Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 22: Poster: Interaction with strong or short laser pulses

A 22.10: Poster

Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof

Kapitza-Dirac diffraction in a two-color laser field — •Matthias Maximilian Dellweg and Carsten Müller — Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf

The Kapitza-Dirac effect [1] is the diffraction of an electron beam on the periodic potential generated by a standing light wave. An experimental verification of the effect, as originally proposed, was accomplished only recently [2].

In this contribution, we study a generalization of the Kapitza-Dirac effect to the case of a bifrequent light field, where quantum interferences can be expected. To this end, we solve the Schrödinger equation numerically with a ponderomotive potential. Besides, a mathematical model in reduced dimensionality for the transition amplitude is presented. We demonstrate distinct interference signatures for various commensurate frequency ratios.

A

[1] P. L. Kapitza, P. A. M. Dirac, Proc. Cambridge Philos. Soc. 29, 297-300 (1933)

[2] D. L. Freimund, K. Aflatooni, H. Batelaan, Nature 413, 142-143 (2001)