Phase-dependent effects in multiphoton ionization induced by a laser field and its second harmonic.

摘要: We present calculations of ionization rates, angular distributions, and above-threshold-ionization spectra for a hydrogen atom in strong, two-color laser field. The two lasers are first- second-harmonic fields with the same intensity constant relative phase difference between them. At longer wavelengths (1064 nm) higher intensities (g${10}^{13}$ W/${\mathrm{cm}}^{2}$), there is clear evidence dependence rates that takes place primarily through tunneling. Even though total rate this regime depends only on peak value time-dependent electric field, distributions show additional phase-sensitive effects. In particular, large forward-backward asymmetry emitted electron not simply correlated maximum shorter and/or lower intensities, transition to multiphoton interference paths from evident rates. all cases, we find ponderomotive shift limit sum shifts individual fields.