Abstract

A white-light source, a two-wave interferometer and a spectrometer are associated in order to analyze the dispersion (refractive index as a function of wavelength) of a prismatic sample. This set-up behaves like a multi-channelled device: simultaneous monochromatic interferograms are stored in a single bi-dimensional interferogram in the hybrid spatial–spectral domain. Real-time, direct determination of refractive index at every resolved wavelength is provided with high precision (up to 10 −6).

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