The photoelectron angular distributions of H atoms in two-color linearly polarized laser fields

By calculating the photoelectron angular distributions of H atoms driven by two-color linear polarization laser pulses, we investigate the influence of ionization channels on the photoelectron angular distributions. For a fixed final kinetic energy of photoelectron E k  =  qω1, qω1 =  lω1 +  mω2, in which l is the number of photons absorbed from laser with a wavelength of λ1, m is the number of photons absorbed from laser with a wavelength of λ2, and the combination ( l, m) is an ionization channel. We find that the photoelectron angular distributions are obviously dependent on ionization channels. For a given ionization channel, the low-order phased Bessel function, which corresponds to the smaller number of photon absorbed, has the main contribution to the photoelectron angular distributions. We also find that the relative direction of the polarization vector of two laser pulses has significant influence on the photoelectron angular distributions. By changing the relative direction between two polarization vectors, we can control the emission direction of photoelectrons.