L. Plaja et al., GENERATION OF ATTOSECOND PULSE TRAINS DURING THE REFLECTION OF A VERYINTENSE LASER ON A SOLID-SURFACE, Journal of the Optical Society of America. B, Optical physics, 15(7), 1998, pp. 1904-1911
The normal-incidence reflectivity of a plasma generated on a solid sur
face by a very intense laser field is studied. We demonstrate that the
reflected field has the form of trains of subfemtosecond pulses under
suitable conditions. Particle-in-cell computations are presented and
compared with a naive moving-mirror model. The physical origin of this
behavior is discussed in terms of the relativistic motion of the elec
tron plasma. (C) 1998 Optical Society of America.