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Abstract

We propose a high-resolution, wide-bandwidth, high-optical-throughput spectroscopic system, in which a Fabry–Perot interferometer (FPI) is used in tandem with a second spectrometer. As the second spectrometer, one of the following three instruments can be used: (1) a grating dispersion-type monochromator attached to a multichannel detector (MCD), (2) a conventional Fourier transform spectrometer (FTS), or (3) a multichannel FTS (MFTS). The principle of operation for the three systems is the same. First, we adjust the free spectral range (FSR) of the FPI to be k (>1) times the data interval DI (or resolved wavenumber) of the second spectrometer. The FSR is divided by N (>k) equally, and the etalon plate spacing of the FPI is changed N times with a step interval of FSR/N in wavenumber. Thereby we gather a total of N spectra from the second spectrometer. Finally, a single high-resolution spectrum is synthesized from the N spectra. To demonstrate the real capabilities of the proposed systems, we present computer simulation results.

Keywords

Instrumentation Spectroscopic techniques High spectral resolution spectroscopy Fabry–Perot interferometer Multichannel spectroscopy Fourier transform spectroscopy Multichannel Fourier transform spectroscopy

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Proposal for High-Resolution,Wide-Bandwidth,High-Optical-Throughput Spectroscopic System Using a Fabry—Perot Interferometer

Abstract

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References