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Conference: Bucharest University Faculty of Physics 2009 Meeting

Section: Theoretical Physics and Applied Mathematics Seminar

Title:

Non-linear Compton effect with a laser pulse

Authors:

Madalina Boca and Viorica Florescu

Affiliation:

Department of Physics, University of Bucharest

E-mail

madalina.boca@g.unibuc.ro

Keywords:

Compton effect, Volkov solutions, super-intense laser field

Abstract:

We theoretically investigate the scattering of intense laser radiation on energetic electrons. The laser field is described as a pulse with a fixed propagation direction; this allows the use of relativistic Volkov solutions and leads to a transition amplitude which is a product of a three-dimensional delta function with an one-dimensional integral evaluated numerically. We study the dependence of the emitted photon spectrum on the pulse duration. In contrast with the monochromatic case, where the spectrum is discrete, in our case one obtains a continuous distribution with a succession of maxima located near the corresponding discrete values. The numerical calculations are done for different laser pulses and the effect of the laser pulse shape and duration are investigated. We have chosen laser pulses of duration varying between one and ten optical cycles, central frequencies being those corresponding to the fundamental and second harmonic of the Nd:YAG laser. For the incident electron energy we have considered two values: 46 GeV, which was used in the SLAC experiment [1] and 22 MeV, the value used in a laser-Compton experiment at the Idaho Accelerator Center [2]. The discrete spectrum of the emitted photon frequency obtained in the monochromatic case is replaced in the case of a pulse by a continuous distribution with a succession of maxima located near the corresponding discrete values. In the limit of very long pulses the maxima become sharper and higher, reducing to the monochromatic result. [1] Bula C et al 1996 Phys. Rev. Lett 76, 3116 [2] Chouffani K et al 2006 Laser and Particle Beams 24 411.