Abstract

The normal-incidence reflectivity of a plasma generated on a solid surface 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 naïve moving-mirror model. The physical origin of this behavior is discussed in terms of the relativistic motion of the electron plasma.

[Optical Society of America ]

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