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Title: A Sagnac Fourier spectrometer

A spectrometer based on a Sagnac interferometer, where one of the mirrors is replaced by a transmission grating, is introduced. Since the action of a transmission grating is reversible, both directions experience the same diffraction at a given wavelength. At the output, the crossed wavefronts are imaged onto a camera, where their Fizeau fringe pattern is recorded. Each spectral element produces a unique spatial frequency, hence the Fourier transform of the recorded interferogram contains the spectrum. Since the grating is tuned to place zero spatial frequency at a selected wavelength, the adjoining spectrum is heterodyned with respect to this wavelength. This spectrum can then be discriminated at a high spectral resolution from relatively low spatial frequencies. The spectrometer can be designed without moving parts for a relatively narrow spectral range or with a rotatable grating. As a result, the latter version bears the potential to be calibrated without a calibrated light source.
Authors:
 [1] ;  [2]
  1. Lenzner Research LLC, Tucson, AZ (United States)
  2. Univ. of New Mexico, Albuquerque, NM (United States)
Publication Date:
Grant/Contract Number:
SC0011446
Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 25; Journal Issue: 8; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
Univ. of New Mexico, Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Fourier transform spectroscopy; heterodyne; spectroscopy
OSTI Identifier:
1351625

Lenzner, Matthias, and Diels, Jean -Claude. A Sagnac Fourier spectrometer. United States: N. p., Web. doi:10.1364/OE.25.00A447.
Lenzner, Matthias, & Diels, Jean -Claude. A Sagnac Fourier spectrometer. United States. doi:10.1364/OE.25.00A447.
Lenzner, Matthias, and Diels, Jean -Claude. 2017. "A Sagnac Fourier spectrometer". United States. doi:10.1364/OE.25.00A447. https://www.osti.gov/servlets/purl/1351625.
@article{osti_1351625,
title = {A Sagnac Fourier spectrometer},
author = {Lenzner, Matthias and Diels, Jean -Claude},
abstractNote = {A spectrometer based on a Sagnac interferometer, where one of the mirrors is replaced by a transmission grating, is introduced. Since the action of a transmission grating is reversible, both directions experience the same diffraction at a given wavelength. At the output, the crossed wavefronts are imaged onto a camera, where their Fizeau fringe pattern is recorded. Each spectral element produces a unique spatial frequency, hence the Fourier transform of the recorded interferogram contains the spectrum. Since the grating is tuned to place zero spatial frequency at a selected wavelength, the adjoining spectrum is heterodyned with respect to this wavelength. This spectrum can then be discriminated at a high spectral resolution from relatively low spatial frequencies. The spectrometer can be designed without moving parts for a relatively narrow spectral range or with a rotatable grating. As a result, the latter version bears the potential to be calibrated without a calibrated light source.},
doi = {10.1364/OE.25.00A447},
journal = {Optics Express},
number = 8,
volume = 25,
place = {United States},
year = {2017},
month = {3}
}