The polarization effect of a laser in multiphoton Compton scattering

• Published in: Chinese physics B 2014-05, Vol.23 (5), p.268-276
• Main Author: 梁国华 吕清正 滕爱萍 李英骏
• Format: Article
• Language: English
• Subjects: Charged particles; Compton散射; Cross sections; Elastic scattering; Frames; Lasers; Photons; Polarization; Quantum electrodynamics; 光子吸收; 多光子; 康普顿散射; 极化效应; 激光束; 电子速度; 量子电动力学
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/23/5/054103

The multiphoton Compton scattering in a high-intensity laser beam is studied by using the laser-dressed quantum electrodynamics （QED） method, which is a non-perturbative theory for the interaction between a plane electromagnetic field and a charged particle. In order to analyze in the real experimental condition, a Lorentz transformation for the cross section of this process is derived between the laboratory frame and the initial rest frame of electrons. The energy of the scattered photon is analyzed, as well as the cross sections for different laser intensities and polarizations and different electron velocities. The angular distribution of the emitted photon is investigated in a special velocity of the electron, in which for a fixed number of absorbed photons, the electron energy will not change after the scattering in the lab frame. We obtain the conclusion that higher laser intensifies suppress few-laser-photon absorption and enhance more-laser-photon absorption. A comparison between different polarizations is also made, and we find that the linearly polarized laser is more suitable to generate nonlinear Compton scattering.