noun etalon A device consisting of two reflecting plates for producing interfering light beams. 1
noun etalon An optical device containing parallel mirrors, used in laser design to delay light. 0
noun etalon a device used in spectroscopy to measure wavelengths by interference effects produced by multiple reflections between parallel half-silvered glass or quartz plates 0
noun etalon an optical instrument with two plane parallel reflecting surfaces, used for the precise measurement of distance or the wavelength of light 0
