CONFIGURATION: DISC, PLANE-PARALLEL
DIAMETER: 0.630″+/-.002″
THICKNESS: 0.160″+/-.002″
PARALLELISM: 3 ARC MINUTES MAXIMUM.
EDGE BEVEL: LIGHT PROTECTIVE BEVEL, 2 PLACES.
FLATNESS: 1/4 WAVE MAXIMUM, 2 FACES.
SURFACE QUALITY: 20-10 PER MIL-O-13830, 2 FACES.
MATERIAL TYPE/QUALITY: SCHOTT BK7 GLASS, GRADE A,
FINE ANNEALED.
COATING: PARTIAL REFLECTIVE COATING FOR
62.0% +/- 2.0% REFLECTANCE WITH A NORMAL
INCIDENCE ANGLE, APPLIED TO 1 FACE.
ANTIREFLECTIVE COATING FOR MAXIMUM
TRANSMISSION WITH A NORMAL INCIDENCE
ANGLE, APPLIED TO OTHER FACE.
MARKING: ARROW ON OD SURFACE POINTING TOWARDS
PARTIAL REFLECTIVE SURFACE.