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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 23, Iss. 16 — Aug. 15, 1998
  • pp: 1289–1291

Reduced-background gas-phase absorption spectroscopy

John N. Sweetser and Rick Trebino  »View Author Affiliations


Optics Letters, Vol. 23, Issue 16, pp. 1289-1291 (1998)
http://dx.doi.org/10.1364/OL.23.001289


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Abstract

We propose and demonstrate a new method for single-shot multiplex absorption spectroscopy that permits enhanced sensitivity in the simultaneous measurement of multiple spectral lines in rapidly changing gas-phase media, such as turbulent flames. It uses an ultrashort laser pulse that propagates through the absorbing medium, for which the relevant absorption information resides in the free-induction decay that is trailing behind the transmitted pulse. Time gating out most of the transmitted pulse, but not the free-induction decay, enhances the relative fraction of light that contains absorption information when the spectrum is measured. This procedure reduces the background associated with the input light, thus enhancing detection sensitivity.

© 1998 Optical Society of America

OCIS Codes
(300.1030) Spectroscopy : Absorption
(320.7100) Ultrafast optics : Ultrafast measurements
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(320.7120) Ultrafast optics : Ultrafast phenomena
(320.7160) Ultrafast optics : Ultrafast technology

Citation
John N. Sweetser and Rick Trebino, "Reduced-background gas-phase absorption spectroscopy," Opt. Lett. 23, 1289-1291 (1998)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-23-16-1289


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