Heterodyne coherent anti-Stokes Raman scattering for spectral phase retrieval and signal amplification.
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We study interference between a local oscillator and coherent anti-Stokes Raman scattering signal fields by controlling their relative phase and amplitude. This control allows direct observation of the real and imaginary components of the third-order nonlinear susceptibility (chi((3))) of the sample. In addition, we demonstrate that the heterodyne method can be used to amplify the signal.
author list (cited authors)
Wang, X. i., Zhang, A., Zhi, M., Sokolov, A. V., Welch, G. R., & Scully, M. O.