Observation of coherent anti−Stokes Raman scattering from liquid water

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Abstract
The line shape of the coherent anti−Stokes (CAS) Raman band at 3200 cm−1 in liquid water has been measured using two independent but synchronized pulsed nitrogen laser pumped dye lasers as excitation sources. The observed CAS spectral shape differs significantly from the corresponding classical Stokes Raman profile and can be explained by coherent interference between the resonant and nonresonant scattering. Such effects are important in CAS applications involving aqueous media and in other situations such as high−temperature gases, i.e., T≳1000 °K, where the Raman resonance is significantly broadened.