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

Abstract

Momentum-resolved photoelectron emission from xenon in colinearly polarized two-color laser fields at above-threshold ionization conditions is studied both experimentally and theoretically. We utilize phase-of-the-phase spectroscopy as recently introduced by Skruszewicz et al (2015 Phys. Rev. Lett. 115 043001) to analyze the dependence of the yields on the relative phase φ between the fundamental and second harmonic laser fields. The resulting phase-of-phase spectra feature a characteristic checkerboard pattern, which can analytically be described within the strong-field approximation.