Hannover 2010 – scientific programme

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A: Fachverband Atomphysik

A 13: Interaction with Strong or Short Laser Pulses I

A 13.4: Talk

Wednesday, March 10, 2010, 15:00–15:15, F 107

Relativistic high-order harmonic generation: Drift compensation and phase coherence — •Markus C. Kohler, Karen Z. Hatsagortsyan, and Christoph H. Keitel — Max-Planck-Institut für Kernphysik, Heidelberg, Deutschland

The progress in the high-order harmonic generation (HHG) with atomic targets above photon energies of 10 keV is hindered by relativistic effects. We put forward strategies to counteract the relativistic drift [1,2] and to achieve phase-matching at a high free-electron background for HHG in the relativistic regime. A complete, quantitative analysis of the macroscopic HHG yield from a gas jet for relativistic laser intensities is presented. Crucial issues influencing the efficiency are discussed. Two setups are considered: The driving field for HHG is either the field of counterpropagating strong attosecond pulses or that of an infrared laser field assisted by ultraviolet photons. The phase matching is achieved by either employing the additional HHG phase depending on the time delay between the driving pulses or quasi-phase matching schemes. In the optimized conditions, HHG with photon energies of several tenths of keV is feasible.

[1] K. Z. Hatsagortsyan, M. Klaiber, C. Müller, M. C. Kohler, and C. H. Keitel, J. Opt. Soc. Am. B 25, 93 (2008).

[2] M. Klaiber, K. Z. Hatsagortsyan, C. Müller, and C. H. Keitel, Opt. Lett. 33, 411 (2008).