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

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 intern...

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Veröffentlicht in:Applied optics (2004) 2012-12, Vol.51 (34), p.8057-8067
Hauptverfasser: Karagiannopoulos, Solon, Cheadle, Edward, Wright, Paul, Tsekenis, Stylianos, McCann, Hugh
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container_end_page 8067
container_issue 34
container_start_page 8057
container_title Applied optics (2004)
container_volume 51
creator Karagiannopoulos, Solon
Cheadle, Edward
Wright, Paul
Tsekenis, Stylianos
McCann, Hugh
description 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.
doi_str_mv 10.1364/AO.51.008057
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source Alma/SFX Local Collection; Optica Publishing Group Journals
subjects Absorption spectroscopy
Diodes
Imaging
Modulation
Semiconductor optical amplifiers
Temperature compensation
Wavelength multiplexing
Wavelengths
title Multiwavelength diode-laser absorption spectroscopy using external intensity modulation by semiconductor optical amplifiers
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