High harmonic generation with nearly circular polarized pulses
Résumé
According to conventional wisdom, increasing ellipticity reduces high harmonic generation by several orders because the recollision probability decreases. This is the obvious conclusion drawn from the motion of an electron in a laser field without an envelope. In contrast, we report on a recollision channel with large return energy and a substantial probability, regardless the ellipticity, in which the laser envelope plays a dominant role in the energy gained by the electron, and in the conditions for the electron to come back to the core.
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