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

We Also Offer Special Coatings To Meet Our Customers Needs.
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Ultra Low Absorption AR Coating type Both Sides @ 10.6µm (ULA)

Absorption: < 0.15 % total
Reflectance: < 0.25% per surface
Transmittance: > 99.0% typical

Dual Band AR Coating type Both Sides @ 10.6µm and .633µm (DBAR)

Absorption: < 0.30 % total
Reflectance: < 0.25% per surface @ 10.6µm
Transmittance: > 98.5% @ 10.6µm with > 90% @ .633µm