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The generation of harmonics by atoms interacting with two circularlypolarized and frequency related laser fields is addressed through ab initionumerical simulations. A detailed charaterization of a few specific harmonicsis given. In particular, the two different cases where the total energyabsorbed through photons is far-off or close to the energy gap betweendifferent atomic states are investigated. It is found that the conversionefficiency in the harmonic generation is strongly dependent on the inner atomicstructure and in certain specific cases it can be significantly enhanced withina small frequency range.Comment: Submitted to Appl. Phys. B, 4 page

Harmonic generation by atoms in circularly polarized laser fields: far-off and near resonance regimes