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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 7 — Mar. 1, 1999
  • pp: 1224–1230

High-resolution multimodulation Fourier-transform spectroscopy

Nathalie Picqué and Guy Guelachvili  »View Author Affiliations


Applied Optics, Vol. 38, Issue 7, pp. 1224-1230 (1999)
http://dx.doi.org/10.1364/AO.38.001224


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Abstract

High-resolution double-modulation Fourier-transform (FT) spectroscopy (FTS) is demonstrated for what is, to our knowledge, the first time. Two high-resolution FT interferograms are simultaneously recorded. The first one is nonselective and contains all the spectral information from the observed source, and the other one is made of the samples that are sensitive to only a specific source modulation. General formulations and practical recording procedures are given for phase- and intensity-modulated spectra. The advantage of selectivity is illustrated by velocity-modulated emission spectra of the Δv = 1 sequence of the Doppler-shifted ArH+ ion. It is also shown that for a source perturbation of small amplitude, only the product of intensity × shift can be retrieved from the selective line shapes obtained in a phase-modulated laser or FT spectra. Thanks to the multimodulation FTS approach, the intensity and the shift of the transitions are measured in a single experiment.

© 1999 Optical Society of America

OCIS Codes
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6350) Spectroscopy : Spectroscopy, ionization
(300.6380) Spectroscopy : Spectroscopy, modulation

History
Original Manuscript: September 8, 1998
Revised Manuscript: November 30, 1998
Published: March 1, 1999

Citation
Nathalie Picqué and Guy Guelachvili, "High-resolution multimodulation Fourier-transform spectroscopy," Appl. Opt. 38, 1224-1230 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-7-1224

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