Etalon meaning

ātə-lŏn, ĕtə-
The definition of an etalon is an instrument that is used to measure the wavelength of light.

An example of etalon is the equipment used to stabilize the wavelength of a laser.

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A type of interferometer in which incoming light is repeatedly refracted and reflected between two surfaces into multiple beams that are then focused together, causing self-interference of the light.
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An optical instrument with two plane parallel reflecting surfaces, used for the precise measurement of distance or the wavelength of light.
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In optical networking, an etalon is a passive filter that uses a Fabry-Perot cavity. See Fabry-Perot.
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A spectroscopic instrument used to measure and control optical wavelengths. Also known as an interferometer, an etalon comprises two parallel reflecting plane surfaces. Etalons are widely used in lasers. See also Fabry-Perot laser.
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An optical device containing parallel mirrors, used in laser design to delay light.
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Origin of etalon

  • French étalon standard (of weight or a unit of measurement), reference point, etalon (in reference to the fixed widths between the two surfaces in the first such interferometers) from Old French estalon standard, of Germanic origin Middle Dutch stael model, sample

    From American Heritage Dictionary of the English Language, 5th Edition

  • From French étalon (“measuring gauge, standard”).

    From Wiktionary