日本燃焼学会誌
Online ISSN : 2424-1687
Print ISSN : 1347-1864
ISSN-L : 1347-1864
連載講座―燃焼計測技術の基礎と応用 V
コヒーレント反ストークスラマン分光 (CARS) の基礎と温度測定への応用
秋濱 一弘
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2020 年 62 巻 199 号 p. 40-48

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This paper describes fundamentals of coherent anti-Stokes Raman spectroscopy/scattering (CARS). A brief review of the theoretical background of CARS as one of the third-order nonlinear optical processes. The third-order nonlinear optical susceptibility and the calculation of theoretical spectrum are explained including pressure narrowing phenomenon. The effects of the slit function, the spectral line shape of pump and Stokes lasers are discussed, and the examples of the observed CARS spectra are shown. Temperature measurement and improvement of accuracy are explained. The experimental results of unburned gas temperature in a spark ignition engine are shown as an example of the high accuracy CARS thermometry. The chirped-probe-pulse femtosecond CARS thermometry is introduced as a latest research activity.

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