A versatile beamline for attosecond photoelectron and photon spectroscopy
Abstract
We report on the development of a versatile attosecond beamline for ultrafast spectroscopy of atoms and molecules, as well as for the metrology of infrared laser pulses. Using a few-cycle pulse (approximately 5 fs) for driving the high-order harmonic generation process, we show that the modulation of the harmonic flux in the cut-off spectral region, induced by a weak perturbing field, enables complete electric-field characterization of the perturbing pulse. Phase-sensitive detection with a lock-in amplifier further reveals polarization-dependent effects, observed as modulations at twice the fundamental optical frequency, emphasizing the sub-laser-cycle electronic control inherent to the measurement technique. In addition, the beamline supports the implementation of two-color (extreme ultraviolet and infrared) phase-sensitive experiments using approximately 30 fs pulses and a velocity map imaging spectrometer (VMI). This configuration will enable the study of photoemission time delays in atomic and molecular systems. Together, these results establish the beamline as a robust and adaptable platform for probing attosecond dynamics across diverse experimental approaches.
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BibTeX
@misc{shah2026versatile,
title = {{A versatile beamline for attosecond photoelectron and photon spectroscopy}},
author = {Ronak Narendra Shah and Jahanzeb Muhammad and Ianina Kosse and Marvin Schmoll and Samuel Bengtsson and Riccardo Mori and Dominik Hoff and Gerhard G. Paulus and Fabio Frassetto and Luca Poletto and Giuseppe Sansone},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.10970},
eprint = {2611.10970},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.10970},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - A versatile beamline for attosecond photoelectron and photon spectroscopy
AU - Ronak Narendra Shah
AU - Jahanzeb Muhammad
AU - Ianina Kosse
AU - Marvin Schmoll
AU - Samuel Bengtsson
AU - Riccardo Mori
AU - Dominik Hoff
AU - Gerhard G. Paulus
AU - Fabio Frassetto
AU - Luca Poletto
AU - Giuseppe Sansone
PY - 2026
DA - 2026/11/07
PB - arXiv
DO - 10.48550/arxiv.2611.10970
UR - https://arxiv.org/abs/2611.10970
AB - We report on the development of a versatile attosecond beamline for ultrafast spectroscopy of atoms and molecules, as well as for the metrology of infrared laser pulses. Using a few-cycle pulse (approximately 5 fs) for driving the high-order harmonic generation process, we show that the modulation of the harmonic flux in the cut-off spectral region, induced by a weak perturbing field, enables complete electric-field characterization of the perturbing pulse. Phase-sensitive detection with a lock-in amplifier further reveals polarization-dependent effects, observed as modulations at twice the fundamental optical frequency, emphasizing the sub-laser-cycle electronic control inherent to the measurement technique. In addition, the beamline supports the implementation of two-color (extreme ultraviolet and infrared) phase-sensitive experiments using approximately 30 fs pulses and a velocity map imaging spectrometer (VMI). This configuration will enable the study of photoemission time delays in atomic and molecular systems. Together, these results establish the beamline as a robust and adaptable platform for probing attosecond dynamics across diverse experimental approaches.
ER -