首页|Self-consistent extraction of photoabsorption time delays in attosecond streak camera
Self-consistent extraction of photoabsorption time delays in attosecond streak camera
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Self-consistent extraction of photoabsorption time delays in attosecond streak camera
Photoionization can generally be decomposed into a photoabsorption process plus a half-scattering process.The streaking time delay observed in the attosecond streak camera,correspondingly,can be decomposed into a photoabsorption time delay and a continuum time delay.We propose a self-consistent method to account for the potential-laser coupling effect and extract the intrinsic absorption time delay,without invoking an implicit assumption of a constant continuum correction made in previous streaking studies.The concept is based on an iterative technique starting from an initial guess of the absorption time delay and using classical electron trajectories to consistently remove the coupling-induced momentum shift to the streak signal.We show that the self-consistent iterative algorithm converges quickly and is robust against different initial guesses.The method is applied to laser-induced ionization of atoms to obtain the absorption time delay in resonant two-photon ionization and to explore possi-ble time delays in above-threshold ionization.The results confirm an absorption time delay linearly dependent on the ionizing pulse duration in resonant two-photon ionization.The method is also shown to perform better than conventional methods and to identify a small negative absorption time delay(less than 2 attoseconds)in above-threshold ionization.
attosecond streak cameraphotoabsorption time delayphotoionization
Yutong Gao、Hongcheng Ni、Andreas Becker、Jian Wu
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State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200241,China
Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China
JILA and Department of Physics,University of Colorado,Boulder 80309-0440,USA
Chongqing Key Laboratory of Precision Optics,Chongqing Institute of East China Normal University,Chongqing 401121,China
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attosecond streak camera photoabsorption time delay photoionization
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