Relativistic Surface High Harmonic Generation

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Presentation transcript:

Relativistic Surface High Harmonic Generation A route to intense attosecond pulses ? Christian Rödel, Silvio Fuchs, Martin Heyer, Oliver Jäckel, Gerhard G. Paulus FSU Jena, Institut für Optik und Quantenelektronik, Helmholtz Institut Jena Michael Behmke, Toma Toncian, Dirk Hemmers, Mirela Cercez, Monika Toncian, Georg Pretzler, Oswald Willi HHU Düsseldorf, Institut für Laser- und Plasmaphysik Daniel an der Brügge, Alexander Pukhov HHU Düsseldorf, Institut für Theoretische Physik

Attosecond science - Introduction Hentschel et al.: Attosecond metrology, Nature 2007 shortest attosecond pulses: 80 as E. Goulielmakis et al. Science, 320, 1614 (2008)

High harmonic generation in gases 3-step model: (a) ionization, (b,c) motion of the free electron in the laser field, (d) recollision Corkum, Krausz: Attosecond science, Nature 2007

High Harmonic Spectra HHG spectrum in Neon, 50 fs, 1014 W/cm² Agostini, DiMauro: The physics of attosecond light pulses, Reports on Progress in Physics

But… … laser pulses were getting stronger Small-scale 10-100 TW laser systems, Ti:Sapphire 800nm, 10 Hz JETI laser @ IOQ: 27 fs, 800mJ ARCTURUS laser @ ILPP: 27 fs, 2.5 J 30% of laser energy in a 7µm2 focus I=1020 W/cm2

What happens at an ideal surface at Relativistic intensity ? Corkum, Krausz: Attosecond science, Nature 2007

Relativistic surface High harmonic generation PIC simulation with LPIC JETI laser parameters: a0=4.5, t=80fs, 45° p-pol incidence lambda/20 scale length oscillating plasma vacuum boundary

Relativistic surface High harmonic generation intensity harmonic number

Steep density gradient – high contrast laser pulses

High contrast laser pulses – plasma mirror

High contrast laser pulses - Plasma mirror

High contrast laser pulses - Plasma mirror

High contrast laser pulses - scale length

Experimental setup @ arcturus

Diagnostics - XUV Spectrometer

Experimental spectra with different contrast

Experimental spectra with different contrast

Where does the modulation come from? space / wavelength

Where does the modulation come from? space / wavelength

… Unequal temporal spacing of the attosecond pulse train ? sdf superposition of attosecond pulses emitted at times tk with assumed identical shape spectrum is given by the absolute square of the Fourier transform plasma surface motion can be approximated by a simple parabola, which corresponds to a linear chirp with emission times

… Unequal temporal spacing of the attosecond pulse train

… Unequal temporal spacing of the attosecond pulse train… … describes the spectral modulations indirect evidence of attosecond time structure of relativistic surface harmonics !!! And just as a outlook …

… according to the same Pic simulations ... … they are very short (100as)

Thank you for your attention

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