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- W2920922562 abstract "The attoclock technique which maps the emission time of a photoelectron to its detection angle is an important tool in strong-field physics. Previously, it was implemented only with circularly or elliptically polarized laser fields. Here, we show how counter-rotating bicircular laser fields can be used as an attoclock to investigate the ionization dynamics in quasilinear polarization. This is achieved by choosing the ratio of the two field strengths in a way such that the vector potential has aspects of the attoclock and time is mapped directly to the photoelectron momentum, but the shape of the electric field corresponds to approximately linear polarization during three intervals per optical cycle. We report momentum distributions calculated by solving the time-dependent Schrodinger equation for a model helium atom and obtain the mapping from photoelectron momentum to ionization time using a trajectory-free method. Unlike circular polarization where the time of maximal ionization rate typically deviates less than 5 attoseconds from the maximium of the electric field, we find positive ionization times of more than 10 attoseconds in the quasilinear case." @default.
- W2920922562 created "2019-03-22" @default.
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- W2920922562 date "2019-03-18" @default.
- W2920922562 modified "2023-10-17" @default.
- W2920922562 title "Attoclock with counter-rotating bicircular laser fields" @default.
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- W2920922562 doi "https://doi.org/10.1103/physreva.99.031402" @default.
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