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A: Fachverband Atomphysik

A 31: Strong laser fields - II

A 31.2: Vortrag

Mittwoch, 7. März 2018, 14:30–14:45, K 2.019

Two-color laser pulses and “the phase of the phase” — •Mohammad Adel Almajid and Dieter Bauer — Institute of Physics, University of 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]. PoP spectra represent concisely how much and with which phase lag the photoelectron yield changes as a function of the relative phase between the two colors.

In the multiphoton regime, we find an alternating PoP along the above-threshold ionization rings, generating a characteristic checkerboard pattern in the PoP spectra, which can analytically be described within the strong-field approximation [2].

In the case of counter-circularly polarized ω-2ω laser pulses a three-fold symmetry in the PoP spectra is obtained, and there is a jump in the PoP signature at a particular radial photoelectron momentum, which can analytically be described using the saddle point equation.

[1] S. Skruszewicz et al., Two-Color Strong-Field Photoelectron Spectroscopy and the Phase of the Phase, Phys. Rev. Lett. 115, 043001 (2015).
[2] M. A. Almajid et al., Two-color phase-of-the-phase spectroscopy in the multiphoton regime, J. Phys. B: At. Mol. Opt. Phys. 50, 194001 (2017).