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The role of the Kramers–Henneberger atom in the higher-order Kerr effect

Maria Richter, Serguei Patchkovskii, Felipe Morales +2 more

We discuss the connection between strong-field ionization, saturation of the Kerr response and the formation of the Kramers–Henneberger (KH) atom and long-living excitations in intense infrared (IR) external fields. We present a generalized model for the intensity-dependent response of atoms in strong IR laser fields, describing deviations in the nonlinear response at the frequency of the driving field from the standard model. We show that shaping the driving laser pulse allows one to reveal signatures of the excited KH states in the Kerr response of an individual atom.We discuss the connection between strong-field ionization, saturation of the Kerr response and the formation of the Kramers–Henneberger (KH) atom and long-living excitations in intense infrared (IR) external fields. We present a generalized model for the intensity-dependent response of atoms in strong IR laser fields, describing deviations in the nonlinear response at the frequency of the driving field from the standard model. We show that shaping the driving laser pulse allows one to reveal signatures of the excited KH states in the Kerr response of an individual atom.

New Journal of PhysicsAug 6, 201363 citations

The role of the Kramers-Henneberger atom in the higher-order Kerr effect

S. Patchkovskii, Maria Richter, Felipe Morales +2 more

We present a generalized model for the intensity dependent response of atoms in strong IR laser fields, describing deviations in the nonlinear response at the frequency of the driving field from the standard model (linear Kerr effect + plasma defocusing) based on the formation of the stable KH states. According to our numerical simulations, shaping the driving laser pulse allows one to reveal a prominent resonance structure in the Kerr response of an individual atom, which can only be explained by population transfer into excited KH states.We present a generalized model for the intensity dependent response of atoms in strong IR laser fields, describing deviations in the nonlinear response at the frequency of the driving field from the standard model (linear Kerr effect + plasma defocusing) based on the formation of the stable KH states. According to our numerical simulations, shaping the driving laser pulse allows one to reveal a prominent resonance structure in the Kerr response of an individual atom, which can only be explained by population transfer into excited KH states.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)May 1, 20134 citations

Imaging the Kramers-Henneberger Atom

Felipe Morales, Maria Richter, Serguei Patchkovskii +1 more

We provide a unified concept for understanding and imaging excited state dynamics in atoms and molecules in intense laser fields, including microscopic description of high order Kerr non-linearities and their role in laser filamentation.

Research in Optical SciencesJan 1, 20125 citations

Formation of the bound state and resonance electron scattering by atoms in the external electromagnetic field in the presence of the ionization channel of decay

A. D. Gazazyan, Razmik G. Unanyan

Journal of Experimental and Theoretical PhysicsJan 1, 19830 citations

Stabilization of an atomic system in a strong laser field and the Kramers-Henneberger approach

А. М. Попов, Olga V. Tikhonova, Ekaterina A. Volkova

Laser PhysicsJan 1, 19992 citations

Self-deformation of Kramers–Henneberger atoms in focused laser beams of circular polarization

Jun-Dong Xiang, Pingxiao Wang, Jiaxiang Wang +1 more

In intense field laser dressing of atoms, electrons follow the laser oscillation and undergo quiver motion just like free electrons but still weakly bound to the atomic core, thus forming a set of specific dressed states named Kramers-Henneberger (KH) states. For decades, it was widely believed that ground KH state hydrogen atoms in a circularly polarized laser field exhibit the symmetric structure of a perfect ring. But our study shows this is not a common structure because of the fact that KH atoms can only exist in intense laser fields which are practically focused laser beams. In focused laser field, KH state electrons have to experience the ponderomotive force, which might polarize the atom and reshape its structure. Only in a laser beam with small quiver amplitude and high frequency, can the symmetric circular structure be fully or partially preserved.In intense field laser dressing of atoms, electrons follow the laser oscillation and undergo quiver motion just like free electrons but still weakly bound to the atomic core, thus forming a set of specific dressed states named Kramers-Henneberger (KH) states. For decades, it was widely believed that ground KH state hydrogen atoms in a circularly polarized laser field exhibit the symmetric structure of a perfect ring. But our study shows this is not a common structure because of the fact that KH atoms can only exist in intense laser fields which are practically focused laser beams. In focused laser field, KH state electrons have to experience the ponderomotive force, which might polarize the atom and reshape its structure. Only in a laser beam with small quiver amplitude and high frequency, can the symmetric circular structure be fully or partially preserved.

Results in PhysicsJan 24, 20240 citations

Bound States Of A Free Electron: The Role Of The Kramers-Henneberger Atom In The Higher-Order Kerr Effect

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