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Rochon polarizer is one of the earliest designs which is made of two birefringent material prisms cemented together. Both ordinary and extraordinary beams propagate collinearly down the optic axis in the first prism under the ordinary refractive index. Upon entering the second prism the ordinary beam experiences the same refractive index and continues undeviated. The extra-ordinary beam however now has a lower refractive index and is refracted at the interface. The angle of refraction is further increased at the birefringent material/air exit surface. Any separation angle can be designed for specific wavelength upon the requirement.
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Wollaston polarizer is made of two birefringent material prisms that are cemented together. The deviations of the ordinary and extraordinary beams are nearly symmetrical about the input beam axis so that the Wollaston polarizing beam splitter has approximately twice the deviation of the Rochon. The separation angle exhibits chromatic dispersion as shown in the blow. Any separation angle can be designed upon the requirement
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Glan Thompson Polarizer Beamsplitter Cube is made of two calcite prisms cemented together. It have been arranged to permit ther output of the s-polarized beam at 45 ° from the straight through p-polarized beam. They provide high polarization purity and high transmission in the two emerging beams. These are useful if it is required to utilize both linear polarization states . They are mounted in a rectangular metal cell and surrounded with an absorbing compound.
Features:
●Widest Field Angle
●Cemented Suitable for low power application
●High Polarization Purity
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Glan Laser prism polarizer is made of two same birefringent material prisms that are assembled with an air space. The polarizer is a modification of the Glan Taylor type and is designed to have less reflection loss at the prism junction. The polarizer with two escape windows allow the rejected beam to escape out of the polarizer which makes it more desirable for high energy lasers. The surface quality of these faces is relatively poor as compared to that of entrance and exit faces. No scratch dig surface quality specifications are assigned to these faces.
Feature：
●Air-spaced
●Close to Brewster's Angle Cutting
●High Polarization Purity
●Short Length
●Wide Wavelength Range
●Suitable for medium power application
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Glan Taylor polarizer is made of two birefringent prisms that are assembled with an aire space. The polarizer with no side escape windows is suitable for low to medium power application where the side rejected beams are not required.
Feature：
●Air-spaced
●Close to Brewster's Angle Cutting
●High Polarization Purity
●Short Length
●Wide Wavelength Range
●Suitable for low to medium power application
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Waveplates also known as Retarders are used to transmit light while modifying its polarization state without attenuating deviating or displacing the beam. Common Waveplate applications include rotating linear polarization or transforming linear polarization into circular polarization. Retarders are designed to operate with light that have existing polarization states. Using a Waveplate with unpolarized light will not have any impact on its polarization state and the light will remain unpolarized. Waveplates consist of birefringent crystalline or polymer materials that create a phase shift between the polarization components.
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