Phys. Rev. Lett. 103, 043901 (2009) [4 pages]Intensity Spikes in Laser Filamentation: Diagnostics and ApplicationReceived 16 February 2009; published 20 July 2009 We present calculations with subcycle precision of laser-driven filamentation in argon which show that the laser peak intensity can exceed the clamping intensity by a factor of 3 during recurring spikes which can last over several centimeters of propagation. The high intensity occurs during a few-femtosecond subpulse in the trailing edge of the main pulse and gives rise to isolated 500 attosecond, 2 pJ pulses which can be extracted from the filament. We also show that the high harmonic radiation emerging from the filament is an excellent diagnostic of the intensity spikes. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.043901
DOI:
10.1103/PhysRevLett.103.043901
PACS:
42.65.Re, 32.80.Wr, 42.65.Ky
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