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Strong-field response time and its implications on attosecond measurement

Chinese Physics B 2022年第3期31卷 16-23页

作者：陈超车佳殷谢雪娇王赏辛国国陈彦军 College of Physics and Information Technology Shaan'xi Normal UniversityXi'an 710119China College of Physics and Hebei Key Laboratory of Photophysics Research and Application Hebei Normal UniversityShijiazhuang 050024China School of Physics Northwest UniversityXi'an 710127China

To measure and control the electron motion in atoms and molecules by the strong laser field on the attosecond time scale is one of the research frontiers of atomic and molecular photophysics. It involves many new phenomena and processes and raises a series of questions of concepts, theories, and methods. Recent studies show that the Coulomb potential can cause the ionization time lag(about 100 attoseconds) between instants of the field maximum and the ionization-rate maximum. This lag can be understood as the response time of the electronic wave function to the strong-field-induced ionization event. It has a profound influence on the subsequent ultrafast dynamics of the ionized electron and can significantly change the time–frequency properties of electron trajectory(an important theoretical tool for attosecond measurement). Here, the research progress of response time and its implications on attosecond measurement are briefly introduced.

关键词： response time strong-field ionization Coulomb effect attosecond measurement

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Quantum-mechanical analysis of pulse reconstruction for a narrow bandwidth attosecond x-ray pulse

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Chinese Physics B 2009年第4期18卷 1473-1478页

作者：葛愉成 School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University

The photoelectron energy spectra （PESs） excited by narrow bandwidth attosecond x-ray pulses in the presence of a few-cycle laser are quantum-mechanically calculated. Transfer equations are used to reconstruct the detailed temporal structure of an attosecond x-ray pulse directly from a measured PES. Theoretical analysis shows that the temporal uncertainties of the pulse reconstruction depend on the x-ray bandwidth. The procedure of pulse reconstruction is direct and simple without making any previous pulse assumption, data fitting analysis and time-resolved measurement of PESs. The temporal measurement range is half of a laser optical cycle.

关键词： attosecond measurement photoelectron energy spectrum transfer equation pulse reconstruction

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Use of photoelectron laser phase determination method for attosecond measurements with quantum-mechanical calculations

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Chinese Physics B 2008年第6期17卷 2072-2077页

作者：葛愉成 Department of Technical Physics and DOE Key Laboratory of Heavy Ion Physics Peking University

This paper calculates quantum-mechanically the photoelectron energy spectra excited by attosecond x-rays in the presence of a few-cycle laser. A photoelectron laser phase determination method is used for precise measurements of the pulse natural properties of x-ray intensity and the instantaneous frequency profiles. As a direct procedure without any previous pulse profile assumptions and time-resolved measurements as well as data fitting analysis, this method can be used to improve the time resolutions of attosecond timing and measurements with metrological precision. The measurement range is half of a laser optical cycle.

关键词： attosecond measurement photoelectron spectrum laser phase determination transfer equation

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