Enhanced nonlinearity and transparency via autoionizing resonance.
The nonlinear response of an autoionizing medium in which coherence is established essentially by nonradiative interactions is analyzed. It is found that, by proper tuning of two radiation fields, the third-order nonlinearities can be enhanced while the absorption is canceled. The proposed scheme is particularly useful for enhancing nonlinearities in the VUV region.
Nakajima
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