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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 17 — Jun. 10, 2007
  • pp: 3611–3616

Fourier-transform cavity-enhanced absorption spectroscopy using an incoherent broadband light source

Albert A. Ruth, Johannes Orphal, and Sven E. Fiedler  »View Author Affiliations

Applied Optics, Vol. 46, Issue 17, pp. 3611-3616 (2007)

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A cavity-enhanced absorption setup employing an incoherent broadband light source was used in combination with a Fourier-transform spectrometer to measure the spin-forbidden B-band of gaseous oxygen at 688   nm and several weak absorption transitions of water vapor in the same spectral region at room temperature in ambient air. The experiments demonstrate that the sensitivity of a Fourier-transform spectrometer can be significantly improved by increasing the effective path length, while retaining a rather small sample volume. In comparison with a single-pass absorption measurement, we report a path-length enhancement factor of 200 and an improvement of the signal-to-noise ratio of 6 in the present cavity-enhanced absorption experiment. The practical advantages and limitations of this novel approach are outlined and potential applications are briefly discussed.

© 2007 Optical Society of America

OCIS Codes
(010.1280) Atmospheric and oceanic optics : Atmospheric composition
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.1030) Spectroscopy : Absorption
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(300.6390) Spectroscopy : Spectroscopy, molecular
(350.5730) Other areas of optics : Resolution

ToC Category:

Original Manuscript: November 8, 2006
Revised Manuscript: January 12, 2007
Manuscript Accepted: January 23, 2007
Published: May 18, 2007

Albert A. Ruth, Johannes Orphal, and Sven E. Fiedler, "Fourier-transform cavity-enhanced absorption spectroscopy using an incoherent broadband light source," Appl. Opt. 46, 3611-3616 (2007)

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