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http://dx.doi.org/10.3807/COPP.2022.6.3.244

Spectral Reconstruction for High Spectral Resolution in a Static Modulated Fourier-transform Spectrometer  

Cho, Ju Yong (Department of Aeronautic Electricity, Hanseo University)
Lee, Seunghoon (Satellite Research Directorate, Korea Aerospace Research Institute)
Kim, Hyoungjin (Department of Aeronautic Electricity, Hanseo University)
Jang, Won Kweon (Department of Aeronautic Electricity, Hanseo University)
Publication Information
Current Optics and Photonics / v.6, no.3, 2022 , pp. 244-251 More about this Journal
Abstract
We introduce a spectral reconstruction method to enhance the spectral resolution in a static modulated Fourier-transform spectrometer. The optical-path difference and the interferogram in the focal plane, as well as the relationship of the interferogram and the spectrum, are discussed. Additionally, for better spectral reconstruction, applications of phase-error correction and apodization are considered. As a result, the transfer function of the spectrometer is calculated, and then the spectrum is reconstructed based on the relationship between the transfer function and the interferogram. The spectrometer comprises a modified Sagnac interferometer. The spectral reconstruction is conducted with a source with central wave number of 6,451 cm-1 and spectral width of 337 cm-1. In a conventional Fourier-transform method the best spectral resolution is 27 cm-1, but by means of the spectral reconstruction method the spectral resolution improved to 8.7 cm-1, without changing the interferometric structure. Compared to a conventional Fourier-transform method, the spectral width in the reconstructed spectrum is narrower by 20 cm-1, and closer to the reference spectrum. The proposed method allows high performance for static modulated Fourier-transform spectrometers.
Keywords
Interferometer; Reconstruction; Spectrometry; Static modulation;
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