Effect of radiation pressure on the nonlinear susceptibility of resonant atoms
Kazantsev A. P., Surdutovich G. I., Yakovlev V. P.
The ponderomotive effect of light on resonant atoms with strong transitions over sufficiently long interaction times causes substantial changes in not only the magnitude of the nonlinear response of a system but also its parity as a function of the deviation from the resonant frequency.