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Emission properties of electrons in two-level systems driven by DC - AC fields

The emission spectrum of an electron in a two-level system driven by DC - AC fields has been studied. We show that the emission spectrum generally consists of a static component, at low frequency, and doublets at all harmonics of the laser frequency. The phenomenon of low-frequency generation (LFG) is observed, and the conditions under which the LFG is intense and the localization is strong are obtained. The signature of the localization condition for this system in the emission spectrum is manifested.