Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 25: Poster: Attosecond physics

A 25.1: Poster

Mittwoch, 14. März 2012, 16:30–19:00, Poster.V

CEP Spectral Interferometry measurements near the Cooper minimum in argon, using high-harmonic generation — •Matteo Ceci, Andreas Kaldun, Christian Ott, Philipp Raith, Kristina Meyer, Martin Laux, Yizhu Zhang, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany

High-order harmonic generation (HHG) from laser-atom or laser-molecule interaction carries information about the structure and dynamics of the bound electronic wave function interfering with the returning wave packet. HHG spectra allow to gain insight into the electronic configuration of atoms and molecules that could lead to time resolved observations and time-domain control of atomic and molecular-scale electron dynamics. In the present work we measured HHG spectra in argon in the energy range of the Cooper Minimum (CM). While a microscopic single-atom response effect (structure of the bound-state wavefunction) is the origin of the CM, its spectral position observed with HHG has previously been measured to depend on macroscopic (phase-matching) parameters [1]. In our work, a few cycle CEP-stabilised laser with a central wavelength around 730 nm has been used to study the dependence of the CM on macroscopic parameters such as pressure variation and transient dynamics within the fewcycle field of the pulse. The experimental observations are discussed in the framework of our recently developed CEP spectral interferometry (CEPSI) approach [2]. [1] J. P. Farrell et al. Phys. Rev. A 83, 023420 (2011). [2] C. Ott et al., submitted (2011).