Attosecond Delays of High-Harmonic Emissions from Hydrogen Isotopes Measured by XUV Interferometer

Mumta Hena Mustary; Liang Xu; Wanyang Wu; Nida Haram; Dane E. Laban; Han Xu; Feng He; R. T. Sang; Igor V. Litvinyuk

doi:10.34133/2022/9834102

Attosecond Delays of High-Harmonic Emissions from Hydrogen Isotopes Measured by XUV Interferometer

doi: 10.34133/2022/9834102

a Centre for Quantum Dynamics, Griffith University, Brisbane, Queensland 4111, Australia
b Key Laboratory for Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Collaborative Innovation Center for IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
c Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, 200093 Shanghai, China
d CAS Center for Excellence in Ultra-Intense Laser Science, Shanghai 201800, China

基金项目:

The experimental research was supported by the Australian Research Council (LP140100813 and DP190101145) and Griffith University. M. M. was supported by a Griffith University International Postgraduate Research Scholarship (GUIPRS) and a Griffith University Postgraduate Research Scholarship (GUPRS). Theoretical work was supported by the National Key R&D Program of China (Nos. 2018YFA0404802 and 2018YFA0306303), Innovation Program of Shanghai Municipal Education Commission (2017-01-07-00-02-E00034), National Natural Science Foundation of China (NSFC) (Grant Nos. 11574205, 91850203, and 12204308), and Shanghai Science and Technology Commission (GrantsNo. 22ZR1444100).

详细信息

通讯作者:
Correspondence should be addressed to Liang Xu

liangxu2021@usst.edu.cn, R. T. Sang

r.sang@griffith.edu.au,and Igor V. Litvinyuk

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出版历程
- 收稿日期: 2022-06-28
- 修回日期: 2022-09-18
- 刊出日期: 2022-11-09

Attosecond Delays of High-Harmonic Emissions from Hydrogen Isotopes Measured by XUV Interferometer

a Centre for Quantum Dynamics, Griffith University, Brisbane, Queensland 4111, Australia
b Key Laboratory for Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Collaborative Innovation Center for IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
c Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, 200093 Shanghai, China
d CAS Center for Excellence in Ultra-Intense Laser Science, Shanghai 201800, China

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摘要

摘要: High-harmonic spectroscopy can access structural and dynamical information on molecular systems encoded in the amplitude and phase of high-harmonic generation (HHG) signals. However, measurement of the harmonic phase is a daunting task.Here, we present a precise measurement of HHG phase difference between two isotopes of molecular hydrogen using the advanced extreme-ultraviolet (XUV) Gouy phase interferometer. The measured phase difference is about 200 mrad, corresponding to ~3 attoseconds (1 as = 10−18 s) time delay which is nearly independent of harmonic order. The measurements agree very well with numerical calculations of a four-dimensional time-dependent Schödinger equation. Numerical simulations also reveal the effects of molecular orientation and intramolecular two-center interference on the measured phase difference.This technique opens a new avenue for measuring the phase of harmonic emission for different atoms and molecules. Together with isomeric or isotopic comparisons, it also enables the observation of subtle effects of molecular structures and nuclear motion on electron dynamics in strong laser fields.
- High Harmonic Generation, XUV interferometer, Attosecond Delay, Gouy Phase
Abstract: High-harmonic spectroscopy can access structural and dynamical information on molecular systems encoded in the amplitude and phase of high-harmonic generation (HHG) signals. However, measurement of the harmonic phase is a daunting task.Here, we present a precise measurement of HHG phase difference between two isotopes of molecular hydrogen using the advanced extreme-ultraviolet (XUV) Gouy phase interferometer. The measured phase difference is about 200 mrad, corresponding to ~3 attoseconds (1 as = 10−18 s) time delay which is nearly independent of harmonic order. The measurements agree very well with numerical calculations of a four-dimensional time-dependent Schödinger equation. Numerical simulations also reveal the effects of molecular orientation and intramolecular two-center interference on the measured phase difference.This technique opens a new avenue for measuring the phase of harmonic emission for different atoms and molecules. Together with isomeric or isotopic comparisons, it also enables the observation of subtle effects of molecular structures and nuclear motion on electron dynamics in strong laser fields.
- High Harmonic Generation, XUV interferometer, Attosecond Delay, Gouy Phase

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Attosecond Delays of High-Harmonic Emissions from Hydrogen Isotopes Measured by XUV Interferometer

doi: 10.34133/2022/9834102

通讯作者:
Correspondence should be addressed to Liang Xu

liangxu2021@usst.edu.cn, R. T. Sang

r.sang@griffith.edu.au,and Igor V. Litvinyuk

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Attosecond Delays of High-Harmonic Emissions from Hydrogen Isotopes Measured by XUV Interferometer

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Attosecond Delays of High-Harmonic Emissions from Hydrogen Isotopes Measured by XUV Interferometer

doi: 10.34133/2022/9834102

通讯作者: Correspondence should be addressed to Liang Xu liangxu2021@usst.edu.cn, R. T. Sang r.sang@griffith.edu.au,and Igor V. Litvinyuk

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出版历程

Attosecond Delays of High-Harmonic Emissions from Hydrogen Isotopes Measured by XUV Interferometer

计量

出版历程

目录

通讯作者:
Correspondence should be addressed to Liang Xu

liangxu2021@usst.edu.cn, R. T. Sang

r.sang@griffith.edu.au,and Igor V. Litvinyuk