München 2004 – wissenschaftliches Programm
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MO: Molekülphysik
MO 6: Cluster I
MO 6.7: Vortrag
Montag, 22. März 2004, 15:30–15:45, HS 332
Third harmonic generation and other nonlinear phenomena in laser-irradiated clusters — •Sergei V. Fomichev1, David F. Zaretsky2, Sergei V. Popruzhenko1, and Wilhelm Becker3 — 1Moscow Engineering Physics Institute (State Univ.), Moscow, Russia — 2Russian Research Center “Kurchatov Institute”, Moscow, Russia — 3Max-Born-Institut
For a cluster irradiated by a strong laser field, the electron dynamics are nonlinear due to the finite size of the system. This causes the presence of the third harmonic of the incident laser field both inside the cluster and in the scattered field. Since for ionized clusters of noble-gas atoms usually the Mie frequency is close to three times the (incident) Ti:Sapphire-laser frequency, the third-harmonic field may experience strong resonant enhancement. This leads, in particular, to efficient production of multicharged ions and x-ray emission in the cluster, as well as to resonant behavior of the cross section of third-harmonic generation. This cross section and the yield of multicharged ions are calculated for various laser parameters and cluster media and compared with the available experimental data.
References: S.V. Fomichev, S.V. Popruzhenko, D.F. Zaretsky, and W. Becker, J. Phys. B 36, 3817 (2003); Opt. Express 11, 1188 (2003).