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beams. The prism is also shorter (for a given usable aperture) than the Glan–Thompson design, and the deflection angle of the rejected beam can be made close to 90°, which is sometimes useful. Glan–Foucault prisms are not typically used as polarizing beamsplitters because while the transmitted beam
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is similar, except that the crystal axes and transmitted polarization direction are orthogonal to the Glan–Foucault design. This yields higher transmission and better polarization of the reflected light. Calcite Glan–Foucault prisms are now rarely used, having been mostly replaced by Glan–Taylor
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Compared to the Glan–Thompson prism, the Glan–Foucault has a narrower acceptance angle over which it works, but because it uses an air gap rather than cement, much higher
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221:, Deshazer, Larry G., "Yttrium orthovanadate optical polarizer", issued 1975-10-21, assigned to Union Carbide Corp.
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J.-Y. Fan; et al. (2003). "A study on transmitted intensity of disturbance for air-spaced Glan-type polarizing prisms".
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prisms are more expensive, however, and can accept beams over a very limited range of angles of incidence.
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prisms are spaced with an air gap instead of being cemented together.
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Bennett, Jean M. (1995). "Polarizers". In Bass
Michael, Ed. (ed.).
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can be used without damage. The prism can thus be used with
75:-polarized light is transmitted straight through the prism.
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is completely polarized, the reflected beam is not.
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105:polarizers and other more recent designs.
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71:light at the air gap means that only
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27:-polarized light, transmitting the
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197:10.1016/S0030-4018(03)01618-3
138:Handbook of Optics Volume II
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61:Total internal reflection
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219:US patent 3914018
167:Optics Communications
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