Double-grating Sagnac Fourier Transform Spectrometer

Description Researchers in the University of Hawaii's Free-Electron Laser Group have developed a Fourier transform spectrometer based on a modified Sagnac interferometer. The instrument uses two gratings as dispersive elements to greatly improve the spectral resolution, and in-line optics to match the beam size in the interferometer to optimize the efficiency. A CCD or photodiode array is used as the detector and the fast Fourier transform of the fringe pattern is performed by a computer. Applications Practical applications include remote sensing, process monitoring, and basic research. The fast response time of the detector also makes the spectrometer possible to perform real time spectral analysis. Main Advantages The use of two gratings permits unprecedented spectral resolution by over an order of magnitude compared to the present state of the art. Since no mechanically moving part is used, this spectrometer is compact and easy to align. All other benefits of compact spatial Fourier transform spectrometers are retained, including compact size, rugged construction, single-shot recording with no moving parts, and quick response time.

Type of Offer: Licensing



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