Persistence of Coulomb focusing during ionization in the strong-field regime

Berman, Simon; Chandre, Cristel; Uzer, T.

doi:10.1103/physreva.92.023422

Cited by 11 publications

(20 citation statements)

References 19 publications

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“…Therefore, the competition between the Coulomb potential and laser interaction is always present even at high intensity, as shown in Ref. [24]. In summary, as expected for large ellipticities (i.e., close to CP), there is a very good agreement between the CCSFA [Eqs.…”

Section: A Short Time Scale Dynamicssupporting

confidence: 66%

“…11, we observe a good agreement between the exponents of P x of the reference Hamiltonian (1) at the bifurcation and the prediction 0.5 of Eq. (24). However, the exponent of P y at the bifurcation is much smaller than the exponent 1 predicted by Eq.…”

Section: Comparison With Experimentsmentioning

confidence: 70%

“…However, the exponent of P y at the bifurcation is much smaller than the exponent 1 predicted by Eq. (24).…”

Section: Comparison With Experimentsmentioning

confidence: 99%

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Inclusion of Coulomb effects in laser-atom interactions

et al. 2019

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We investigate the role of the Coulomb interaction in strong field processes. We find that the Coulomb field of the ion makes its presence known even in highly intense laser fields, in contrast to the assumptions of the strong field approximation. The dynamics of the electron after ionization is analyzed with four models for an arbitrary laser polarization: the Hamiltonian model in the dipole approximation, the strong field approximation, the Coulomb-corrected strong field approximation and the guiding center. These models illustrate clearly the Coulomb effects, in particular Coulomb focusing and Coulomb asymmetry. We show that the Coulomb-corrected strong field approximation and the guiding center are complementary, in the sense that the Coulomb-corrected strong field approximation describes well short time scale phenomena (shorter than a laser cycle) while the guiding center is well suited for describing long time scale phenomena (longer than a laser cycle) like Coulomb-driven recollisions and Rydberg state creation.

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Section: A Short Time Scale Dynamicssupporting

confidence: 66%

Section: Comparison With Experimentsmentioning

confidence: 70%

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Inclusion of Coulomb effects in laser-atom interactions

et al. 2019

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“…Coulomb focusing and the related caustic structures due to multiple recollisions of electrons [39][40][41] carry important information on the rescattering dynamics [42][43][44][45][46][47][48]. These dynamics have not been observed in experiments so far, because the rescattered electrons are embedded within a large background of direct photoelectrons.…”

Section: Introductionmentioning

confidence: 99%

Probing the ionization wave packet and recollision dynamics with an elliptically polarized strong laser field in the nondipole regime

et al. 2018

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We explore ionization and rescattering in strong mid-infrared laser fields in the nondipole regime over the full range of polarization ellipticity. In three-dimensional photoelectron momentum distributions (3D PMDs) measured with velocity map imaging spectroscopy, we observe the appearance of a sharp ridge structure along the major polarization axis. Within a certain range of ellipticity, the electrons in this ridge are clearly separated from the two lobes that commonly appear in the PMD with elliptically polarized laser fields. In contrast to the well-known lobes of direct electrons, the sharp ridge is created by Coulomb focusing of the softly recolliding electrons. These ridge electrons are directly related to a counterintuitive shift of the PMD peak opposite to the laser beam propagation direction when the dipole approximation breaks down. The ellipticity-dependent 3D PMDs give access to different ionization and recollision dynamics with appropriate filters in the momentum space. For example, we can extract information about the spread of the initial wave packet and the Coulomb momentum transfer of the rescattering electrons.

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“…In other words, the SFA cutoff for an initially monochromatic field of κ SFA = 3.17U p becomes κ SFA = 3.69U p after propagation to z = 0.37 mm due to the accumulated radiation at other frequencies, and this causes the increase in the cutoff energy. Nevertheless, the Coulomb interaction near τ m , though brief, is critical for making these higher energy recollisions accessible to the electrons [61]. Indeed, the only way that the trajectory shown in Fig.…”

Section: Evolution Of the High Harmonic Spectrummentioning

confidence: 99%

Classical versus quantum views of intense laser pulse propagation in gases

Berman

Chandre

Dubois

et al. 2019

J. Phys. B: At. Mol. Opt. Phys.

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We study the behavior of reduced models for the propagation of intense laser pulses in atomic gases. The models we consider incorporate ionization, blueshifting, and other nonlinear propagation effects in an ab initio manner, by explicitly taking into account the microscopic electron dynamics. Numerical simulations of the propagation of ultrashort linearly-polarized and elliptically-polarized laser pulses over experimentally-relevant propagation distances are presented. We compare the behavior of models where the electrons are treated classically with those where they are treated quantum-mechanically. A classical equivalent to the ground state is found, which maximizes the agreement between the quantum and classical predictions of the single-atom ionization probability as a function of laser intensity. We show that this translates into quantitative agreement between the quantum and classical models for the laser field evolution during propagation through gases of ground-state atoms. This agreement is exploited to provide a classical perspective on low-and highorder harmonic generation in linearly-polarized fields. In addition, we demonstrate the stability of the polarization of a nearly-linearly-polarized pulse using a two-dimensional model.

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Persistence of Coulomb focusing during ionization in the strong-field regime

Cited by 11 publications

References 19 publications

Inclusion of Coulomb effects in laser-atom interactions

Inclusion of Coulomb effects in laser-atom interactions

Probing the ionization wave packet and recollision dynamics with an elliptically polarized strong laser field in the nondipole regime

Classical versus quantum views of intense laser pulse propagation in gases

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