WGL
Audit
Events - today, tomorrow ... soon Highlights and News
tomorrow: Fr. 09:00-11:00
  Lehrveranstaltung: ▄bung 40955
Prof. Kurt Busch, Dan-Nha Huynh, Thomas Kiel
Max-Born-Institut
Computerorientierte Photonik
 
  
tomorrow: Fr. 11:00-13:00
  Lehrveranstaltung: Vorlesung 40450
Prof. Kurt Busch
Max-Born-Institut
Statistische Physik
 
  
22 May 2017: Turmoil in sluggish electrons' existence
An international team of physicists has monitored the scattering behavior of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as 'sluggish'. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence relatively still in a dielectric crystal lattice. This idyll has now been heavily shaken up by a team of physicists from various research institutions, including the Laboratory of Attosecond Physics (LAP) at the Ludwig-Maximilians-Universität Munich (LMU) and the Max Planck Institute of Quantum Optics (MPQ), the Institute of Photonics and Nanotechnologies (IFN-CNR) in Milan, the Institute of Physics at the University of Rostock, the Max Born Institute (MBI), the Center for Free-Electron Laser Science (CFEL) and the University of Hamburg. For the first time, these researchers managed to directly observe the interaction of light and electrons in a dielectric, a non-conducting material, on timescales of attoseconds (billionths of a billionth of a second). ...more.
 
12 April 2017: Thomas Fennel started as a Heisenberg fellow at the MBI
Prof. Thomas Fennel, group leader at the Institute of Physics at the University of Rostock, has been awarded a prestigious Heisenberg Fellowship funded by the Deutsche Forschungsgemeinschaft (DFG). With the Heisenberg fellowship, which officially started on January 1st 2017, the DFG is supporting a research project to explore new routes for imaging and controlling ultrafast electronic motion in nanostructures. The underlying research will be carried out in a joint effort between Prof. Fennel's team at the University of Rostock and researchers in division A of the Max Born Institute, which is led by Prof. Marc Vrakking and to which Prof. Fennel is affiliated as an associated researcher. ...more.
 
14 March 2017: Nanostructures give directions to efficient laser-proton accelerators
Nanostructured surfaces have manifold applications. Among others they are used to selectively increase aborption of light. You can find them everywhere, where light harvesting is the key point, e.g. in photovoltaics. But also in laser proton acceleration this approach attracts a lot of attention as nanostructured targets hold the promise to significantly increase maximum proton energies and proton numbers at a given laser energy. As for any other new technology, a high efficiency is a key for a potential future use. Scientists at the Max-Born-Institute (MBI) in Berlin have now investigated, under which conditions the use of nanostructures in laser ion acceleration is beneficial. ...more.
 
8 February 2017: Lattice of nanotraps and line narrowing in Raman gas
Decreasing the emission linewidth from a molecule is one of the key aims in precision spectroscopy. One approach is based on cooling molecules to near absolute zero. An alternative way is to localize the molecules on subwavelength scale. A novel approach in this direction uses a standing wave in a gas-filled hollow fibre. It creates an array of deep, nanometer-scale traps for Raman-active molecules, resulting inlinewidth narrowing by a factor of 10 000. ...more.
 
1st February 2017: Ultrasmall atom motions recorded with ultrashort x-ray pulses
Periodic motions of atoms over a length of a billionth of a millionth of a meter (10-15 m) are mapped by ultrashort x-ray pulses. In a novel type of experiment, regularly arranged atoms in a crystal are set into vibration by a laser pulse and a sequence of snapshots is generated via changes of x-ray absorption. ...more.
 
5 January 2017: Unified time and frequency picture of ultrafast atomic excitation in strong fields
The insight that light sometimes needs to be treated as an electromagnetic wave and sometimes as a stream of energy quanta called photons is as old as quantum physics. In the case of interaction of strong laser fields with atoms the dualism finds its analogue in the intuitive pictures used to explain ionization and excitation: The multiphoton picture and the tunneling picture. In a combined experimental and theoretical study on ultrafast excitation of atoms in intense short pulse laser fields scientists of the Max Born Institute succeeded to show that the prevailing and seemingly disparate intuitive pictures usually used to describe interaction of atoms with intense laser fields can be ascribed to a single nonlinear process. Moreover, they show how the two pictures can be united. The work appeared in the journal Physical Review Letters and has been chosen to be an Editors' suggestion for its particular importance, innovation and broad appeal. Beside the fundamental aspects the work opens new pathways to determine laser intensities with high precision and to control coherent Rydberg population by the laser intensity. ...more.
 
5 January 2017: Amplification of relativistic Electron Pulses by Direct Laser Field Acceleration
Controlled direct acceleration of electrons in very strong laser fields can offer a path towards ultra-compact accelerators. Such a direct acceleration requires rectification and decoupling of the oscillating electromagnetic laser field from the electrons in a suitable way. Researchers worldwide try to tackle this challenge. In experiments at the Max Born Institute, direct laser acceleration of electrons could now be demonstrated and understood in detail theoretically. This concept is an important step towards the creation of relativistic and ultra-short electron pulses within very short acceleration distances below one millimeter. Resulting compact electron and related x-ray sources have a broad spectrum of applications in spectroscopy, structural analysis, biomedical sciences and for nanotechnology. ...more.
 

 

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