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Events - today, tomorrow ... soon Highlights and News
today: 2017/03/30
  Seminar B: Seminar Bereich B
Seminarraum B, 10:00 h   Dr. Robert Jung
Max-Born-Institut
Work on Thin Disk Lasers - Development and Operation -
 
  
today: 2017/03/30
  Seminar B: Seminar Bereich B
Seminarraum B, 14:00 h   Dr. Georg Achazi
Universitńt Bern, Institute of Applied Physics
Tools and Methodologies for UV and deep-UV Coherent Spectroscopy
 
  
14 March 2017: Nanostructures give directions to efficient laser-proton acceleratorsr
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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