The paper is devoted to further investigation of the recently proposed method for generating tunable and phasecontrollable mid- and far-infrared pulses in gas irradiated by an intense two-color laser field composed of the chirped fundamental and its second-harmonic pulses with the group time delay. We present numerical calculations of the radiating low-frequency current density in atomic hydrogen in a wide range of the time delay and intensity of the fundamental pulse and analyze the intensity-dependence of the amplitude, duration and the tuning range of the generated pulses.
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