Abstract
We study high-order harmonic generation in argon driven by an intense 800 nm laser field and a small fraction of its second harmonic. The intensity and divergence of the emitted even and odd harmonics are strongly modulated as a function of the relative delay between the two fields. We provide a detailed analysis of the underlying interference effects. The interference changes drastically when approaching the cutoff region due to a switch of the dominant trajectory responsible for harmonic generation.
Highlights
We study high-order harmonic generation in argon driven by an intense 800 nm laser field and a small fraction of its second harmonic
The underlying physics of High-order harmonic generation (HHG) is well described by the so-called three-step model [3,4,5]: an electron wave packet is created by tunneling through the Coulomb barrier deformed by the laser field; it is subsequently accelerated by the laser field; and returns to the atom where it recombines to the ground state, leading to the production of an XUV light burst
This process is repeated every half-cycle of the IR laser field, resulting in an attosecond pulse train (APT) with a pulse separation of one-half IR period and to a spectrum of odd harmonics
Summary
We study high-order harmonic generation in argon driven by an intense 800 nm laser field and a small fraction of its second harmonic. The intensity and divergence of the emitted even and odd harmonics are strongly modulated as a function of the relative delay between the two fields.
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