Brewster Polarizer-Polarizer-Union Optic

Brewster Polarizer

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★ Brewster angle incidence at all surfaces yields greater than 98% transmission efficiency
★ Rejected beams available for beam splitting/beam combining applications or safe dumping
★ No anti-reflection coatings needed, so can be used in high power conditions
★ RoHS Compliant

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Union Optic provides the following polarizers with four materials include a-BBO, Calcite, Quartz and YVO4 for widest spectrum and high polarization application.

Polarizer	Material	Illustration	Properties and Application
Glan-Taylor Polarizer	a-BBO(220-3000nm) Calcite(350-2300nm) YVO4(500-4000nm)		★ Air-spaced, medium power polarizere for visible or near IR wavelengths ★ Rejected beam absorbed internally,<5x10^-6 extinction ratio ★ Close to Brewster's Angle Cutting ★ High Polarization Purity ★ Short Length
Glan-Laser Polarizer	a-BBO(220-3000nm) Calcite(350-2300nm) YVO4(500-4000nm)		★ Broadband high power polarizers for visible or near IR wavelengths ★ Air-spaced ★ Close to Brewster's Angle Cutting ★ High Polarization Purity ★ Short Length ★ Double escape windows for intracavity use
Glan-Thompson Polarizer	Calcite(400-2300nm)		★ Broadband low power polarizers for visible or near IR wavelengths ★ Large Acceptance Angle ★ High Polarization Purity ★ Low Power Application
Brewster Polarizer	Calcite(350-2300nm) YVO4(500-4000nm)		★ Brewster angle incidence at all surfaces yields Tp>98% ★ Rejected beams available for beam splitting/beam combining applications or safe dumping ★ No anti-reflection coatings needed, so can be used in high power conditions
Wollaston Polarizer	Calcite(400-2300nm) YVO4(500-4000nm) Quartz(400-2300nm)		★ Cemented ★ Separate ordinary and extraordinary beams at certain angle ★ Suitable for low power application and where the large deviation is required
Rochon Polarizer	YVO4(500-4000nm) Quartz(400-2300nm)		★ Wide Wavelength Range ★ High Extinction Ratio ★ Large Field Angle ★ Cemented, Suitable for low power application ★ Split the ordinary and extraordinary ray, but only ordinary beam is deviated
56Deg Polarization Beamsplitter Plate	BK7/UV Fused Silica		★ Split the S beam and P beam ★ Brewster angle of incidence ★ Suitable for high power apolication
45Deg Polarization Beamsplitter Plate	UV Fused Silica		★ Split the S beam and P beam ★ 45degree Angle of Incidence ★ Suitable for high power apolication
Polarization Beamsplitter Cube	BK7/SF glass		★ Split the S beam and P beam ★ Widely used in most application ★ Good Extinction Ratio
High Power Polarization Beamsplitter Cube	BK7/UV Fused Silica		★ Widely used in most application ★ Optical Path Epoxy Free ★ High Extinction Ratio ★ High Damage Threshold
Dichroic Sheet Polarizer	BK7		★ Working Wavelength 400-700nm ★ Large size available ★ Acceptable angle>20deg
Nanoparticle Linear Polarizer	Glass		★ High Extinction Ratio ★ High Damage Threshold ★ Large Size Available ★ Acceptable Angle >20Deg ★ Resistant to UV Radiation and Chemicals ★ RoHS Compliant
Polarization Beam Displacer/Combiner	a-BBO(220-3000nm) Calcite(350-2300nm) YVO4(500-4000nm)		★ Working Wavelength 350-4000nm ★ Orthogonally Polarized Outputs, Outputs Parallel to Input ★ High Extinction Ratio (>10⁵)

Comparison of the four materials

	YVO4	Calcite	a-BBO	Quartz
Transparency	500-4000nm	350-2300nm	220-3000nm	200-2300nm
Crystal Class (Uniaxial)	Positive no=na=nb,ne=nc	Negative no=na=nb,ne=nc	Negative no=na=nb,ne=nc	Positive no=na=nb,ne=nc
Mohs Hardness	5	3	4.5	7
Thermal Expansion Coefficient	aa=4.43x10^-6/K ac=11.37x10^-6/K	aa=24.39x10^-6/K ac=5.68x10^-6/K	aa=4x10^-6/K ac=36x10^-6/K	aa=6.2x10^-6/K ac=10.7x10^-6/K
Hygroscopic Susceptibility	Low	Low	Low	Low

Note:

Classic Glan Laser type prisms (PGT, PGM, and PGL Series) suffer a small, unavoidable loss at the two internal calcite-air interfaces. This loss is avoided in the Brewster type (PBI Series) by presenting the P polarized transmitted beam to these interfaces at Brewster's angle. The result is a high power, low loss polarizer that does not need AR coating.

The user should be aware of two important considerations in the use of Brewster Polarizer (PBI polarizers). First, stringent angular acceptance requirements dictate use with collimated beams only. Second, the transmitted beam has a relatively large parallel beam displacement with respect to the incident beam.

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Material	Calcite, YVO4
Wavelength Range	Calcite: 350-2300nm, YVO4: 500-4000nm
Extinction Ratio	<5x10^-5
Surface Quality	20/10 scratch and dig
Wavefront Distortion	λ/4@632.8nm
Beam Deviation	<3 arc minutes
Damage Threshold	>1000MW/cm²
Coating	No Coating, Tp>98%@1064nm Typical
Mount	Black Anodized Aluminium

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