Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 5: Attosecond physics

A 5.2: Vortrag

Montag, 18. März 2013, 14:30–14:45, B 305

Interferometric Laser Control of Attosecond Pulse Generation — •Philipp Raith, Christian Ott, Andreas Kaldun, Kristina Meyer, Christopher Anderson, Martin Laux, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg , Germany

Tailored attosecond pulses would allow to measure and control electron quantum dynamics in atoms and molecules on their natural time scale. Here, we control the generation of attosecond pulses and pulse trains, produced by high-harmonic generation, by two control variables: The carrier-envelope phase (CEP) of the driving laser field and a time delay between two variable sections of the laser spectrum [1]. We experimentally and numerically demonstrate that this multidimensional control scheme allows to independently set several properties of the produced attosecond pulses or pulse trains such as their relative phase and intensity ratio. Moreover, we show that the controlled interference of two temporally-spaced attosecond pulse trains leads to the generation of fractional high-harmonic combs [2]. Furthermore, we give experimental and computational evidence that an interference effect drastically magnifies the influence of subcycle time delays between spectral channels on the effective carrier-envelope phase of the synthesized laser field by rapidly moving the envelope temporally across a quasi-stationary carrier wave. This finding has important consequences for the CEP stabilization of few-cycle synthesized light fields.

[1] P. Raith et al., Opt. Lett. 36, 283-285 (2011).

[2] P. Raith et al., Appl. Phys. Lett. 100, 121104 (2012).