Fabry-Pérot Interferometer and Rings

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The Fabry–Pérot interferometer is composed of two highly reflective plane mirrors separated by an air layer. The multiple waves interference pattern (rings) is located at infinity and can be observed in the focal plane of a converging lens.


You can vary four parameters: the wavelength of the light source, the reflectance, the air thickness, and the focal length of the converging lens.


Contributed by: Bruno Bousquet (May 2016)
Open content licensed under CC BY-NC-SA



The snapshots show three interference patterns obtained for three sets of wavelength, reflectance, air thickness, and focal length of the imaging lens.

Snapshot 1: 400 nm / 70 / 0.3 mm / 30 cm

Snapshot 2: 550 nm / 90 / 0.2 mm / 30 cm

Snapshot 3: 650 nm / 80 / 0.3 mm / 30 cm

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