Revealing laser-coherent electron features using phase-of-the-phase spectroscopy. (28th February 2020)

• Record Type: Journal Article
• Authors: Tulsky, V A; Krebs, B; Tiggesbäumker, J; Bauer, D
• Is Part Of: Journal of physics. Volume 53:Number 7(2020:Apr. 01)
• Publication Date: 2020-02-28
• Subjects: strong-field ionization -- photoelectron spectra -- attosecond physics; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/1361-6455/ab69ab
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: Phase-of-the-phase (PoP) spectroscopy is extended to two-color laser fields having a circularly counter-rotating polarization. In particular, the higher harmonics of the (two-color) phase information are analyzed in order to extract the laser-coherent part of the photoelectron spectra taken under complex target conditions. We illustrate this with a proof-of-principle simulation by considering strong-field electron emission from argon atoms within helium nanodroplets under realistic experimental conditions, i.e. a limited number of photoemission events. Multiple elastic scattering on neutral helium atoms creates a laser-incoherent background, but the higher harmonics of the PoP-signal allow to resolve the coherent contribution to the photoemission.