Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Poster I

A 8.26: Poster

Dienstag, 9. März 2010, 16:30–19:00, Lichthof

Design and Setup of a Broadband Collinear Attosecond Beamline — •Michael Schönwald, Christian Ott, Philipp Raith, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

We present the design of a new attosecond beamline which is currently being set up in our laboratory. Using 6-fs duration CEP-stabilized ultrashort laser pulses, high-harmonic radiation is generated in a cell filled with rare gases (typically Ar, Ne). The time delay (between the XUV and IR) is realized by a plane split mirror hit at gracing incidence. Another toroidal mirror is then used to refocus both the harmonic and the IR light onto a gas target in a 1:1 focusing geometry. With this novel experimental design we expect the advantage of the high interferometric stability of a monolithic scheme where both beams propagate exactly into the same direction. Furthermore, as we are only using gracing-incidence reflections off metal mirrors for refocusing of the EUV harmonics, we avoid bandwidth limitations associated with the normal incidence on a multilayer mirror. The beamline thus flexibly adapts to any harmonic photon-energy range obtained with different generation media. It also supports tunable and broad-band/ultrashort attosecond pulses by the application of gating techniques. Both design and construction stages of the setup will be shown, including simulations and first experiments on the characterization of the new source. As an outlook, possible future experiments will be briefly discussed, mainly focusing on interferometric approaches [1].

1. Pfeifer et al., Chem. Phys. Lett. 463, 11-24 (2008)