Nonlinear Raman spectroscopy without tunable laser for sensitive gas detection in the atmosphere

Yuji Oki, Noriyuki Kawada, Yoshiteru Abe, Mitsuo Maeda

研究成果: Contribution to journalArticle査読

16 被引用数 (Scopus)

抄録

A new technique for photo-acoustic Raman spectroscopy (PARS) and coherent anti-Stokes Raman spectroscopy (CARS) is proposed and demonstrated for the detection of H2 and CH4 at atmospheric pressure. Conventionally, these types of nonlinear Raman spectroscopy require two lasers whose frequency difference is tuned to the Raman frequency. In the proposed scheme, only a pulsed Nd: YAG laser is used as a pumping source, and a Raman shifter filled with the same gas to be detected is combined. This allows automatic generation of the Raman-shifted radiation. In the case of CH4, the measurement with the optimized scheme shows that detection limits up to 1 ppm for PARS and 15 ppm for CARS are achieved. The proposed PARS technique allows the measurement of the CH4 concentration in the natural air. Although the sensitivity of CARS is lower than that of PARS, the signal to noise ratio (S/N) for higher concentrations is better.

本文言語英語
ページ(範囲)57-62
ページ数6
ジャーナルOptics Communications
161
1-3
DOI
出版ステータス出版済み - 1 1 1999

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 原子分子物理学および光学
  • 物理化学および理論化学
  • 電子工学および電気工学

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