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Browse Journals & Magazines > Applied Physics Letters ...> Volume:89 Issue:22 Help

CH4 monitoring in ambient air by communication band laser diode based difference frequency generation in a quasi-phase-matched LiNbO3 waveguide

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7 Author(s)
Yanagawa, T. ; NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato, Wakamiya, Atsugi, Kanagawa 243-0198, Japan ; Tadanaga, O. ; Magari, K. ; Nishida, Y.
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Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2397565 

Methane in ambient air is detected by difference frequency generation in a direct-bonded quasi-phase-matched LiNbO3 ridge waveguide using near infrared communication band laser diodes as pump and signal sources. Absorption lines for the Q branch in the 3.3 μm ν3 band are measured by using a Hanst configuration multipass cell with a 107 m path length. The authors detect 35 ppb CH4 in 2 kPa ambient air with a single wavelength scan of a signal external cavity laser diode by suppressing various spectroscopic fringes and stabilizing the pump laser diode oscillation mode with a fiber Bragg grating.

Published in:
Applied Physics Letters  (Volume:89 ,  Issue: 22 )

Date of Publication: Nov 2006

Page(s):
221115 - 221115-3
ISSN :
0003-6951
Digital Object Identifier :
10.1063/1.2397565
Date of Current Version :
18 June 2009
Issue Date :
Nov 2006

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