29 December 2017

Scientists measure accelerated emission after excitation by a free-electron laser

An international team, including scientists from DESY,  has verified a prediction about the quantum-mechanical behaviour of resonant systems made more than 50 years ago. In experiments at SACLA, the Japanese X-ray laser, and at the European Synchrotron Radiation Facility ESRF in France, the group led by Aleksandr Chumakov from ESRF could show a dramatic reduction in the time to emit the first X-ray ...

22 December 2017

“X-ray streaking” allows ultrafast processes to be followed using a single pulse of light

An international team of scientists has developed a new experimental method at the FLASH X-ray laser which allows the sequence of events involved in a process to be observed using a single, ultrashort pulse of light from FLASH. Their method is called “X-ray streaking” and enables researchers to observe ultrafast processes continuously, instead of being confined to taking snapshots at discrete ...

30 May 2017

Scientists demonstrate unparalleled phase control of free-electron laser pulses

Thanks to a smart mirror scientists can control the phase of X-rays from DESY's free-electron laser FLASH with attosecond precision. The feat enables new investigations of the interactions of light and matter, as the team headed by DESY scientist Tim Laarmann reports in the journal Nature Communications. An attosecond is a billionth of a billionth of a second. The phase indicates at which ...