Links
infrared free electron laser - FELIX
soft x-ray free electron laser - FLASH
DESY
ASTeC / STFC Daresbury Laboratory
FOM Institute for Plasma Physics Rijnhuizen
FOM, the foundation for fundamental research on matter (physics division NWO)
Cavity Ring-Down Spectroscopy: Techniques and Applications (book published by Wiley)
Cavity Ring-Down Spectroscopy (Wikipedia)