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Experimental observation of fractional echoes

Abstract : We report the observation of fractional echoes in a double-pulse excited nonlinear system. Unlike standard echoes, which appear periodically at delays which are integer multiples of the delay between the two exciting pulses, the fractional echoes appear at rational fractions of this delay. We discuss the mechanism leading to this phenomenon, and provide experimental demonstration of fractional echoes by measuring third harmonic generation in a thermal gas of CO2 molecules excited by a pair of femtosecond laser pulses.
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https://hal-insu.archives-ouvertes.fr/insu-03737479
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Submitted on : Thursday, July 28, 2022 - 4:00:34 PM
Last modification on : Friday, October 14, 2022 - 9:09:00 AM
Long-term archiving on: : Saturday, October 29, 2022 - 6:58:11 PM

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G. Karras, E. Hertz, F. Billard, B. Lavorel, G. Siour, et al.. Experimental observation of fractional echoes. Physical Review A, 2016, 94, 148, p. 1-16. ⟨10.1103/PhysRevA.94.033404⟩. ⟨insu-03737479⟩

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