Abstract
The polarization response of a quantum system modeling a silver atom in a strong laser field in the mid-IR frequency band has been investigated by direct numerical integration of the Schrödinger equation. It is shown that free electrons in the continuum appearing from multiphoton or tunnel ionization change the sign of the dielectric susceptibility at the fundamental frequency with an increase of radiation intensity even at a low level of ionization. The features of the high-order susceptibility of a model silver atom are studied in the nonperturbative regime.
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