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Fourier transform spectrometer based on Fabry-Perot interferometer

Fourier transform spectrometer based on Fabry-Perot interferometer

Applied Optics 55(20): 5322-5331

We analyze the Fourier transform spectrometer based on a symmetric/asymmetric Fabry-Perot interferometer. In this spectrometer, the interferogram is obtained by recording the intensity as a function of the interferometer length. Then, we recover the spectrum by applying the discrete Fourier transform (DFT) directly on the interferogram. This technique results in spectral harmonic overlap and fictitious wavenumber components outside the original spectral range. For this purpose, in this work, we propose a second method to recover the spectrum. This method is based on expanding the DFT of the interferogram and the spectrum by a Haar or box function. By this second method, we recovered the spectrum and got rid of the fictitious spectral components and spectral harmonic overlap.

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Accession: 057896681

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PMID: 27409306

DOI: 10.1364/ao.55.005322

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