Discriminating between the Role of Phase Matching and that of the Single-Atom Response in Resonance Plasma-Plume High-Order Harmonic Generation

Noa Rosenthal, Gilad Marcus

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59 Scopus citations

Abstract

Resonance enhancement of high-order harmonic generation has recently been found in the interaction of intense ultrashort laser pulses with laser ablated plasma plumes. It is a promising route towards the production of an intense and coherent extreme ultraviolet radiation source. However, the mechanism of this resonance enhancement is still not clear. There are two possible explanations; one relies on a better recombination cross section through an autoionization state in the single-atom response. The other relies on improved phase matching conditions around the resonance. Here, we try to discriminate between these two conjectures by measuring coherence lengths of the harmonics, both on resonance and off resonance. Our findings support the single-atom response hypothesis.

Original languageAmerican English
Article number133901
JournalPhysical Review Letters
Volume115
Issue number3
DOIs
StatePublished - 22 Sep 2015

Bibliographical note

Publisher Copyright:
© 2015 American Physical Society.

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