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Applied Optics

Applied Optics


  • Vol. 39, Iss. 22 — Aug. 1, 2000
  • pp: 3984–3990

High-information time-resolved Fourier transform spectroscopy at work

Nathalie Picqué and Guy Guelachvili  »View Author Affiliations

Applied Optics, Vol. 39, Issue 22, pp. 3984-3990 (2000)

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The first instrumental setup, to our knowledge, that is capable of recording in a few hours the time-resolved Fourier transform (TRFT) interferograms of gas-phase spectra that cover several thousands of inverse centimeters with spectral- and time-resolution limits that are equal, at best, to 2.5 × 10-3 cm-1 and 2 ns, respectively, is reported. It was developed on the stepping-mode Connes-type interferometer of the Laboratoire de Photophysique Moléculaire Université de Paris Sud. Also, for the first time, to our knowledge, these high-resolution TRFT spectra, illustrated with the Doppler-limited emission spectra of the N2 transitions (BA) and (B′–B) between 5500 and 11 000 cm-1 and of the atomic Ar lines between 1800 and 4000 cm-1, are recorded in the infrared spectral range. To obtain identical results that have the same signal-to-noise ratio, we should have increased the recording time of our unique previous high-information TRFT spectra by approximately 50,000. In other words, one hour is now long enough to obtain what would previously have required six years to record.

© 2000 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(300.6500) Spectroscopy : Spectroscopy, time-resolved

Original Manuscript: December 13, 1999
Revised Manuscript: February 17, 2000
Published: August 1, 2000

Nathalie Picqué and Guy Guelachvili, "High-information time-resolved Fourier transform spectroscopy at work," Appl. Opt. 39, 3984-3990 (2000)

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