Reduced-background gas-phase absorption spectroscopy
- Combustion Research Facility, MS 9051, Sandia National Laboratories, Livermore, California 94551-0969 (United States)
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. {copyright} {ital 1998} {ital Optical Society of America}
- OSTI ID:
- 641520
- Journal Information:
- Optics Letters, Vol. 23, Issue 16; Other Information: PBD: Aug 1998
- Country of Publication:
- United States
- Language:
- English
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