Low - energy Photoelectron Holography Under Infrared Laser Irradiation

In recent decades, intense laser interaction with atomic and molecular processes has been a hot topic in the field of strong field physics. In the strong field of laser, atomic and molecular ionization will occur, the ionization of electrons in the laser pointer field under the action of a certain probability to return to the mother nucleus and the mother nucleus scattering, the process of recording the mother nucleus information. Scattering electron trajectories and non-scattered electron trajectories can interfere, they are similar to the process of optical holographic signal light and reference light, so the interference process is called photoelectron holography. The phase extraction of the atomic scattering amplitude and the reconstruction of the initial phase distribution of the molecular tunnel ionization have been realized by using photoelectron holography. The recent experimental results show that the low-energy part of the photoelectron interference structure and the high-energy part is not the same, the low-energy electron interference structure of the physical reason is not clear.

The ultrafast laser research team led by Prof. Lu Peixiang of Wuhan National Optoelectronics Laboratory calculated the electron momentum spectra of the atoms under intense green laser pointer irradiation in the strong field using the quantum-trajectory Monte Carlo method. It is found that the low energy electron holographic structure is completely different from the physical cause of the high energy electron holographic structure. The low energy electron holography is derived from the non - scattered electron trajectory and Interference between electron trajectories of cubic scattering. This study provides a theoretical guidance for the wide application of photoelectron holography in the field of atomic and molecular physics.