Kiel 2011 – wissenschaftliches Programm

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SYCP: Symposium Charged particles in ultra-short fields

SYCP 1: Charged particles in ultra-fast fields

SYCP 1.1: Hauptvortrag

Donnerstag, 31. März 2011, 14:00–14:30, HS D

Relativistic plasma mirrors: from attoseconds to zeptoseconds — •Alexander Pukhov — University of Duesseldorf, Germany

Generation of high harmonics from overdense plasmas is considered in relativistic regime. It is shown that the plasma surface oscillates as a relativistic mirror and leads to quasiperiodic ultrashort flashes of xuv radiation. Already at the presently available laser intensity levels the generated xuv pulses may be of sub-attosecond duration. The frequency spectrum of the high harmonics can be described as a power law. The most common exponent of the power law is -8/3. However, there are important exceptions leading to much flatter spectra. These spectra are produced due to the electron nanobunching phenomenon. In this case, the generated attosecond pulses may have significantly higher intensity than the incident laser pulse. Due to the temporal laser pulse profile, the high harmonics are chirped. This chirp is observed in experiments as spectral modulations and displacement of the individual harmonic lines.