Klaiber M, Hatsagortsyan K Z, Wu J, Luo S S, Grugan P, Walker B C
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.
Phys Rev Lett. 2017 Mar 3;118(9):093001. doi: 10.1103/PhysRevLett.118.093001. Epub 2017 Feb 27.
Recollision for a laser driven atomic system is investigated in the relativistic regime via a strong field quantum description and Monte Carlo semiclassical approach. We find the relativistic recollision energy cutoff is independent of the ponderomotive potential U_{p}, in contrast to the well-known 3.2U_{p} scaling. The relativistic recollision energy cutoff is determined by the ionization potential of the atomic system and achievable with non-negligible recollision flux before entering a "rescattering free" interaction. The ultimate energy cutoff is limited by the available intensities of short wavelength lasers and cannot exceed a few thousand Hartree, setting a boundary for recollision based attosecond physics.
通过强场量子描述和蒙特卡罗半经典方法，在相对论 regime 中研究了激光驱动原子系统的再碰撞。我们发现相对论再碰撞能量截止与 ponderomotive 势 (U_{p}) 无关，这与众所周知的 (3.2U_{p}) 标度不同。相对论再碰撞能量截止由原子系统的电离势决定，并且在进入“无再散射”相互作用之前可以通过不可忽略的再碰撞通量实现。最终的能量截止受到短波长激光可用强度的限制，不能超过几千哈特里，为基于再碰撞的阿秒物理学设定了一个边界。
