Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 44: Photonics II
Q 44.7: Vortrag
Donnerstag, 9. März 2017, 12:30–12:45, P 11
Attosecond scale coherent control of electron recombination in the polarization plane — •Ofer Kfir1,2, Sergey Zayko1, Christina Nolte3, Stefan Mathias3, Oren Cohen2, and Claus Ropers1 — 1IV. Physical Institute, University of Göttingen, Göttingen, Germany — 2Solid State Institute and Physics Department, Technion, Haifa, Israel — 3I. Physical Institute, University of Göttingen, Göttingen, Germany
The strong-field ionization of atoms and molecules in intense optical laser fields leads to a sequence of coherent recollisions of electrons with their parent ion, with attosecond timing information imprinted onto the emitted high-order harmonic radiation [1].
Here, we use a bi-chromatic field characterized by two orthogonal Jones vectors [2,3] that precisely control the phase, timing and orientation of attosecond recollisions in the two-dimensional polarization plane, under conditions that maintain a high recollision probability. Besides the generation of circularly polarized harmonics [2], we demonstrate the selective suppression or enhancement of different classes of harmonic orders by tuning the interference conditions of three subsequent attosecond recollisions. For example, we convert the typically suppressed harmonics in bi-circular fields to be bright and circularly polarized. This new control scheme provides attosecond access to the study of various two-dimensional phenomena in molecules, including sub-cycle charge redistribution.
[1] Shafir, Nature 485, 343 (2012). [2] Fleischer, Nat. Phot. 8, 543 (2014). [3] Milošević PRA 62, 11403 (2000).