Abstract
One dimensional electron density perturbation is derived by using the cold fluid equation, Possion’s equation and the continuity equation. The perturbation is generated by a driving laser pulse propagating through a plasma. The upshifting of the frequency of a trailing pulse induced by density perturbation is studied by using optical metric. The results show that it is possible that the photon will gain energy from the wakefield when assuming photon’s number to be conserved, i.e., the photon will be accelerated.
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