Attosecond electron pulses from interference of above-threshold de Broglie waves

摘要: It is shown that the above-threshold electron de Broglie waves, generated by an intense laser pulse at a metal surface are interfering to yield attosecond pulses. This interference of waves analog on superposition high harmonics from rare gas atoms, resulting in trains light Our model based Floquet analysis inelastic scattering oscillating double-layer potential, incoming field long duration surface. Owing inherent kinematic dispersion, propagation vacuum very different pulses, which propagate without changing shape. The clean structure current immediate vicinity largely degraded due propagation, but it partially recovers certain distances Accordingly, above surface, there exist “collapse bands,” where erratic or noise-like, and “revival layers,” consist ultrashort pulses about 250 durations parameter range we considered. maximum value densities such has been estimated be order couple tenth mA/cm 2 . photocurrent can perhaps used for monitoring ultrafast relaxation processes single atoms condensed matter.