Autocorrelation measurement of attosecond pulses based on two-photon double ionization

Fei Li; Kun Zhao; Bingbing Wang; Xin-Kui He; Zhi-Yi Wei

doi:10.1103/dshd-4j15

Autocorrelation measurement of attosecond pulses based on two-photon double ionization

Fei Li ^1,2, Kun Zhao ^2,3,*, Bingbing Wang ^2,4, Xin-Kui He^2,3,4, and Zhi-Yi Wei^2,3,4,†

¹Research Center for Advanced Optics and Photoelectronic, Department of Physics, College of Science, Shantou University, Shantou, Guangdong 515063, China
²Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
³Songshan Lake Materials Laboratory, Dongguan 523808, China
⁴University of Chinese Academy of Sciences, Beijing 100049, China

^*Contact author: zhaokun@iphy.ac.cn
^†Contact author: zywei@iphy.ac.cn

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Phys. Rev. A 112, 033109 – Published 15 September, 2025

DOI: https://doi.org/10.1103/dshd-4j15

Abstract

Autocorrelation measurement is theoretically demonstrated to characterize attosecond pulses by studying the two-photon double ionization (TPDI) process. An interferometric autocorrelation curve is presented in the change of TPDI probability with the time delay between two identical attosecond pulses, and its full width at half maximum (FWHM) $τ_{e}$ has a relationship $τ_{e} = 1.77 τ + 15$ with the FWHM $τ$ of the attosecond pulse. The curve is also decoded to obtain the center frequency and FWHM of the attosecond pulse by fitting.

Physical Review A

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Autocorrelation measurement of attosecond pulses based on two-photon double ionization

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Autocorrelation measurement of attosecond pulses based on two-photon double ionization

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