title: Coherent, nonlinear two-phonon Raman spectra of diamond.
abstract: This is the first reported observation of a second-order Raman spectrum by means of coherent Raman spectroscopy. Optically heterodyned Raman-induced Kerr-effect spectroscopy was used to study the two-phonon Raman peaks of a highly fluorescent sample of diamond with sensitivity exceeding that obtained in spontaneous scattering or other forms of coherent Raman techniques. The frequency of the one-phonon peak was measured to be 1333.1 +/- 0.5 cm(-1). The frequency of the sharp two-phonon peak was measured to be 2668.6 +/- 0.5 cm(-1), in agreement with lower-resolution spontaneous-scattering measurements.
authors.forename: G L
authors.initials: GL
authors.lastname: Eesley
authors.forename: M D
authors.initials: MD
authors.lastname: Levenson