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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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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