Odd harmonics-enhanced supercontinuum in bulk solid-state dielectric medium

Abstract : We report on generation of ultrabroadband, more than 4 octave spanning supercontinuum in thin CaF2 crystal, as pumped by intense mid-infrared laser pulses with central wavelength of 2.4 μm. The supercontinuum spectrum covers wavelength range from the ultraviolet to the mid-infrared and its short wavelength side is strongly enhanced by cascaded generation of third, fifth and seventh harmonics. Our results capture the transition from Kerr-dominated to plasma-dominated filamentation regime and uncover that in the latter the spectral superbroadening originates from dramatic plasma-induced compression of the driving pulse, which in turn induces broadening of the harmonics spectra due to cross-phase modulation effects. The experimental measurements are backed up by the numerical simulations based on a nonparaxial unidirectional propagation equation for the electric field of the pulse, which accounts for the cubic nonlinearity-induced effects, and which reproduce the experimental data in great detail.
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https://hal-ensta-paris.archives-ouvertes.fr//hal-01347097
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Submitted on : Wednesday, July 20, 2016 - 12:27:01 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:04 AM

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N Garejev, Vytautas Jukna, Gintaras Tamosauskas, M. Velicke, R. Suminas, et al.. Odd harmonics-enhanced supercontinuum in bulk solid-state dielectric medium. Optics Express, Optical Society of America, 2016, 24, pp.17060. ⟨10.1364/OE.24.017060⟩. ⟨hal-01347097⟩

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