47 46 Key research Area STRONG FIELD PHYSICS STRONG FIELD PHYSICS Key research Area NONLINEAR & RELATIVISTIC LASER PHYSICS Spectroscopy on highly charged ions is ideally suited for answering fundamental questions about atomic structure. In order to comprehend experimental observations, theoretical modelling including nonlinear light-matter interactions, quantum electrodyamics (QED) as well as relativistic correlations must be applied. Within the field of Nonlinear & Relativistic Laser Physics, ACP theoreticians are among the leading experts in this field. Moreover, the theoretical predictions are applicable for an extended laser intensity regime, to be reached in the next generation of laser sources which are currently under development at the European level with strong involvment of ACP‘s expertise. X-RAY OPTICS During strong field interaction with matter, secondary radiation is also emitted. Depending on the laser intensity and the kind of matter, the emitted radiation ranges from the THz to the x-ray region. Major advantages of laser-based sources are their spatial and temporal coherence. Whereas THz emission is studied at ACP on a mainly theoretical basis, there are many activities within the Center which concentrate on the generation and application of novel sources for X-ray Optics. Applications include Extreme light-matter interaction experiments, for instance the access to ultrashort wavelengths, are performed by studies of femtosecond laser radiation in a vacuum or in a noble gas environment. Investigation of High Harmonic Generation (HHG) in nanoscale semiconductors, reveiling ultrafast charge and electron dynamics. the lens-less imaging of nanostructures and the study of structural dynamics with time-resolved x-ray diffraction or spectroscopy. To realize such demanding experiments, ACP scientists are also involved in the development of new x-ray optical components, encompassing polarimeters, spectrometers, and detectors. Based on developmental progress of the new x-ray instrumentation, ACP scientists are, in cooperation with the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, at the forefront in applying x-ray spectroscopy on highly charged ions. WORLDWIDE STRONG FIELD PHYSICS COLLABORATIONS Both the experimental and theoretical work done by ACP scientists involved in the key research area of STRONG FIELD PHYSICS are highly demanding and require collaborative efforts. Hence, ACP researchers are strongly involved in many national and international research alliances which grant access to large-scale research infrastructures including high-power lasers and accelerators. Besides several national and international synchrotron sources, equipment includes the x-ray free electron lasers in Hamburg and at Stanford University (USA), as well as particle accelerators in Darmstadt and Lanzhou (China). Installation of the final power amplifier of the POLARIS laser system. Contact: Prof. Christian Spielmann | Phone: +49 3641 9-47230 | Email: Christian.spielmann@uni-jena.de
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