Two-color phase-of-the-phase spectroscopy in the multiphoton regime

Abstract

Momentum-resolved photoelectron emission from xenon in colinearly polarized\ntwo-color laser fields at above-threshold ionization conditions is studied both\nexperimentally and theoretically. We utilize phase-of-the-phase spectroscopy as\nrecently introduced by Skruszewicz et al., Phys. Rev. Lett. 115, 043001 (2015)\nto analyze the dependence of the yields on the relative phase $\\varphi$ between\nthe fundamental and second harmonic laser fields. The resulting phase-of-phase\nspectra feature a characteristic checkerboard pattern, which can analytically\nbe described within the strong-field approximation.\n