Third-Harmonic Generation and Self-Channeling in Air Using High-Power Femtosecond Laser Pulses
N. AközbekTime Domain Corporation, 7057 Old Madison Pike, Huntsville, Alabama 35806, USAAtsushi IwasakiDépartement de Physique, de Génie Physique et d’Optique and Centre d’Optique, Photonique et Laser, Université Laval, Québec, Québec G1K 7P4, CanadaAndreas BeckerFakultät für Physik, Universität Bielefeld, Postfach 100 131, D-33501 Bielefeld, GermanyMichael ScaloraU.S. Army Aviation and Missile Command, AMSAM-WS-RD-ST, Huntsville, Alabama 35898-5000S. L. ChinDépartement de Physique, de Génie Physique et d’Optique and Centre d’Optique, Photonique et Laser, Université Laval, Québec, Québec G1K 7P4, CanadaC. M. BowdenU.S. Army Aviation and Missile Command, AMSAM-WS-RD-ST, Huntsville, Alabama 35898-5000
2002en
ABI
Аннотация
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.
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