Dual wavelength 3.2-μm source for isotope ratio measurements of 13CH4/12CH4

Masashi Abe, Satomi Kusanagi, Yoshiki Nishida, Osamu Tadanaga, Hirokazu Takenouchi, Hiroyuki Sasada

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Difference frequency generation using one 1.58-μm and two 1.06-μm distributed feedback Bragg-grating laser diodes and a ridgetype PPLN alternately provide two 3.2-μm coaxial waves resonant with individual isotopic transitions separated by 13 cm-1. The ν3 band R(6) A2 allowed transition of 13CH4 and the ν3 band R(6) A2 weakly allowed transition of 12CH4 are an ideal pair for isotope ratio measurements. The 13CH4/12CH4 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.

Original languageEnglish
Pages (from-to)21786-21797
Number of pages12
JournalOptics Express
Issue number17
Publication statusPublished - 2015 Aug 24

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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