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In optics, a Littrow prism is a retro-reflecting dispersing prism arranged in such a way that an incident light beam which enters at the Brewster angle undergoes minimal deviation and hence maximum dispersion.〔 〕 Littrow prisms are typically 30° - 60° - 90° prisms,〔 〕 with a reflective film coating on the surface opposite the 60° angle.〔 〕 Typically Littrow prisms are used in lasings at the end of an optical cavity to offer fine adjustment of the laser's output frequency by altering the angle of incidence. Before the ready availability of diffraction gratings Littrow prisms were used in spectroscopy. == References == 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「Littrow prism」の詳細全文を読む スポンサード リンク
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