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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 35, Iss. 14 — Jul. 15, 2010
  • pp: 2400–2402

Suppression of intensity modulation contributions to signals in second harmonic wavelength modulation spectroscopy

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


Optics Letters, Vol. 35, Issue 14, pp. 2400-2402 (2010)
http://dx.doi.org/10.1364/OL.35.002400


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Abstract

Recovery of the full 2 f wavelength modulation spectroscopy (WMS) signal in isolation from the 2 f residual amplitude modulation (RAM) due to nonlinear intensity modulation (IM) and distortion due to linear IM is demonstrated. The 2 f RAM is eliminated using a fiber delay line, while the linear IM-induced distortion is eliminated by a phasor decomposition approach. This generic and robust two-pronged strategy removes the need to separately measure the 2 f RAM in high-modulation-index calibration-free 2 f WMS. It is also important for widely tunable 2 f WMS using nontelecom diode lasers with highly nonlinear characteristics leading to high- 2 f RAM levels.

© 2010 Optical Society of America

OCIS Codes
(280.1740) Remote sensing and sensors : Combustion diagnostics
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6380) Spectroscopy : Spectroscopy, modulation
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Spectroscopy

History
Original Manuscript: April 30, 2010
Revised Manuscript: June 22, 2010
Manuscript Accepted: June 23, 2010
Published: July 8, 2010

Citation
Arup Lal Chakraborty, Keith Ruxton, and Walter Johnstone, "Suppression of intensity modulation contributions to signals in second harmonic wavelength modulation spectroscopy," Opt. Lett. 35, 2400-2402 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-14-2400


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