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Abstract

Optical instruments having, inter alia, optics to process wavelengths of electromagnetic radiation to produce an interferogram. The instruments include at least one optical path and optical elements positioned along this path for splitting the electromagnetic radiation and spectrally dispersing the wavelengths to produce first and second sets of spectrally dispersed beams which interfere with each other to produce a plurality of different fringes of different wavelengths. The optics for dispersing the wavelengths includes a matched pair of gratings. The gratings may be reflective or they may be transmissive. The optics also includes a beam splitter and first and second mirrors. The gratings may be positioned in a variety of locations along the optical path. The instruments can also include a detector for detecting the interferogram and means for processing the detected interferogram to produce spectral information.

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