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A route to intense attosecond pulses ? RELATIVISTIC SURFACE HIGH HARMONIC GENERATION Christian Rödel, Silvio Fuchs, Martin Heyer, Oliver Jäckel, Gerhard.

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Presentation on theme: "A route to intense attosecond pulses ? RELATIVISTIC SURFACE HIGH HARMONIC GENERATION Christian Rödel, Silvio Fuchs, Martin Heyer, Oliver Jäckel, Gerhard."— Presentation transcript:

1 A route to intense attosecond pulses ? RELATIVISTIC SURFACE HIGH HARMONIC GENERATION 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

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

3 HIGH HARMONIC GENERATION IN GASES Corkum, Krausz: Attosecond science, Nature step model: (a) ionization, (b,c) motion of the free electron in the laser field, (d) recollision

4 HIGH HARMONIC SPECTRA HHG spectrum in Neon, 50 fs, W/cm² Agostini, DiMauro: The physics of attosecond light pulses, Reports on Progress in Physics

5 BUT… … laser pulses were getting stronger Small-scale TW laser systems, Ti:Sapphire 800nm, 10 Hz JETI IOQ: 27 fs, 800mJ ARCTURUS ILPP: 27 fs, 2.5 J 30% of laser energy in a 7µm 2 focus I=10 20 W/cm 2

6 WHAT HAPPENS AT AN IDEAL SURFACE AT RELATIVISTIC INTENSITY ? Corkum, Krausz: Attosecond science, Nature 2007

7 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

8 RELATIVISTIC SURFACE HIGH HARMONIC GENERATION harmonic number intensity

9 STEEP DENSITY GRADIENT – HIGH CONTRAST LASER PULSES

10 HIGH CONTRAST LASER PULSES – PLASMA MIRROR

11 HIGH CONTRAST LASER PULSES - PLASMA MIRROR

12

13 HIGH CONTRAST LASER PULSES - SCALE LENGTH

14 EXPERIMENTAL ARCTURUS

15 DIAGNOSTICS - XUV SPECTROMETER

16 EXPERIMENTAL SPECTRA WITH DIFFERENT CONTRAST

17

18 WHERE DOES THE MODULATION COME FROM? space / wavelength

19 WHERE DOES THE MODULATION COME FROM? space / wavelength

20 sdf … UNEQUAL TEMPORAL SPACING OF THE ATTOSECOND PULSE TRAIN ? superposition of attosecond pulses emitted at times t k 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

21 … UNEQUAL TEMPORAL SPACING OF THE ATTOSECOND PULSE TRAIN

22 … 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 …

23 … ACCORDING TO THE SAME PIC SIMULATIONS... … THEY ARE VERY SHORT (100as)

24 THANK YOU FOR YOUR ATTENTION


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