etalon

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Related to Fabry-Pérot interferometer: Fabry disease

e·ta·lon

 (ā′tə-lŏn′, ĕt′ə-)
n.
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.

[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; akin to Middle Dutch stael, model, sample.]

etalon

(ˈɛtəˌlɒn)
n
(General Physics) physics a device used in spectroscopy to measure wavelengths by interference effects produced by multiple reflections between parallel half-silvered glass or quartz plates
[C20: French étalon a fixed standard of weights and measures, from Old French estalon; see also stallion]
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