Phase-matched coherent hard x-rays from relativistic high-order harmonic generation

Details Phase-matched coherent hard x-rays from relativistic high-order harmonic generation Phase-matched coherent hard x-rays from relativistic high-order harmonic generation

2010-08-03

arxiv.org/abs/1008.0511v1

Physics

Atomic Physics

Scientific paper

High-order harmonic generation (HHG) with relativistically strong laser pulses is considered employing electron ionization-recollisions from multiply charged ions in counterpropagating, linearly polarized attosecond pulse trains. The propagation of the harmonics through the medium and the scaling of HHG into the multi-kilo-electronvolt regime are investigated. We show that the phase mismatch caused by the free electron background can be compensated by an additional phase of the emitted harmonics specific to the considered setup which depends on the delay time between the pulse trains. This renders feasible the phase-matched emission of harmonics with photon energies of several tens of kilo-electronvolt from an underdense plasma.

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