22 May 2006 GeV-acceleration of electron by a superintense ultrashort laser pulse
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New mechanism of laser acceleration of a charged particle is studied. We found that particle acceleration with focused beam of superintense ultrashort laser pulse is determined by a combination of ponderomotive forces at rising and falling edges of laser pulse and a longitudinal component of laser electric field. Acceleration of electron, which moves along the laser wavevector, is crucially depends on whether or not the electron reaches the region behind the laser focus. Interpretation of this effect consists in that the laser longitudinal electric field at the electron trajectory in this region is a unidirectional one (oscillatory in the case of laser linear polarization and slowly varying in the case of laser circular polarization). Due to this effect it is possible to overcome the negative influence of a phase slippage in the particle-wave interaction, which substantially suppresses electron acceleration. The physical reason of a unidirectional influence of laser longitudinal electric field on accelerating electron consists in the difference in phase velocities of transverse and longitudinal components of a focused laser field. Owing to this mechanism, lasers of ultimate present-day parameters enable electron acceleration up to the energy ε ~ 1 GeV. Moreover, electron acceleration along the laser wavevector (in contrast to techniques currently considered) is not sensitive to field initial phase (there is no bunch effect), it is possible to accelerate slow electrons (electrons need not to be preaccelerated to relativistic velocities), and there are no problems with a removal of accelerated electron from the laser field.
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Vladimir D. Taranukhin, A. Bahari, "GeV-acceleration of electron by a superintense ultrashort laser pulse", Proc. SPIE 6256, ICONO 2005: Ultrafast Phenomena and Physics of Superintense Laser Fields; Quantum and Atom Optics; Engineering of Quantum Information, 625605 (22 May 2006); doi: 10.1117/12.679716; https://doi.org/10.1117/12.679716

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