Specifications:

Material: ZnSe Laser Grade C.V.D. type
Diameter Tolerances: +.000", -.005"
Thickness: ±.010"
Surface Figure: < 1/40 wavelength @ 10.6µ
Centration: < .001"
Focal Length Tolerance: ±1.0%
Surface Quality: < 40/20 scratch-dig Laser Finish

Spectral Performance:

Standard AR Coating type Both Sides @ 10.6µm (AR)

Absorption: < 0.25 % total
Reflectance: < 0.20% per surface @ 10.6µm
Transmittance: > 99.0% typical