Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 33: Interaction with strong or short laser pulses III

A 33.6: Vortrag

Donnerstag, 21. März 2013, 12:15–12:30, B 302

Measurement of the Gouy phase shift in two-color laser pulses — •Robert Irsig, Johannes Passig, Josef Tiggesbäumker, Thomas Fennel, and Karl-Heinz Meiwes-Broer — Insitut für Physik, Universität Rostock, Universitätsplatz 3, 18051 Rostock

The Gouy effect is well known as a phase shift of π of the electric field passing a focus region. In recent years, the Gouy effect was investigated using few cycle laser pulses to ionise rare gas atoms, taking benefit of the strong asymetric field distribution [1,2]. Depending on the phase of the laser pulses, electron spectra show a characteristic behaviour in energy distribution and emission direction. That allows for an absolute phase reconstruction. In contrast to few cycle experiments, we present first phase-depending measurements using intense two-color laser pulses of 150 fs (FWHM). By varying the phase-shift in between first and second harmonic, one can synthesise asymetric light fields which enables to controll electron emission. A home-build stereo-time-of-flight-spectrometer is used to simultaneous detect the electrons emitted in opposite directions with respect to the laser polarisation axis. By applying a focus scan, we can directly map the Gouy phase shift along the propagation direction in the electron spectra.

[1] Lindner et. al., Phys. Rev. Lett 92, 113001 (2004)

[2] Shivaram et. al., Optics Letters 35, 3312 (2010)