High-order harmonic generation in a driven two level atom: An analogy with the three-step model

摘要

We provide a summarizing account of several features which relate high-order harmonic generation in a driven two-level atom to the well-known physical picture of an electron recombining with its parent ion. The similarities observed in both models can be traced back to common physical mechanisms, namely, three-step processes, which either involve the ground state and the continuum or the adiabatic states which follow from the diagonalization of the two-level Hamiltonian. Furthermore, using scaling laws, one may extend the parameter range to a physical situation for which the two-level atom picture can be applicable, as for instance solid-state systems in strong fields. [References: 48]