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

Chakraborty, Arup Lal and Ruxton, Keith C. and Johnstone, W. (2010) Suppression of intensity modulation contributions to signals in second harmonic wavelength modulation spectroscopy. Optics Letters, 35 (14). pp. 2400-2402. ISSN 0146-9592

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Abstract

Recovery of the full 2f wavelength modulation spectroscopy (WMS) signal in isolation from the 2f residual amplitude modulation (RAM) due to nonlinear intensity modulation (IM) and distortion due to linear IM is demonstrated. The 2f 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 2f RAM in high-modulation-index calibration-free 2f WMS. It is also important for widely tunable 2f WMS using nontelecom diode lasers with highly nonlinear characteristics leading to high-2f RAM levels.

Item type: Article
ID code: 25887
Keywords: spectroscopy, diode lasers, optical sensing, sensors, optics, Electrical engineering. Electronics Nuclear engineering, Atomic and Molecular Physics, and Optics
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Related URLs:
Depositing user: Miss Rachel Foster
Date Deposited: 13 Jul 2010 11:45
Last modified: 27 Mar 2014 09:07
URI: http://strathprints.strath.ac.uk/id/eprint/25887

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