Abstract

We discuss a technique for nonlinear Raman spectroscopy that utilizes two orthogonally polarized, frequency-degenerate pump waves whose relative phase is modulated. A phase-modulated signal wave results from the mixing of the pump waves and a probe wave through the third-order, nonlinear susceptibility χ³. Heterodyne detection of the signal wave yields signals linear in χ³, permits measurement of both the real and the imaginary parts of χ³, and routinely provides shot-noise-limited sensitivities. Expressions for signal voltages are derived and typical spectra quantitatively analyzed.

© 1985 Optical Society of America

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