Coherence Measurement Using Michelson Interferometer and Fourier Transform Spectroscopy

It is known that in an interferometer the fringe contrast may depend on the coherent property of light sources. For example, in a Michelson interferometer with a source of certain bandwidth, the interference fringe contrast varies with different the optical path difference. By measuring the interferogram contrast at different positions of the movable mirror, the coherence length of the source can be concluded. Typical Fourier-transform spectroscopy is usually based on such type of optical setup.

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