Description
Investigating ultrafast dynamics in increasingly complex neutral molecular systems requires advanced spectroscopic techniques that offer high temporal resolution and robust statistics. Recent breakthroughs in table-top sources producing few-femtosecond (fs) ultraviolet (UV) pulses have unlocked new experimental pathways in this field [1, 2]. Here, we present a high-repetition-rate UV beamline driven by an Ytterbium fibre laser amplifier. Pulse post-compression from 150 fs to sub-20 fs durations is achieved using a single-stage, dispersion-engineered multipass cell (MPC) [3]. We demonstrate that this MPC can drive UV resonant dispersive wave (RDW) emission within a gas-filled capillary at rates up to 50 kHz [5]. The resulting few-fs UV pulses are combined with near-infrared (NIR) pulses in a versatile pump-probe configuration, enabling measurements with few-fs time resolution. This beamline is designed to operate in tandem with our double-sided spectrometer to facilitate high-statistics covariance measurements. A primary application of this unique beamline is investigating ultrafast chiral dynamics using time-resolved photoelectron circular dichroism (tr-PECD).
References
[1] V. Wanie et al., Nature 630, 109 (2024).
[2] L. Colaizzi et al., Nat. Commun. 15, 9196 (2024).
[3] L. Silletti et al., Opt. Lett. 48, 1842 (2023).
[4] J.C. Travers et al., Nat. Photonics 13, 547 (2019).
[5] L. Silletti et al., APL Photonics 10, 070801 (2025).
