Harmonic Generation from Laser-Irradiated Clusters

Details Harmonic Generation from Laser-Irradiated Clusters Harmonic Generation from Laser-Irradiated Clusters

2007-04-25

arxiv.org/abs/0704.3401v1

Physics

Plasma Physics

4 pages, ReVTeX4

Scientific paper

10.1103/PhysRevA.76.033201

The harmonic emission from cluster nanoplasmas subject to short, intense infrared laser pulses is analyzed by means of particle-in-cell simulations. A pronounced resonant enhancement of the low-order harmonic yields is found when the Mie plasma frequency of the ionizing and expanding cluster resonates with the respective harmonic frequency. We show that a strong, nonlinear resonant coupling of the cluster electrons with the laser field inhibits coherent electron motion, suppressing the emitted radiation and restricting the spectrum to only low-order harmonics. A pump-probe scheme is suggested to monitor the ionization dynamics of the expanding clusters.

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