Asymmetric self-phase modulation and compression of short laser pulses in plasma channels |
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Authors: | Gordon D F Hafizi B Hubbard R F Peñano J R Sprangle P Ting A |
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Institution: | Icarus Research, Inc, PO Box 30780, Bethesda, Maryland 20824-0780, USA. |
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Abstract: | 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. |
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