Brewster window is uncoated substrate used in an optical system at Brewster Angle. It is used to separate the S polarization from the P polarization.
Thin Film Polarizer (TFP's) is used to split a laser beam into two parts with S and P Polarizations. Conversely, TFP's can be used to combine two beams with S and P polarizations. TFP's consist of a coated plate, which is oriented at Brewster's angle with respect to the incoming beam. The thin film coating will enhance the reflectivity of the s-polarized component of the beam, while maintaining high transmission of the p-polarized component.

Specifications	Standards
Dimensional Tolerances	Width	+0.000" -0.005"
	Length	+0.000" -0.005"
	Thickness	+0.000" -0.005"
Parallelism	Plano	<= 20 seconds
Clear Aperture (polished)	90% of diameter
Surface Figure at 0.63μm	Width	Power: 1 fringe per inch; Irregularity: 0.5 fringe per inch
	Length	Power: 1 fringe per inch; Irregularity: 0.5  fringe per inch
Scratch-Dig	40/20 or better
Brewster Angle at 10.6μm	ZnSe	67.4o
	Ge	76.0o
TFP coating@10.6μm	Rs ≥ 98%  &  Tp ≥ 97%
Product Category	Description
Brewster Window/TFP	12.65mm×32.92mm×2.03mmThk
Brewster Window/TFP	10.16mm×30.48mm×3.0mmThk
Brewster Window/TFP	10.16mm×26.42mm×2.03mmThk
Brewster Window/TFP	12.7mm×33.0mm×2.03mmThk
Brewster Window/TFP	15.24mm×39.6mm×2.03mmThk
Brewster Window/TFP	17.78mm×46.2mm×2.03mmThk
Brewster Window/TFP	20.32mm×52.8mm×3.0mmThk
Brewster Window/TFP	22.86mm×59.4mm×3.0mmThk
Brewster Window/TFP	25.4mm×66.0mm×3.0mmThk
Brewster Window/TFP	38.1mm×99.3mm×4.06mmThk
Brewster Window/TFP	50.8mm×132.3mm×5.08mmThk
★To Brewster Window and TFP, incident angle is 67.40  ★U-unpolarized light,S-s-polarization,P-p-polarization,NA-no request for this parameter     ★The above are about standard products, they can also be custom made