Stimulated Raman X waves in ultrashort optical pulse filamentation |
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| Authors: | Faccio Daniele Averchi Alessandro Dubietis Audrius Polesana Paolo Piskarskas Algis Di Trapani Paolo Couairon Arnaud |
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| Affiliation: | Consorzio Nazionale Interuniversitaro per le Scienze della Materia, Como, Italy. daniele.faccio@uninsubria.it |
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| Abstract: | We demonstrate that ultrashort pulse filamentation in liquids with strong Raman gain leads to the spontaneous formation of nonlinear X waves at a Raman-shifted wavelength. We measured as much as 75% energy conversion efficiency into a Raman X wave in ethanol starting from 1 ps pulses due to the group velocity matching between the pump and Raman X pulses. Large Raman gain of a weak seed signal was observed in water, associated with a strong spatiotemporal transformation of the seed into an X wave. |
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