Thin Film Polarisers for CO₂ Lasers

These polarising plate beamsplitters are intended for use with CO₂ laser beams.   They use the principle of Brewster angle reflection enhanced many times by the use of a multi-layer dielectric film.  The polarising  coating is applied to the reflecting face and an anti-reflection coating for 10.6μm is applied to the rear surface. 

Two different substrates are offered, Zinc Selenide or Germanium.  Each has to be used a the Brewster angle of incidence for complete effectiveness. The Brewster angle for Zinc Selenide is 67.4° and that for Germanium is 76.0°.

In order to accommodate a uniform circular beam at these extreme angles the polarizers are supplied on rectangular substrates.

Standard sizes for ZnSe are: 25.4 x 66.0 mm or 50.8 x 132.2 mm.

Standard sizes for Ge are: 25.4 x 104.9 mm or 38.1 x 157.4 mm.

Thickness varies is either 3 or 5 mm in order to control the flatness specification.  

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