Phys. Rev. Lett. 102, 015002 (2009) [4 pages]Ionization-Induced Small-Scaled Plasma Structures in Tightly Focused Ultrashort Laser PulsesReceived 17 July 2008; published 9 January 2009 The laser-matter interaction via optical-field ionization of a medium in a tightly focused ultrashort laser pulse is investigated by finite-difference-time-domain modeling of Maxwell’s equations. We show that, unlike in the case of the conventional quasioptical approach, the regime of interaction changes drastically above a certain critical angle of laser beam focusing, resulting in the generation of small-scaled plasma structures which strongly influence the local field distribution and scattering characteristics. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.015002
DOI:
10.1103/PhysRevLett.102.015002
PACS:
52.50.Jm, 42.25.Bs, 52.25.Jm
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