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VOLUME 43 (1986) | ISSUE 5 | PAGE 227
Nature of the anomalously strong cubic optical nonlinearity of a gaseous plasma
An explanation is offered for the circumstance that the efficiency of nonresonant four-wave processes (coherent anti-Stokes Raman scattering and third-harmonic generation) in the plasma of the laser breakdown of a gas is much higher than in a neutral gas. The explanation is based on a quasiresonant increase in the cubic susceptibility as the atoms and ions decay through highly excited states.