Material
BK7, K9 or Fused Silica or others optical glass
Design Wavelength
visible light
Dimmensions(Square or Circle)
1 to 300mm
Surface Figure
N<3, dN<0.5 @632.8nm
Diameter Tolerance
+0/-0.1 mm
Thickness Tolerance
±0.1 mm
Focal Length
±1%
Centration
<3 arc minutes
Clear Aperture
>90%
Surface Quality
60/40 or 40/20 scratch and dig
Protective Bevel
0.1-0.5 mm x 45°
