A Lyot filter is an optical device used in spectroscopy and imaging that employs polarization and interference to selectively transmit specific wavelengths of light while blocking others. It is named after the French physicist A.A. Lyot, who developed the technique. The basic principle behind a Lyot filter involves the use of multiple optical elements, including polarizers and birefringent crystals. These components work together to create interference effects, which enhance the transmission of certain wavelengths and suppress others.
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