Attosecond temporal structure of non-consecutive harmonic combs revealed by multiple near-infrared photon transitions in two-color photoionisation

Attosecond temporal structure of non-consecutive harmonic combs revealed by multiple near-infrared photon transitions in two-color photoionisation

Abstract The metrology of attosecond pulse trains is based on a cross-correlation technique between a comb of extreme ultraviolet harmonics generated by the high-order harmonic generation process and a synchronised infrared field. The approach, usually referred to as reconstruction of attosecond bea...

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Main Authors: Praveen Kumar Maroju, Miguel Benito de Lama, Michele Di Fraia, Oksana Plekan, Matteo Bonanomi, Barbara Merzuk, David Busto, Ioannis Makos, Marvin Schmoll, Ronak Shah, Primož Rebernik Ribič, Luca Giannessi, Enrico Allaria, Giuseppe Penco, Marco Zangrando, Alberto Simoncig, Michele Manfredda, Giovanni De Ninno, Carlo Spezzani, Alexander Demidovich, Miltcho Danailov, Marcello Coreno, Richard J. Squibb, Raimund Feifel, Samuel Bengtsson, Emma Rose Simpson, Tamás Csizmadia, Mathieu Dumergue, Sergei Kühn, Kiyoshi Ueda, Gabriele Zeni, Fabio Frassetto, Luca Poletto, Kevin C. Prince, Johan Mauritsson, Johannes Feist, Alicia Palacios, Carlo Callegari, Giuseppe Sansone
Format: Article
Language:English
Published: Nature Portfolio 2025-05-01
Series:Communications Physics
Online Access:https://doi.org/10.1038/s42005-025-02123-z
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Summary:Abstract The metrology of attosecond pulse trains is based on a cross-correlation technique between a comb of extreme ultraviolet harmonics generated by the high-order harmonic generation process and a synchronised infrared field. The approach, usually referred to as reconstruction of attosecond beating by interference of two-photon transitions (RABBIT), allows one to recover the relative phase between the comb of consecutive odd harmonics, thus providing access to the attosecond temporal structure of the radiation. Seeded free-electron lasers have recently demonstrated the generation of combs consisting of even and odd harmonics of the seeding radiation. In this scheme, each harmonic is generated by an independent undulator (or set thereof), providing an additional degree of freedom in selecting the specific harmonics that make up the extreme ultraviolet comb. Here, we present results on the generation and temporal characterisation of a comb consisting of non-consecutive harmonics. The single-shot correlation analysis of the photoelectron spectra and the reordering of the single-shot data using an attosecond timing tool allow the reconstruction of the group delay dispersion of the harmonic comb and the temporal reconstruction of the attosecond pulse train.
ISSN:2399-3650

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