Dual wavelength 32-μm source for isotope ratio measurements of ^13CH_4/^12CH_4 | Zendy

Masashi Abe | Zendy; S. Kusanagi | Zendy; Y. Nishida | Zendy; O. Tadanaga | Zendy; Hirokazu Takenouchi | Zendy; Hiroyuki Sasada | Zendy

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Dual wavelength 32-μm source for isotope ratio measurements of ^13CH_4/^12CH_4

Author(s) -

Masashi Abe,

S. Kusanagi,

Y. Nishida,

O. Tadanaga,

Hirokazu Takenouchi,

Hiroyuki Sasada

Publication year - 2015

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.23.021786

Subject(s) - optics , materials science , wavelength , isotope , laser , grating , ridge , physics , geology , paleontology , quantum mechanics

Difference frequency generation using one 1.58-μm and two 1.06-μm distributed feedback Bragg-grating laser diodes and a ridge-type PPLN alternately provide two 3.2-μm coaxial waves resonant with individual isotopic transitions separated by 13 cm(-1). The ν(3) band R(6) A(2) allowed transition of (13)CH(4) and the ν(3) band R(6) A(2) weakly allowed transition of (12)CH(4) are an ideal pair for isotope ratio measurements. The (13)CH(4)/(12)CH(4) isotope ratio is determined for three sample gases with a relative uncertainty of 0.7 ‰, and it is confirmed that the temperature dependence is smaller than the uncertainty.

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