Intrinsic pulse-width dependence of third-order nonlinear optical susceptibility in the femtosecond regime.

@article{Kim2004IntrinsicPD,
  title={Intrinsic pulse-width dependence of third-order nonlinear optical susceptibility in the femtosecond regime.},
  author={Min-su Kim and Choon Sup Yoon},
  journal={Physical review letters},
  year={2004},
  volume={93 20},
  pages={203903}
}
We demonstrate that the second-order coupling of local polarizations contributes significantly to the third-order nonlinear optical susceptibility chi((3)) through cascaded processes, as much as does direct third-order coupling. Temporal analysis of nonlinear polarization shows that chi((3)) depends intrinsically on pulse width if the pulse width is shorter than about 10 times the relaxation time of nonlinear polarization. Analysis of the pulse-width dependence of the third-order polarization… CONTINUE READING

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