We present the results of experimental and theoretical studies of high-order harmonic generation (HHG) in plasmas containing fullerenes using pulses of different duration and wavelength. We find that the harmonic cutoff is extended in the case of few-cycle pulses (3.5 fs, 29th harmonic) compared to longer laser pulses (40 fs, 25th harmonic) at the same intensity. Our studies also include HHG in fullerenes using 1300 and 780 nm multicycle (35 and 40 fs) pulses. For 1300 nm pulses, an extension of the harmonic cutoff to the 41st order was obtained, with a decrease in conversion efficiency that is consistent with theoretical predictions based on wave packet spreading for single atoms. Theoretical calculations of fullerene harmonic spectra using the single active electron approximation were carried out for both few-cycle and multicycle pulses.

Ganeev, R., Hutchison, C., Witting, T., Frank, F., Weber, S., Okell, W., et al. (2012). High-order harmonic generation in fullerenes using few-and multi-cycle pulses of different wavelengths. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. B, OPTICAL PHYSICS, 30(1), 7-12 [10.1364/JOSAB.30.000007].

High-order harmonic generation in fullerenes using few-and multi-cycle pulses of different wavelengths

FIORDILINO, Emilio;CRICCHIO, Dario;PERSICO, Francesco Saverio;
2012

Abstract

We present the results of experimental and theoretical studies of high-order harmonic generation (HHG) in plasmas containing fullerenes using pulses of different duration and wavelength. We find that the harmonic cutoff is extended in the case of few-cycle pulses (3.5 fs, 29th harmonic) compared to longer laser pulses (40 fs, 25th harmonic) at the same intensity. Our studies also include HHG in fullerenes using 1300 and 780 nm multicycle (35 and 40 fs) pulses. For 1300 nm pulses, an extension of the harmonic cutoff to the 41st order was obtained, with a decrease in conversion efficiency that is consistent with theoretical predictions based on wave packet spreading for single atoms. Theoretical calculations of fullerene harmonic spectra using the single active electron approximation were carried out for both few-cycle and multicycle pulses.
Settore FIS/02 - Fisica Teorica, Modelli E Metodi Matematici
Settore FIS/03 - Fisica Della Materia
Settore FIS/01 - Fisica Sperimentale
Ganeev, R., Hutchison, C., Witting, T., Frank, F., Weber, S., Okell, W., et al. (2012). High-order harmonic generation in fullerenes using few-and multi-cycle pulses of different wavelengths. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. B, OPTICAL PHYSICS, 30(1), 7-12 [10.1364/JOSAB.30.000007].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/72344
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