Abstract
By means of particle-in-cell simulations we have investigated a mechanism of the two-photon resonance conversion of the laser energy into electron plasma waves in the interaction of relativistic-intensity laser pulses with overdense laser-induced plasmas. This conversion is a consequence of the periodic action of the ponderomotive (magnetic) component of Lorentzian force on plasma electrons. When the relativistic-intensity linearly-polarized laser pulse irradiates plasma with the about 4-times overcritical density and steep profile, this action is resonant with electron plasma oscillations at a double-laser frequency. As a result a part of the laser energy is transfonned into the energy of plasma waves, hence into the energy of fast electrons.
© 2007 IEEE
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