When working with high power lasers, thin film plate polarisers are one of the best ways of creating a highly polarised output while handling the laser energy. Used at the Brewster angle, even one reflection is highly polarised. However, the film consists of a stack of reflecting surfaces, each of which further polarises the incident radiation.

The reflected beam contains only s-polarised light and the p-polarised component is transmitted. Thin film plate polarisers produce an extinction ratio in excess of 100:1 and they easily handle energy levels of 5 J/cm2 (10ns).

These polarisers are produced on highly polished substrates of UV Fused Silica, BK7, CaF₂, ZnSe or Ge according to the laser wavelength.

They can be circular or rectangular in shape—typical sizes are 25.4 and 50.8 mm diameter or 25, 28, 38 or 50 mm wide rectangles with a length appropriate to the angle of incidence. 

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