Relativity and Cosmology


Fabry-Perot Interferometer and Doppler Effect

Authors: Eric Su

The interference pattern of a Fabry-Perot interferometer is conserved in all inertial reference frames. Its constructive pattern requires the wavelength to be proportional to the gap width of the interferometer. The length contraction from Lorentz transformation assumes the gap of the interferometer to be contracted in the direction of the relative motion. The wavelength is also contracted as it is proportional to the gap width. For two observers moving at the same speed, the contracted wavelength appears to be identical. If one of them moves in the opposite direction, they will observe an identical wavelength but two different frequencies due to the Doppler effect. Consequently, they observe two different speeds from the same light.

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[v1] 2019-09-24 14:17:37

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