Third-harmonic generation and self-channeling in air using high-power 
femtosecond laser pulses

Aközbek, N.; Iwasaki, A.; Becker, A.; Scalora, M.; Chin, S. L.; Bowden, C. M.

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Third-harmonic generation and self-channeling in air using high-power femtosecond laser pulses

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Becker, A.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Aközbek, N., Iwasaki, A., Becker, A., Scalora, M., Chin, S. L., & Bowden, C. M. (2002). Third-harmonic generation and self-channeling in air using high-power femtosecond laser pulses. Physical Review Letters, 89(14): 143901.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-36E3-6

Abstract

It is shown, both theoretically and experimentally, that during laser pulse filamentation in air an intense ultrashort third- harmonic pulse is generated forming a two-colored filament. The third-harmonic pulse maintains both its peak intensity and energy over distances much longer than the characteristic coherence length. We argue that this is due to a nonlinear phase-locking mechanism between the two pulses in the filament and is independent of the initial material wave-vector mismatch. A rich spatiotemporal propagation dynamics of the third-harmonic pulse is predicted. Potential applications of this phenomenon to other parametric processes are discussed.