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Principle of path-matched white-light interferometry: (a) set-up with an unbalanced readout interferometer, using a beam splitter BS, and two mirrors M1 and M2; (b) interferogram as a function of the path unbalance ∆Lr, with the secondary peaks yielding a measurement of group birefringence Bg; this interferogram is the Fourier transform (FT) of the channeled spectrum; and the coherence length Lc of the original broadband source is equal to λ 2/∆λFWHM.
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