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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
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

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

  Calcite(400-2300nm)

Broadband low power polarizers for visible or near IR wavelengths

Large Acceptance Angle

High Polarization Purity

Low Power Application

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

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

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

BK7/UV Fused Silica

Split the S beam and P beam

Brewster angle of incidence

Suitable for high power apolication

UV Fused Silica

Split the S beam and P beam

45degree Angle of Incidence

Suitable for high power apolication

BK7/SF glass

Split the S beam and P beam

Widely used in most application

Good Extinction Ratio

BK7/UV Fused Silica

Widely used in most application

Optical Path Epoxy Free

High Extinction Ratio

High Damage Threshold

BK7

Working Wavelength 400-700nm

Large size available

Acceptable angle>20deg

Glass

High Extinction Ratio
High Damage Threshold
Large Size Available
Acceptable Angle >20Deg
Resistant to UV Radiation and Chemicals
RoHS Compliant

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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