Attosecond pulses from a solid driven by a synthesized two-color field at megahertz repetition rate
Abstract
Probing coherent quantum dynamics in light-matter interactions at the microscopic level requires high-repetition-rate isolated attosecond pulses (IAPs) in pump-probe experiments. To date, the generation of IAPs has been mainly limited to the kilohertz regime. In this work, we experimentally achieve attosecond control of extreme-ultraviolet (XUV) high harmonics in the wide-bandgap dielectric MgO, driven by a synthesized field of two femtosecond pulses at 800nm and 2000nm with relative phase stability. The resulting quasi-continuous harmonic plateau with ~ 9 eV spectral width centered around 16.5 eV photon energy can be tuned by the two-color phase and supports the generation of an IAP (~ 730 attoseconds), confirmed by numerical simulation based on three-band semiconductor Bloch equations. Leveraging the high-repetition-rate driver laser and the moderate intensity requirements of solid-state high-harmonic generation, we achieve IAP production at an unprecedented megahertz repetition rate, paving the way for all-solid compact XUV sources for IAP generation.
Cite
@article{arxiv.2410.09178,
title = {Attosecond pulses from a solid driven by a synthesized two-color field at megahertz repetition rate},
author = {Zhaopin Chen and Mark Levit and Yuval Kern and Basabendra Roy and Adi Goldner and Michael Krüger},
journal= {arXiv preprint arXiv:2410.09178},
year = {2025}
}
Comments
28 pages, 10 figures