6533b823fe1ef96bd127ed9f
RESEARCH PRODUCT
High-order harmonic generation in fullerenes using few- and multi-cycle pulses of different wavelengths
John W. G. TischW. A. OkellTobias WittingSébastien J. WeberAmelle ZaïrEmilio FiordilinoF. FrankRashid A. GaneevFranco PersicoC. HutchisonDario CricchioJonathan P. Marangossubject
PhysicsNanostructureSettore FIS/02 - Fisica Teorica Modelli E Metodi MatematiciFullerenebusiness.industryWave packetSettore FIS/01 - Fisica SperimentaleEnergy conversion efficiencyNonlinear opticsStatistical and Nonlinear PhysicsAtomic PhysicLaserSettore FIS/03 - Fisica Della MateriaAtomic and Molecular Physics and Opticslaw.inventionTheoretical PhysicWavelengthAtoms in strong laser fieldOpticslawPhysics::Atomic and Molecular ClustersHarmonicHigh harmonic generationAtomic physicsbusinessdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-12-03 | Journal of the Optical Society of America B |