.
SURFACE ACCURACY: 1/4 WAVE MAXIMUM AT 633nm,
BOTH FACES.
SURFACE QUALITY: 40-20 PER MIL-PRF-13830, 2 FACES.
MATERIAL TYPE/QUALITY: SAPPHIRE, OPTICAL GRADE.
CRYSTALLOGRAPHIC ORIENTATION: (0001)
COATING: NONE, UNCOATED SUBSTRATE.