Third Harmonic Generation from Perturbed Femtosecond Filaments in Air

Abstract : We investigate third harmonic generation from femtosecond laser filaments. A two-order-of-magnitude enhancement of third harmonic light is observed when the (signal) filament is perturbed by a second laser (pump) filament. This enhancement is studied as function of laser polarization, time delay between the pump and signal filaments, the pump filament energy, etc. Based on these systematic results, we attribute the enhancement to a quenching of the interference effects of the third harmonic generated in the first and second half of the signal filament. Numerical simulations based on a two-color propagation model reproduce well the experimental observations and confirms our explanation.
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https://hal-ensta-paris.archives-ouvertes.fr//hal-01118115
Contributor : Aurélien Houard <>
Submitted on : Wednesday, February 18, 2015 - 3:00:42 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:04 AM

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Yi Liu, Magali Durand, Yohann Brelet, Amélie Jarnac, Benjamin Forestier, et al.. Third Harmonic Generation from Perturbed Femtosecond Filaments in Air. Kaoru Yamanouchi, Gerhard G. Paulus, Deepak Mathur. Progress in Ultrafast Intense Laser Science, X, Springer International Publishing, pp.77-93, 2014, Springer Series in Chemical Physics, 978-3-319-00520-1. ⟨10.1007/978-3-319-00521-8_6 ⟩. ⟨hal-01118115⟩

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