Circularly polarized harmonic generation by intense bicircular laser pulses: Electron recollision dynamics and frequency dependent helicity

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Numerical solutions of time-dependent Schrdinger equations for one and two electron cyclic molecules Hnq+ exposed to intense bichromatic circularly polarized laser pulses of frequencies w1 and ω2, such that ω1/ω2 =n1/n(integer) produce circularly polarized high order harmonics with a cut-off recollision maximum energy at and greater than the linear polarization law (in atomic units) Nmω1 = Ip + 3.17Up, where Ip is the ionization potential and Up = (2E0)2 4ω2 is the ponderomotive energy defined by the field E0 (intensity I = cE02/8π) from each pulse and mean frequency ω = (ω1 + ω2) 2 . An electron recollision model in a rotating frame at rotating frequency δ ω = (ω1 -ω2) 2 predicts this simple result as a result of recollision dynamics in a combination of bichromatic circularly polarized pulses. The harmonic helicities and their intensities are shown to depend on compatible symmetries of the net pulse electric fields with that of the molecules.

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Journal of Physics B: Atomic, Molecular and Optical Physics

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