Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster Session II

A 26.21: Poster

Mittwoch, 8. März 2017, 17:00–19:00, P OG1

Two-color laser pulses and the phase of the phase — •Mohammad Adel Almajid and Dieter Bauer — Institut für Physik, Universität Rostock, 18051 Rostock, Germany

Phase of the phase (PoP) spectroscopy using two-color colinearly polarized laser pulses has been introduced and applied to the tunneling regime of strong-field ionization [1]. Briefly, the momentum-resolved photoelectron yield as a function of the relative phase between the strong ω and weak 2ω component of a colinearly polarized two-color pulse is measured and Fourier-transformed. This tells us how much and with which phase lag the yield changes with varying relative phase. We present results for the multiphoton regime. We find that the alternating PoP along the above-threshold ionization rings generates a characteristic checkerboard pattern in the PoP spectra. In the case of counter-circularly polarized ω-2ω. laser pulses a three-fold symmetry in the PoP spectra is obtained, as previously found in "ordinary" photoelectron spectra. There is a jump in the PoP signature at a particular radial photoelectron momentum.

[1] S. Skruszewicz et al., Phys. Rev. Lett. 115, 043001 (2015).