We demonstrate theoretically that the high-order harmonic of an atom can be generated by a circularly polarized laser pulse.The harmonic spectrum shows a clear cutoff with an energy Ip + 2Up.In particular,the high-order harmonic generation comes from the multiple recombination of the ionized electron with non-zero initial velocity.These results are verified by the classical model theory and the time-frequency analysis of a harmonic spectrum.
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机译:MATHEMATICAL TREATMENT USING RUNGE-KUTTA (RK-4) METHOD FOR HERMITE GAUSSIAN (H-G) LASER PULSE IN VACUUM FOR CIRCULARLY POLARIZED LASER PULSE AND LINEARLY POLARIZED LASER PULSE, AND EFFECTS OF DECENTRE PARAMETER AND ELECTRON ENERGY GAIN VERSUS LASER INTENSITY PARAMETER