Theoretical exploration of control factors for the high-order harmonic generation (HHG) spectrum in two-color field

• The laser-parameter effects on HHG spectrum were studied.
• Different schemes were applied to discuss the function of intensity and CEP.
• An isolated 16as pulse was obtained by an ultrabroad XUV continuum of 208 eV.

In this work, the laser-parameter effects on the high-order harmonic generation (HHG) spectrum and attosecond trains by mixing two-color laser field, a visible light field of 800 nm and a mid-infrared (mid-IR) laser pulses of 2400 nm, are theoretically demonstrated for the first time. Different schemes are applied to discuss the function of intensity, carrier-envelope phase (CEP) and pulse duration on the generation of an isolated attosecond pulse. As a consequence, an isolated 16as pulse is obtained by Fourier transforming an ultrabroad XUV continuum of 208 eV with the fundamental field of duration of 6 fs, 9 × 1014 W/cm2 of intensity, the duration of 12 fs, the CEPs of the two driving pulses of −π   and the relative strength ratio R=0.2.

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