Active stabilization for ultralong acquisitions in an attosecond pump-probe beamline

Abstract

Attosecond time-resolution experiments using noncollinear interferometers require precise and active control of the optical delay to prevent instabilities - including both slow drifts and rapid vibrations - that can obscure the time evolution of the physical system under investigation. In this work, we present the design and results of stability measurements for a double interferometer setup for extreme ultraviolet-infrared pump-probe spectroscopy. The attosecond pump-probe setup is driven by a high-average-power, high-repetition-rate laser system and offers sub-optical-cycle (+/-81 as) stability with a fast feedback rate over extended periods (up to several days). Due to the noncollinear arrangement, the setup enables independent control of both amplitude and phase in the two arms even across significantly different spectral regions. As a proof of concept, we demonstrate attosecond beating in angle-resolved photoemission during two-photon, two-color photoionization, highlighting the broad potential of the system for kinematically and dynamically complete studies of atomic-scale light-matter interactions.

10 pages, 5 figures

References in corpus (8)

• Theory of attosecond delays in laser-assisted photoionization
• Attosecond photoionization dynamics in the vicinity of the Cooper minima in argon
• High-flux 100-kHz attosecond pulse source driven by a high average power annular laser beam
• Attosecond metrology in circular polarization
• Spectrally tunable ultrashort monochromatized extreme ultraviolet pulses at 100 kHz
• Ultrastable, high-repetition-rate attosecond beamline for time-resolved XUV-IR coincidence spectroscopy
• Polarization control of RABBITT in noble gas atoms
• In situ sub-50 attosecond active stabilization of the delay between infrared and extreme ultraviolet light pulses