Working together, the French physicists Charles Fabry and Alfred Perot constructed an optical resonator for use as an interferometer. Now known as the Fabry–Perot etalon, it is used extensively in lasers.
An optical resonator is the optical counterpart of an electronic resonant circuit. It confines and stores light at resonance frequencies determined by its configuration. It is conveniently viewed as an optical transmission system that incorporates feedback: light is repeatedly reflected, or circulates, within its boundaries. Various optical-resonator ...
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