A coherent-dispersion spectrometer combining a solid Sagnac interferometer with a dispersing prism is presented, which reduces the multiplex disadvantage of Fourier transform spectroscopy used in the ultraviolet and visible regions while maintains the simultaneous wavelength detection. The spectrometer generates multiple interferograms simultaneously, each with a separate wavelength range and located in a separate row of the detector. The mathematical expressions are given for describing the coherent dispersion, the design calculations are illustrated by an example for the spectral range from 200 nm to 600 nm, and the numerical simulations are shown for the interferogram and spectrum. The unique design of the optics makes the spectrometer very stable, compact, relatively small-sized and, therefore, very suitable for broadband ultraviolet-visible space exploration instruments.
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