Harmonic generation during ultrashort-pulse ultraintense p-polarized laserinteraction with solid target

In this Letter, we developed the "relativistic surface currents" model to i nvestigate the harmonic generation under the conditions of p-polarized obli quely incident ultrashort-pulse ultraintense laser. As a result of this Let ter, up to 70 harmonics are generated with conversion efficiencies exceedin g 10(-6), which is very close to the result from Norreys' experiment and Gi bbon's PIC simulations. For highly relativistic regime and nonrelativistic regime of laser power, the harmonic conversion efficiencies as a function o f laser strength parameter q are discussed. (C) 2001 Published by Elsevier Science B.V.