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A dichroic has selective absorption of one polarisation state, transmitting the other. Available in lower cost polymers and higher precision glass. Suitable for lower power (~W's), larger aperture applications
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A reflective polariser transmits the desired polarisation and reflects the rest. Available as plates, cubes or prisms. Suitable for higher damage thresholds (>50kW), larger acceptance angle (±22.5°)
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Thin-film polarisers in plate or cube form, utilising a multilayer dielectric coating which works on interference effects. The majority of designs are such that the incidence angle is 45°, such that the transmitted and reflected beams. These optics are ideal for high transmission, low loss and specific laser lines or narrow bands.
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Birefringent polarisers transmits the desired polarisation and scatters/deviate's the rest. This utilises the fundamental property of birefringence, where the refractive index depends on its polarisation.
Commonly in the form of joined prisms this type of polariser offers higher extinction ratios, higher damage thresholds, broad wavelength ranges but are more expensive.
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