Electronic dynamics and frequency effects in circularly polarized strong-field physics

posted May 13, 2016, 10:51 PM by François Mauger   [ updated May 13, 2016, 11:19 PM ]

Abstract

We analyze, quantum mechanically, the dynamics of atomic ionization with a strong, circularly polarized, laser field. We show that the main source for non-adiabatic effects, defined as the deviations from the static-field configuration with corresponding instantaneous amplitude, is connected to an effective barrier lowering due to the laser frequency. Such non-adiabatic effects manifest themselves through ionization rates and yields that depart up to more than one order of magnitude from a static-field configuration which we take as a reference for comparison. As a rule of thumb, such non-adiabatic manifestations get stronger with increasing laser frequency. Beyond circular polarization and atomic targets, these results show the limits of standard instantaneous -- static-field like -- interpretation of laser-matter interaction and the great need for including time-dependent electronic dynamics.

Reference

F. Mauger, and A.D. Bandrauk - Electronic dynamics and frequency effects in circularly polarized strong-field physics - Journal of Physics B: Atomic, Molecular and Optical Physics 47, 191001 (2014)