Journal
OPTICS LETTERS
Volume 29, Issue 24, Pages 2923-2925Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.29.002923
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We demonstrate coherent anti-Stokes Raman scattering (CARS) heterodyne spectral interferometry for retrieval of the real and imaginary components of the third-order nonlinear susceptibility (X-(3)) of molecular vibrations. Extraction of the imaginary component of X-(3) allows a straightforward reconstruction of the vibrationally resonant signal that is completely free of the electronic nonresonant background and resembles the spontaneous Raman spectrum. Heterodyne detection offers potential for signal amplification and enhanced sensitivity for CARS microscopy. (C) 2004 Optical Society of America.
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