Brewster Windows 2017-10-18T14:23:39+00:00

Brewster Windows

Brewster windows operate at an angle of incidence equal to the ‘Brewster angle’ which is 67.4 degrees for ZnSe at 10.6mm. In order to present a square profile to the incident beam, they are about 2.5 times longer than their width. They fully transmit linearly polarized light in the P-plane and reflect about 50% of the S-plane component. Consequently, they can be used to enhance (‘clean-up’) the polarization or by rotating it about the beam axis, they can be used as an attenuator. Coated versions enhance the reflectance of the S-component but at the expense of restricting the power. Usually, Brewster windows are used in pairs.

  • Wedged to between 3 and 5 arcminutes in order to overcome multiple interference
  • Coated or uncoated versions and many sizes available
  • Also available in matched wedge pairs

The following Brewster windows are currently available.  Others may be available upon request.


Part No Material Diameter ET Coating
ZBW2510 ZnSe 25mm 3mm Uncoated ZnSe
ZBW3315 ZnSe 33mm 3mm Uncoated ZnSe
EZBW4015 ZnSe 40mm 3mm AR/U-EB
ZBW4218 ZnSe 42mm 3mm Uncoated ZnSe
ZBW5018 ZnSe 50mm 3mm Uncoated ZnSe
EZBW5018 ZnSe 50mm 3mm AR/U-EB
ZBW5320 ZnSe 53mm 3mm Uncoated ZnSe
ZBW6122 ZnSe 61mm 3mm Uncoated ZnSe
ZBW6323 ZnSe 63mm 3mm Uncoated ZnSe
ZBW6625 ZnSe 66mm 3mm Uncoated ZnSe
EZBW6625 ZnSe 66mm 3mm AR/U-EB
ZBW10038 ZnSe 100mm 3mm Uncoated ZnSe
ZBW11542 ZnSe 115mm 3mm Uncoated ZnSe
ZBW13248 ZnSe 132mm 3mm Uncoated ZnSe

Brewster window

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