Material : ZnSe
Design Wavelength: 1.06 um
Design Index: n=2.438
Surface Quality:  40-20 scratch and dig
Paraxial Focal Length: <0.5%
Diameter Tolerance:  +0.0, -0.2mm
Cental Thickness Tolerance: ±0.2mm
Centration:  <=2 arc minutes
Clear Aperture : > 80%
Bevel:  0.25 mmX45°
Coating: AR coating @ 1.06um R<=0.25% 0 deg