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Use of rotational sideband absorption for high sensitivity methane detection with a 1.64 mu m DFB laser

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3 Author(s)
Weldon, V. ; Dept. of Phys., Trinity Coll., Dublin, Ireland ; Phelan, P. ; Hegarty, J.

High sensitivity methane detection using a 1.64 mu m DFB laser in the rotational sideband of the 2v3 overtone region is demonstrated. A sensitivity of 2 ppm.m was achieved which is comparable with recent measurements in the purely vibrational Q branch and therefore relaxes the wavelength constraints of DFB lasers for methane sensing.

Published in:

Electronics Letters  (Volume:28 ,  Issue: 22 )

Date of Publication:

22 Oct. 1992

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