Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 34: Poster II

A 34.35: Poster

Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster

Hard x-ray harmonics from counter-propagating attosecond pulse trains — •Markus C. Kohler, Karen Z. Hatsagortsyan, and Christoph H. Keitel — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heildeberg, Germany

High-order harmonic generation with relativistically strong laser pulses employing highly charged ions is investigated. The magnetically induced drift of an ionized electron hinders the straightforward extension of the three-step process into the relativistic regime. However, the efficiency of rescattering can be significantly increased by employing counter-propagating attosecond pulse trains as fundamental laser source [1]. Here the electron is ionized by a first pulse undergoing a drift which can be reversed by a second counter-propagating pulse that yields the recombination. In this way, the energy of the revisiting electron at the atomic core can reach the MeV domain. In order to give evidence of a macroscopic harmonic yield after propagation through plasma, we analyze the conditions for rendering phase-matching of the harmonics possible and employ quasi-phase-matching schemes.

[1] K. Z. Hatsagortsyan, et al. J. Opt. Soc. Am. B 25, 93 (2008).