Drastic effects of damping mechanisms on the third-order optical nonlinearity

Details Drastic effects of damping mechanisms on the third-order optical nonlinearity Drastic effects of damping mechanisms on the third-order optical nonlinearity

2004-11-18

arxiv.org/abs/quant-ph/0411129v1

Physics

Quantum Physics

5pages, 2figures

Scientific paper

10.1143/JPSJ.74.2921

We have investigated the optical response of superradiant atoms, which undergoes three different damping mechanisms: radiative dissipation ($\gamma_r$), dephasing ($\gamma_d$), and nonradiative dissipation ($\gamma_n$). Whereas the roles of $\gamma_d$ and $\gamma_n$ are equivalent in the linear susceptibility, the third-order nonlinear susceptibility drastically depends on the ratio of $\gamma_d$ and $\gamma_n$: When $\gamma_d \ll \gamma_n$, the third-order susceptibility is essentially that of a single atom. Contrarily, in the opposite case of $\gamma_d \gg \gamma_n$, the third-order susceptibility suffers the size-enhancement effect and becomes proportional to the system size.

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