- 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.
Origin of etalonFrench 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; akin to Middle Dutch stael, model, sample.
- An optical device containing parallel mirrors, used in laser design to delay light.
From French étalon (“measuring gauge, standard”).
etalon - Computer Definition
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.