Recovery of absolute absorption line shapes in tunable diode laser spectroscopy using external amplitude modulation with balanced detection

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Accurate recovery of an absorption lineshape is important in many industrial applications for simultaneous measurement of gas concentration and pressure or temperature. Here we demonstrate a method, based on a modification to the Hobbs balanced receiver circuit, for background signal nulling when external amplitude modulation of the laser output is used. Compared with direct or non-nulled detection techniques, we demonstrate that the method significantly improves the signal to noise ratio to a level comparable to that of conventional second harmonic wavelength modulation spectroscopy. Most importantly, normalisation and recovery of the lineshape is straightforward and immune to the difficulties that afflict lineshape recovery with conventional wavelength modulation spectroscopy.
LanguageEnglish
Pages675-680
Number of pages6
JournalIEEE Sensors Journal
Volume16
Issue number3
Early online date12 Oct 2015
DOIs
Publication statusPublished - 1 Feb 2016

Fingerprint

Laser spectroscopy
Amplitude modulation
laser spectroscopy
line shape
Semiconductor lasers
recovery
diodes
Recovery
Modulation
Spectroscopy
modulation
Wavelength
laser outputs
wavelengths
spectroscopy
Industrial applications
Signal to noise ratio
signal to noise ratios
receivers
harmonics

Keywords

  • balance detection
  • absorption line shape recovery
  • gas sensors
  • diode laser spectroscopy
  • optical fibers

Cite this

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abstract = "Accurate recovery of an absorption lineshape is important in many industrial applications for simultaneous measurement of gas concentration and pressure or temperature. Here we demonstrate a method, based on a modification to the Hobbs balanced receiver circuit, for background signal nulling when external amplitude modulation of the laser output is used. Compared with direct or non-nulled detection techniques, we demonstrate that the method significantly improves the signal to noise ratio to a level comparable to that of conventional second harmonic wavelength modulation spectroscopy. Most importantly, normalisation and recovery of the lineshape is straightforward and immune to the difficulties that afflict lineshape recovery with conventional wavelength modulation spectroscopy.",
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AU - Lengden, Michael

AU - Stewart, George

AU - Johnstone, Walter

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KW - gas sensors

KW - diode laser spectroscopy

KW - optical fibers

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