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Sensors 2010, 10(7), 6612-6622; doi:10.3390/s100706612
Article

An Efficient and Compact Difference-Frequency-Generation Spectrometer and Its Application to 12CH3D/12CH4 Isotope Ratio Measurements

1,2,* , 2,3
,
2,3
 and
1,2
1 Department of Environmental Science and Technology, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology/4259, Nagatsuta-cho, Midori-ku, Yokohama, 226-8502, Japan 2 SENTAN, Japan Science and Technology Agency/Sanbancho 5, Chiyoda-ku, Tokyo 102-0075, Japan 3 Department of Physics, Faculty of Science and Technology, Keio University/3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
* Author to whom correspondence should be addressed.
Received: 4 February 2010 / Revised: 28 April 2010 / Accepted: 7 June 2010 / Published: 9 July 2010
(This article belongs to the Special Issue Laser Spectroscopy and Sensing)
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Abstract

We have developed an efficient and compact 3.4 μm difference-frequency-generation spectrometer using a 1.55 μm distributed feedback (DFB) laser diode, a 1.06 μm DFB laser diode, and a ridge-waveguide periodically poled lithium niobate. It is continuously tunable in the 30 cm–1 span and is applied to 12CH3D/12CH4 isotope ratio measurements. The suitable pair of 12CH3D n4 pP(7,6) and 12CH4 ν24 R(6) F1(1) lines enabled us to determine their isotope ratio with a precision repeatability of 0.8‰ using a sample and a working standard of pure methane with an effective signal averaging time of 100 ms.
Keywords: isotope ratio; methane; laser spectroscopy; difference frequency generation; waveguide PPLN isotope ratio; methane; laser spectroscopy; difference frequency generation; waveguide PPLN
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Tsuji, K.; Teshima, H.; Sasada, H.; Yoshida, N. An Efficient and Compact Difference-Frequency-Generation Spectrometer and Its Application to 12CH3D/12CH4 Isotope Ratio Measurements. Sensors 2010, 10, 6612-6622.

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