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.
Keywords
Cite
@article{arxiv.2504.08448,
title = {Active stabilization for ultralong acquisitions in an attosecond pump-probe beamline},
author = {Tamás Csizmadia and Lénárd Gulyás Oldal and Barnabás Gilicze and Dániel Sándor Kiss and Tamás Bartyik and Katalin Varjú and Subhendu Kahaly and Balázs Major},
journal= {arXiv preprint arXiv:2504.08448},
year = {2025}
}
Comments
10 pages, 5 figures