Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 35: Attosecond physics
A 35.6: Vortrag
Donnerstag, 3. März 2016, 16:15–16:30, f107
Carrier-envelope phase evolution in focused few-cycle laser pulses — •Dominik Hoff1, Michael Krüger2,3, Lothar Maisenbacher3, A. Max Sayler1, Gerhard G. Paulus1, and Peter Hommelhoff2,3 — 1Helmholtz Institute Jena and Institute for Optics and Quantum Electronics, Jena — 2Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen — 3Max Planck Institute of Quantum Optics, Garching
Variation of the carrier-envelope phase (CEP) of few-cycle laser pulses has proven to be an effective way to control processes such as attosecond electron dynamics, chemical reactions, and high-harmonic generation. Thus, precise knowledge of the spatial dependence of the CEP is vital to understand and control these processes. Here we combine the recently developed techniques of high precision CEP measurement [1] and photoelectron re-scattering at metal nano-tips [2] to, respectively, provide the attosecond temporal and nanometer spatial resolution necessary to directly map the spatial dependence of the CEP. By scanning the focus with the nano-tip and recording the phase-tagged time-of-flight spectra, we are able to observe a substantial deviation from the monochromatic Gouy-phase. Further, with the help of a theory model we are able to relate our direct measurement of the focus to the chromatic properties of the beam prior to focusing.
[1] T. Wittmann et al., Nature Physics 5, 357 (2009).
[2] M. Krüger, M. Schenk, P. Hommelhoff, Nature 475, 78 (2011).