Optical cavity

Contributor: Stas Fainer

This is a simulation of optical rays inside an optical cavity. In general, given the length of the optical cavity is \(d\), and the focal length of its ideal mirrors is \(f\), the optical cavity is stable (meaning that for each ray that emanates from one of the mirrors towards the other mirror, a non-divergent trajectory is guaranteed for sufficiently high mirrors) in the paraxial approximation, if and only if \(d\leq 4f\).

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Optical cavity