Bonn 2000 – wissenschaftliches Programm

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A: Atomphysik

A 21: Poster II

A 21.20: Poster

Donnerstag, 6. April 2000, 17:00–19:30, Aula

Uniform electric and magnetic field assisted laser acceleration of electrons in vacuum — •Y. I. Salamin¹, C. H. Keitel¹, and F. H. M. Faisal² — ¹Theoretische Quantendynamik, Fakultät für Physik, Universität Freiburg, Hermann-Herder-Str. 3, D-79104 Freiburg. — ²Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld.

We are investigating optimum conditions for acceleration to high energy of electrons in vacuum by laser fields and in the added presence of constant uniform electric and/or magnetic fields. A DC electric field [1] helps the electron to quickly reach a forward velocity that is comparable to the phase velocity of the accelerating (laser) field and reduces the decelerating effect of phase-lippage. A DC magnetic field [2,3], on the other hand, guides the electron motion and, more importantly, launches it into cyclotron resonance with the accelerating field. Preliminary calculations [4] indicate that other schemes, e.g., the one employing anti-parallel DC electric and magnetic fields may lead to high energy gradients under certain conditions. In all of these schemes, the electron motion is accompanied by the emission of weak radiation at harmonics of the (pump) laser frequency that appear to be red-shifted for certain observation directions.

[1] Y. I. Salamin, C. H. Keitel, and F. H. M. Faisal (submitted to Phys. Rev. A).

[2] Y. I. Salamin, F. H. M. Faisal, and C. H. Keitel, (submitted to Phys. Rev. A).

[3] Y. I. Salamin and F. H. M. Faisal, Phys. Rev. A 61, (in press).

[4] Y. I. Salamin and C. H. Keitel, (in progress).