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 NoMaterialDiameterETCoating
ZBW2510ZnSe25mm3mmUncoated ZnSe
ZBW3315ZnSe33mm3mmUncoated ZnSe
EZBW4015ZnSe40mm3mmAR/U-EB
ZBW4218ZnSe42mm3mmUncoated ZnSe
ZBW5018ZnSe50mm3mmUncoated ZnSe
EZBW5018ZnSe50mm3mmAR/U-EB
ZBW5320ZnSe53mm3mmUncoated ZnSe
ZBW6122ZnSe61mm3mmUncoated ZnSe
ZBW6323ZnSe63mm3mmUncoated ZnSe
ZBW6625ZnSe66mm3mmUncoated ZnSe
EZBW6625ZnSe66mm3mmAR/U-EB
ZBW10038ZnSe100mm3mmUncoated ZnSe
ZBW11542ZnSe115mm3mmUncoated ZnSe
ZBW13248ZnSe132mm3mmUncoated ZnSe

Brewster window

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ULO Optics is an ISO certified company and quality is at the heart of everything we do.  With a host of industrial affiliations you can rely on ULO to deliver.