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Published online by Cambridge University Press: 12 December 2024
Coherent anti-Stokes Raman scattering (CARS) spectroscopy is a technique that has been widely applied for temperature measurements in combustion and for microscopic imaging of cell structures. CARS spectroscopy is discussed in detail in this chapter as an example of a nonlinear optical technique. The concept of the nonlinear susceptibility is introduced, and the derivation of the susceptibility tensor appropriate for CARS spectroscopy is described in detail. A key aspect of this derivation is the incorporation of the electric dipole transition matrix elements for the Raman scattering process into the susceptibility tensor. CARS spectral modeling and collisional narrowing of CARS spectral features are discussed in detail. The emerging field of femtosecond CARS is discussed. The chapter concludes with detailed examples of CARS intensity calculations.
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