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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 1 — Jan. 4, 2010
  • pp: 267–280

Influence of the wavelength-dependence of fiber couplers on the background signal in wavelength modulation spectroscopy with RAM-nulling

Arup Lal Chakraborty, Keith Ruxton, and Walter Johnstone  »View Author Affiliations

Optics Express, Vol. 18, Issue 1, pp. 267-280 (2010)

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Recently a technique to optically eliminate the background residual amplitude modulation in 1f wavelength modulation spectroscopy was demonstrated, where perfect elimination throughout the scan range was not achieved due to the wavelength-dependence of couplers and that of the laser intensity modulation. This paper theoretically analyzes the technique and experimentally demonstrates that the elimination can be perfect for one of three possible experimental configurations, making this important for potential applications with some recently-developed laser sources. For the other configurations a non-zero background slope is predicted, experimentally verified, and the anomalous nature of signals is thereby explained. A common signal normalization method is devised that is independent of the signal slope, a fact that is important for industrial deployment of such systems.

© 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:

Original Manuscript: November 5, 2009
Revised Manuscript: December 4, 2009
Manuscript Accepted: December 14, 2009
Published: December 23, 2009

Arup Lal Chakraborty, Keith Ruxton, and Walter Johnstone, "Influence of the wavelength-dependence of fiber couplers on the background signal in wavelength modulation spectroscopy with RAM-nulling," Opt. Express 18, 267-280 (2010)

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