CVD ZnSeWindows (Plane Parallel Windows, Plates)

MATERIAL - CVD ZnSe (Zinc Selenide).

CVD ZnSe (Zinc Selenide) optical plane parallel windows are widely used as transfer optics and protective windows.

Crystaltechno Ltd. manufactures different standards optical windows from CVD grown ZnSe material (Chemical Vapor Deposition Zinc Selenide - ZnSe growth polycrystalline material), namely ZnSe windows (ZnSe round and rectangular plates), ZnSe protective windows, ZnSe Brewster windows. Besides, due to using advantages of CVD growth technology we produce Zinc Selenide optical windows with complex shape and profiled mounting grooves according to customer’s requirement. ZnSe windows are used for infrared systems including CO2 laser optics.

We produce optical windows and other optical components from CVD grown ZnSe laser grade material. Basic characteristics of CVD Zinc Selenide laser grade material: grain size (50 - 70) microns, index of absorption 0.0005 (1/cm) at 10.6 microns, transparency in spectral range (0.5 - 20) microns. ZnSe optical windows dimensions - (3 - 100) mm, thickness 20mm. CVD - Zinc Selenide chemical purity - 99.999%.

Crystaltechno Ltd.grows Zinc Selenide (CVD ZnSe) ingots with size up to (270 x 500) mm, thickness up to 35 mm
Crystaltechno Ltd. proposes the best ratio of price/quality for ZnSe windows. Perhaps you will find the required ZnSe windows and another ZnSe optics at our stock, please see item Optical Crystals.

  Surface form tolerances - Flatness   Lambda/2 at 633 nm per inch  
  Surface form tolerances - Irregularity   Lambda/2 at 633 nm  
  Scratch-Dig   80 - 50  
  Size tolerance   +/-0.1 mm  
  Parallelism   less than 5 arc minutes  
  Clear aperture   90 % (80%, if detail size less 20 mm)  
  Bevels   (0.2-0.5) mm x 45 degrees  

For thin ZnSe (Zinc Selenide) windows
Surface form tolerance - without requirements, if ratio of Thickness (T) to Diameter (D) less 1/10.

ZnSe Windows
Diameter, mm
ZnSe Windows
Thickness, mm
Part Number Unit price,
window (laser grade)
  12,7   2   W17-05   price upon request  
  25,4   3   W17-10   price upon request  
  38,1   4   W17-15   price upon request  
  50,8   6   W17-20   price upon request  
  76,2   8   W17-30   price upon request  
  101,6   12   W17-40   price upon request  

All prices are FCA Moscow.

Min quantity volume 10 pcs for diameters 12,7 - 50,8 mm
Min quantity volume 5 pcs for diameters 76.2 - 101.6 mm

Large sizes and another shape of ZnSe CVD windows are also available according to customer’s requirement.

You can see spectral transmittance of ZnSe uncoated polished windows (thickness 10 mm).

Because of high refractive index (n=2.4 at 10.6 microns), Fresnel losses of ZnSe polished surface are equal 17% (at one side), thus the Zinc Selenide (ZnSe) window transmission equals 68.9% at 10.6 micron. If we take into account subsequent multiple internal beam reflections inside of ZnSe plate, then transmission (Tw) of a uncoated ZnSe window Tw = 70.9% (without absorption).

We offer two sides antireflection (AR/AR) coating for ZnSe windows both for one wavelength (10.6 microns or another) and for the IR spectral range (3 - 12) microns. Spectral transmission of AR/AR coated Zinc Selenide window - up to 99%.

Please contact us for ZnSe optical windows pricing of other size, shape and precision requirements. Perhaps you will find required ZnSe windows and other ZnSe optics at our stock, please see item Optical Crystals.


CaF2 (Calcium Fluoride windows)
BaF2 (Barium Fluoride windows)
MgF2 (Magnesium Fluoride windows)
LiF (Lithium Fluoride windows)
Al2O3 (Sapphire windows)
FS (Fused Silica windows)
Quartz windows
BK7 windows
Si (Silicon windows)
Ge (Germanium windows)
ZnSe (Zinc Selenide windows)
ZnS (Zinc Sulphide windows)

Ordering Info
  (c) Crystaltechno Ltd. Vernadskogo 113-106, Moscow 119571, Russia
+7 (495) 234-5951, 234-5952, 956-7610
fax +7 (495) 433-1551
Site suggestions: webmaster@crystaltechno.com