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Glan–Thompson prism : ウィキペディア英語版
Glan–Thompson prism

A Glan–Thompson prism is a type of polarizing prism similar to the Nicol and Glan–Foucault prisms. It consists of two right-angled calcite prisms that are cemented together by their long faces. The optical axes of the calcite crystals are parallel and aligned perpendicular to the plane of reflection. Birefringence splits light entering the prism into two rays, experiencing different refractive indices; the ''p''-polarized ordinary ray is totally internally reflected from the calcite-cement interface, leaving the ''s''-polarized extraordinary ray to be transmitted. The prism can therefore be used as a polarizing beam splitter. Traditionally Canada balsam was used as the cement in assembling these prisms, but this has largely been replaced by synthetic polymers.
Compared to the similar Glan–Foucault prism, the Glan–Thompson has a wider acceptance angle, but a much lower limit of maximum irradiance (due to optical damage limitations of the cement layer).
==See also==

*Glan–Taylor prism
*Nicol prism

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Glan–Thompson prism」の詳細全文を読む



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