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Polarizer

MaterialIllustrationProperties and Application
Glan-Taylor
Polarizer		a-BBO(190-3500nm)
Calcite(350-2300nm)
YVO4(500-4000nm)

  • Air-spaced

  • Close to Brewster's Angle Cutting

  • Low L/A=0.8

  • For medium power application

Glan-Laser
Polarizer		a-BBO(190-3500nm)
Calcite(350-2300nm)
YVO4(500-4000nm)		  

  • Air-spaced.

  • Close to Brewster's angle Cutting

  • Mounted with escape window

  • Suitable for high power applications

  • L/A=1.5

Glan-Thompson
Polarizer		a-BBO(220-900nm)
Calcite(350-2300nm)		  

  • Cemented

  • Suitable for low power applications

  • Wide acceptance angle

Wollaston
Polarizer		a-BBO(200-3500nm)
Calcite(350-2300nm)
YVO4(500-4000nm)
Quartz(200-2300nm)		  

  • Cemented

  • Separate ordinary and extraordinary beams at certain angle

  • Suitable for low power application and where the large deviation is required

Rochon
Polarizer		a-BBO(200-3500nm)
YVO4(500-4000nm)
Quartz(200-2300nm)		  

  • a-BBO is used to guarantee a wide transmission range

  • Especially suitable for UV application

  • Split the ordinary and extraordinary ray, but only ordinary beam is deviated

High Transmission Glan Laser Polarizers
YVO4(500-4000nm)
Calcite(350-2300nm)

  • Air Spaced

  • Brewster's Angle Cutting

  • Mounted with escape window

  • Suitable for high power and high transmission application

  • Brewster Angle input

Glan Thompson Polarizing Beamsplitter Cubes       Calcite
(350-2300nm)

  • Cemented

  • Suitable for low power application

  • Wide acceptance angle field

  • Split o-ray&e-ray at 45deg

  • Only o-ray is deviated


Comparison of the four materials



YVO4Calcitea-BBOQuartz
Transparency500-4000nm350-2200nm200-3500nm200-2300nm
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 Hardness534.57
Thermal Expansion Coefficientaa=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 SusceptibilityLowLowLowLow