Abstract
Nonlinear Raman spectroscopy has emerged as a very powerful tool in combustion analysis due to its high spectral resolution, superior signal/noise and sensitive detection capabilities. Of the myriad of nonlinear Raman techniques, coherent anti-Stokes Raman spectroscopy (CARS) and stimulated Raman gain spectroscopy (SRGS) are experiencing the most utilization in measurement and spectroscopic investigations respectively. This paper traces the diagnostic development of nonlinear Raman approaches largely motivated by the limitations of linear Raman scattering. Primary emphasis is focussed on CARS. The paper discusses its diagnostic advantages, summarizes important advances and highlights some of its many practical combustion applications. The paper concludes with a discussion of the recent trend to multi-color CARS for simultaneous multiple species measurements.
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