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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 34 — Dec. 1, 2012
  • pp: 8057–8067

Multiwavelength diode-laser absorption spectroscopy using external intensity modulation by semiconductor optical amplifiers

Solon Karagiannopoulos, Edward Cheadle, Paul Wright, Stylianos Tsekenis, and Hugh McCann  »View Author Affiliations

Applied Optics, Vol. 51, Issue 34, pp. 8057-8067 (2012)

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A novel opto-electronic scheme for line-of-sight Near-IR gas absorption measurement based on direct absorption spectroscopy (DAS) is reported. A diode-laser-based, multiwavelength system is designed for future application in nonintrusive, high temporal resolution tomographic imaging of H2O in internal combustion engines. DAS is implemented with semiconductor optical amplifiers (SOAs) to enable wavelength multiplexing and to induce external intensity modulation for phase-sensitive detection. Two overtone water transitions in the Near-IR have been selected for ratiometric temperature compensation to enable concentration measurements, and an additional wavelength is used to account for nonabsorbing attenuation. A wavelength scanning approach was used to evaluate the new modulation technique, and showed excellent absorption line recovery. Fixed-wavelength, time-division-multiplexing operation with SOAs has also been demonstrated. To the best of our knowledge this is the first time SOAs have been used for modulation and switching in a spectroscopic application. With appropriate diode laser selection this scheme can be also used for other chemical species absorption measurements.

© 2012 Optical Society of America

OCIS Codes
(250.5980) Optoelectronics : Semiconductor optical amplifiers
(300.1030) Spectroscopy : Absorption

ToC Category:

Original Manuscript: July 30, 2012
Revised Manuscript: October 22, 2012
Manuscript Accepted: October 22, 2012
Published: November 27, 2012

Solon Karagiannopoulos, Edward Cheadle, Paul Wright, Stylianos Tsekenis, and Hugh McCann, "Multiwavelength diode-laser absorption spectroscopy using external intensity modulation by semiconductor optical amplifiers," Appl. Opt. 51, 8057-8067 (2012)

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