Specifications:

Material quality
Laser Grade without boundaries and visible inclusions

Range of Sizes
Diameter : 12.7 - 76.2 +0/-0.10 mm
Edge Thickness : 2 - 5 /-0.05 mm

Range of Effective Focal Length (EFL)
12.7-254.0 /- 2 %

Clear Aperture (polished) 90% of diameter

Surface Figure (power-irregularity) at 0.63 microns
Plano: 1 fringe - 0.5 fringe per inch
Radiused : varies dependent upon radius

Surface Quality: Scratch-Dig
80/50, 60/40, 40/20 : per MIL-0-13830

AR Coating Reflectivity at 10.6 microns 0.25%