Abstract
We investigate laser-assisted electron-ion recombination (LAR), high-order harmonic generation (HHG) and above-threshold ionization (ATI) of argon atoms by a bicircular laser field, which consists of two coplanar counter-rotating circularly polarized fields of frequencies rω and sω. The energy of soft x rays generated in the LAR process is analyzed as a function of the incident electron angle and numerical results of direct recombination of electrons with Ar+ ions are presented. We also present the results of HHG by a bicircular field and confirm the selection rules derived earlier for inert-gas atoms in a p ground state. We show that the photoelectron spectra in the ATI process, presented in the momentum plane, as well as the LAR spectra exhibit the same discrete rotational symmetry as the applied field.
Highlights
The interaction of intense bicircular laser fields with atoms has recently received a lot of attention
A bicircular field is the superposition of two circularly polarized fields that rotate in the same plane, usually in opposite directions, with different frequencies
Counterrotating bicircular fields are known to generate very intense circularly polarized highorder harmonics that obey certain selection rules [1,2]. This can be understood in detail in the framework of quantum-orbit theory [3,4,5,6,7]
Summary
The interaction of intense bicircular laser fields with atoms has recently received a lot of attention.
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