The first atomic X-ray laser https://www.mpg.de/5004069/first_atomic_xray_laser?page=2
The first atomic X-ray laser emits extremely short and bright X-ray pulses. The atomic laser is pumped with a free-electron laser and was created by Nina Rohringer from the Max Planck Advanced Study Group (CFEL) with the SCLS at SLAC.
For more information on CFEL please visit the Center’s website at http://www.cfel.de