étalonetalonn.
/eɪtəˈlɒ̃//ɛtəˈlɒ̃//ˈɛtəlɒn/ A device used to produce interfering beams of light, consisting essentially of two plane parallel reflecting plates of fixed separation and (in some kinds) adjustable orientation.
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the world > matter > physics > electromagnetic radiation > light > diffraction > [noun] > instrument employing interference
interferometer1897
Michelson interferometer1897
étalon1905
Fabry-Pérot1908
Mach–Zehnder interferometer1959
1905 E. C. C. Baly Spectrosc. ix. 302 Fabry and Perot, profiting by their experience with their interferometer, have adopted fixed air layers as interference apparatus, the widths of which are determined once and for all. They call these apparatus standards (étalons).
1914 Astrophysical Jrnl. 39 185 Interferometer, echelon grating, parallel interference-plates, etalon, etc.
1934 Discovery July 184/1 The interferometer..is of the type known as the Fabry-Perot étalon, and in this particular form it consists of a metal tube having extremely flat and parallel end surfaces, to which are contacted polished flat plates of glass or natural quartz.
1963 R. W. Ditchburn Light (ed. 2) ix. 358 A determination of the length of the shortest etalon in terms of the wavelength of the cadmium red line.
This entry has not yet been fully updated (first published 1972; most recently modified version published online June 2018).
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n.1905