Polarizer

Thin Film / Cube / Broadband

Thin Film Polarizer TFP
Normally is coated on a plate (that does not need to have any birefringence) and uses the strong reflection difference between p- and s-polarized light. Working with the Brewster angle a high extinction ratio can be achieved and no AR on the rear surface is required (see tips and tricks).

Cube Polarizer CP
Is built out of two 45° prisms with a polarizing coating on one of the hypotenuses. The prisms are cemented or optically contacted after coating, some with an air gap. The output surfaces need an AR at 0°.

Broadband Polarizer BBPOL
Separates the s- and p-polarized light in a broader range compared to the standard TFP but normally with a lower extinction ratio. It can be made by using a plate coated on both sides and a large angle of incidence (AOI~72°) or a cube (special glass material is required) .

Coating types

TFP
CP
BBPOL

TFP,CP,BBPOL

λ [nm]		AOI	method
157	Rp < 0.3%, Rs > 87%	72° on CaF₂	EBE
193	Tp > 80%, Ts < 10%	73°	EBE
248	Tp > 80%, Ts < 2%	Brewster	EBE
266	Tp > 90%, Ts < 2%	Brewster	EBE
355	Tp > 94%, Ts < 2%	Brewster	EBE
	Tp > 96%, Ts < 0.2%	Brewster	IBS
532	Tp > 96%, Ts < 1%	Brewster	IAD
	Tp > 99%, Ts < 0.1%	Brewster	IBS
808	Tp > 95%, Ts < 1%	Brewster	EBE
940	Tp > 95%, Ts < 1%	Brewster	IAD
1064	Tp > 95%, Ts < 5%	45° cube	EBE
	Tp > 99%, Ts < 1%	45°	IBS
	Tp > 95%, Ts < 2%	Brewster	EBE
	Tp > 99%, Ts < 0.1%	Brewster	IBS
1342	Tp > 96%, Ts < 1%	Brewster	IAD
1550	Tp > 98%, Ts < 1%	45°	IBS
2100	Tp > 95%, Ts < 0.5%	Brewster	IAD

λ [nm]	extinction ratio	AOI	method
1064	Tp/Ts > 990	Brewster	IBS
	Rs/Rp > 200
	Tp/Ts > 48	Brewster	EBE
	Rs/Rp > 20

The extinction ratio can be optimized for use in reflection or transmission. The given values refer to the standard TFP made by IBS and the much cheaper EBE. Also other splitting ratios, e.g. Tp/Rs can be optimized.

All values are given for standard coatings. Customized coatings available for all types.

Coating methods available: