关于Kramers-Henneberger哈密顿量在多光子电离计算中的应用

Symmetry Breaking of Kramers-Henneberger Atoms by Ponderomotive Force

It was believed that Kramers-Henneberger atoms in superintense laser field exhibit structure of "dichotomy". However this is not true for focused laser field. Because in focused laser, KH state electrons experience ponderomotive force, which will break the dichotomous structure.

Bogolyubov's averaging theorem applied to the Kramers-Henneberger Hamiltonian

We apply Bogolyubov's averaging theorem to the motion of an electron of an atom driven by a linearly polarized laser field in the Kramers-Henneberger frame. We provide estimates of the differences between the original trajectories and the trajectories associated with the averaged system as a function of the parameters of the laser field and the region of phase space. We formulate a modified Bogolyubov averaging theorem based on the Hamiltonian properties of the system, and show that this version is better suited for these systems. From these estimates, we discuss the validity of the Kramers-He…

Strong-field approximation for high-harmonic generation in infrared laser pulses in the accelerated Kramers-Henneberger frame

The strong-field approximation for high-harmonic generation in near-infrared and infrared laser pulses is formulated in the accelerated Kramers-Henneberger frame. The accompanying physical picture is discussed and the nature of the leading-order term is contrasted with that of the three-step model following the strong-field-approximation formulation in the length or velocity gauges. The theory is illustrated by high-harmonic generation spectra for atomic hydrogen.

光原子哈密顿量的精确非偶极Kramers-Henneberger形式：在原子稳定化和光电子能谱中的应用

Exact Nondipole Kramers-Henneberger Form of the Light-Atom Hamiltonian: An Application to Atomic Stabilization and Photoelectron Energy Spectra

将原子与时空相关激光场相互作用的精确非偶极最小耦合哈密顿量转化为经典自由电子在激光场中的静止坐标系，即，Kramers-Henneberger框架。新形式的哈密顿量被用来研究在高强度，高频率制度的非偶极效应。全三维非偶极{ \it ab initio}波包计算表明，电离几率随场强的增加而减小.我们确定了一个独特的签名，这种动态稳定的影响，在光电子能谱的发病。

Confirmation of Kramers-Henneberger Atoms

In a remarkable experiment, Eichmann et al. attained unprecedented acceleration of neutral atoms by strong short-pulse IR laser fields. The driving mechanism was identified as the ponderomotive force on excited electrons bound in Rydberg orbits that survive long enough to enable the atoms to reach the detector. However, the observed velocities lie somewhat above the theoretical prediction. The systematic discrepancy was attributed to "absolute laser intensity uncertainties or a slightly non-Gaussian intensity distribution". Here, we examine the process by transforming to the Kramers-Henneberge…

Robust Strategies for Affirming Kramers-Henneberger Atoms

Atoms exposed to high-frequency strong laser fields experience the ionization suppression due to the deformation of Kramers-Henneberger (KH) wave functions, which has not been confirmed yet in experiment. We propose a bichromatic pump-probe strategy to affirm the existence of KH states, which is formed by the pump pulse and ionized by the probe pulse. In the case of the single-photon ionization triggered by a vacuum ultra-violet probe pulse, the double-slit structure of KH atom is mapped to the photoelectron momentum distribution. In the case of the tunneling ionization induced by an infrared …