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Asymmetric Self-Phase Modulation and Compression of Short Laser Pulses in Plasma Channels

2003; American Physical Society; Volume: 90; Issue: 21 Linguagem: Inglês

10.1103/physrevlett.90.215001

1092-0145

D. Gordon, B. Hafïzi, R. F. Hubbard, J. R. Peñano, P. Sprangle, A. Ting,

Laser-induced spectroscopy and plasma

A relativistically intense femtosecond laser pulse propagating in a plasma channel undergoes dramatic photon deceleration while propagating a distance on the order of a dephasing length. The deceleration of photons is localized to the back of the pulse and is accompanied by compression and explosive growth of the ponderomotive potential. Fully explicit particle-in-cell simulations are applied to the problem and are compared with ponderomotive guiding center simulations. A numerical Wigner transform is used to examine local frequency shifts within the pulse and to suggest an experimental diagnostic of plasma waves inside a capillary.