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2. JuSPARC-Kolloquium: "Generation of high intensity attosecond X-ray pulses"

05.12.2012 14:00 Uhr
05.12.2012 15:00 Uhr
Jülich Supercomputing Centre, Rotunde, Geb. 16.4, R. 301

Dr. Julia Mikhailova, Max-Planck-Institut für Quantenoptik, Garching

The current state-of-the-art in attosecond science typically involves extreme ultraviolet (XUV) pulses of ~100 as duration generated in noble gases [1], providing unprecedentedly short bursts of ionizing radiation that can be used for probing photoemission [2] and absorption dynamics [3, 4] with extremely high temporal resolution. However, these pulses generally are made of relatively small numbers of photons, resulting in intensities well within the linear regime of light-matter interaction. Recent insight into ultrafast laser‑plasma interactions offer the potential for much higher yields and photon energies by combining advanced concepts of ultrafast optical science and relativistic plasma physics [5, 6]. With the looming availability of high-intensity attosecond pulses derived from relativistic plasma dynamics driven by high-field, short-pulse laser sources [7, 8], the opportunity for the study of XUV and X-ray nonlinearities is on the horizon. For example, such pulses could help to answer fundamental questions regarding the nature of X-ray absorption near-edge structures present in many dielectric materials, while at the same time providing new techniques for pulse and material characterization.
The talk will be focused on the new methods to generate attosecond XUV/X-ray pulses of high photon energies and intensities utilizing high-harmonic generation in the interaction of relativistic-intensity laser pulses with solid targets. Research in this direction can have a great impact on the development of laboratory-scale intense and ultrashort XUV/X-ray sources with a great potential for real-time studies of electron phenomena in atoms, molecules and solids as well as biomedical imaging.

1. E. Goulielmakis et al., Single-cycle nonlinear optics, Science 320, 1614 (2008)
2. M. Schultze, et al., Delay in photoemission, Science 328, 1658 (2010)
3. E. Goulielmakis et al., Real-time observation of valence electron motion, Nature 466, 739 (2010)
4. A. Wirth, et al., Synthesized light transients, Science 334, 195 (2011)
5. Yu. M. Mikhailova et al. Generation of an attosecond X-ray pulse in a thin film irradiated by an ultrashort ultrarelativistic laser pulse, JETP Letters, 81, 571-574 (2005)
6. B. Dromey et al. High harmonic generation in the relativistic limit. Nat. Phys. 2, 456–459 (2006).
7. P. Heissler, et al. Few-cycle driven relativistically oscillating plasma mirrors: a source of intense, isolated attosecond pulses, Physical Review Letters, 108, 235003 (2012)
8. J.M. Mikhailova, et al. Isolated attosecond pulses from laser-driven synchrotron radiation, Physical Review Letters, (2012, in press)

Ort: Jülich Supercomputing Centre, Rotunda, building 16.4, room 301
Zeit: 5 December 2012, 14:00 Uhr