{wiki}

= Etalon
{synonym}

\Video[https://www.youtube.com/watch?v=HkjlfCiEqGE]
{title=Fabry Perot Interferometer by JFC UCL (2016)}
{description=Description only, reasonable animations. Considers the case of two nearby <beam splitters>.}

\Video[https://www.youtube.com/watch?v=tx67rXzXYD0]
{title=Fabry-Perot Introduction by Williams College Physics (2020)}
{description=
Shows a working device. Confocal <optical cavity>, one of the mirrors scans back and forward moved by a <piezoelectric motor>, this is called a "scanning Fabry-Perot interferometer".

Does not produce an interference pattern, only an on/off blob, which is then fed into an <oscilloscope> for analysis. The oscilloscope shows both the mirror displacement (which is given by a voltage) and the light detector output.
}

\Video[https://www.youtube.com/watch?v=r2ip14zIFmw]
{title=Aligning a Scanning Fabry-Perot Interferometer by University of South Florida (2016)}
{description=Very detailed, and shows of some nice equipment and techniques.}


Fabry-Pérot interferometer