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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 12 — Jun. 8, 2009
  • pp: 9602–9607

Elimination of residual amplitude modulation in tunable diode laser wavelength modulation spectroscopy using an optical fiber delay line

Arup Lal Chakraborty, Keith Ruxton, Walter Johnstone, Michael Lengden, and Kevin Duffin  »View Author Affiliations


Optics Express, Vol. 17, Issue 12, pp. 9602-9607 (2009)
http://dx.doi.org/10.1364/OE.17.009602


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Abstract

A new fiber-optic technique to eliminate residual amplitude modulation in tunable diode laser wavelength modulation spectroscopy is presented. The modulated laser output is split to pass in parallel through the gas measurement cell and an optical fiber delay line, with the modulation frequency / delay chosen to introduce a relative phase shift of π between them. The two signals are balanced using a variable attenuator and recombined through a fiber coupler. In the absence of gas, the direct laser intensity modulation cancels, thereby eliminating the high background. The presence of gas induces a concentration-dependent imbalance at the coupler’s output from which the absolute absorption profile is directly recovered with high accuracy using 1f detection.

© 2009 OSA

OCIS Codes
(300.6340) Spectroscopy : Spectroscopy, infrared
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(240.6380) Optics at surfaces : Spectroscopy, modulation

ToC Category:
Spectroscopy

History
Original Manuscript: April 7, 2009
Revised Manuscript: May 11, 2009
Manuscript Accepted: May 12, 2009
Published: May 22, 2009

Citation
Arup Lal Chakraborty, Keith Ruxton, Walter Johnstone, Michael Lengden, and Kevin Duffin, "Elimination of residual amplitude modulation in tunable diode laser wavelength modulation spectroscopy using an optical fiber delay line," Opt. Express 17, 9602-9607 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-12-9602


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References

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