1. 
   fabry-perot interferometer
   <apparatus, physics> A type of interferometer with two parallel mirrors (with a variable separation of a few centimetres) arranged so that incoming light is reflected between them multiple times before ultimately being transmitted. ... Useful in spectroscopy because it gives very good frequenc...
   Found op http://www.mondofacto.com/facts/dictionary?fabry-perot+interferometer
   
   
2. 
   Fabry-Pérot interferometer
   (from the article `optical interferometer`) The Fabry-Pérot interferometer (variable-gap interferometer) was produced in 1897 by the French physicists Charles Fabry and Alfred Pérot. It ... The Fabry-Pérot interferometer consists of two reflecting mirrors that can be either curved or flat. Only c...
   Found op http://www.britannica.com/eb/a-z/f/1
   
   
3. 
   Fabry-Pérot interferometer
   A type of optical interferometer that, when placed in front of the diffraction grating in a spectrograph, can reveal fine details in the spectrum of a galaxy, nebula, or other extended object that are beyond the scope of a grating alone. Light from an object is passed through an etalon – a pai...
   Found op http://www.daviddarling.info/encyclopedia/F/Fabry-Perot_interferometer.html
   
   
4. 
   Fabry–Pérot interferometer
   In optics, a Fabry–Pérot interferometer or etalon is typically made of a transparent plate with two reflecting surfaces, or two parallel highly reflecting mirrors. (Technically the former is an etalon and the latter is an interferometer, but the terminology is often used inconsistently.) Its tra...
   Found op http://en.wikipedia.org/wiki/Fabry–Pérot_interferometer
   
   

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