格蘭偏振棱鏡概述

Polarizer	Material	Illustration	Properties 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

	YVO4	Calcite	a-BBO	Quartz
Transparency	500-4000nm	350-2200nm	200-3500nm	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