The FELBE FELs are the only FELs in Europe providing ultrashort pulses at a continuous high repetition rate (13 MHz). The two FELs of FELBE provide continuous tunability over a spectral range of 5 µm - 250 µm (U37 : 5 µm - 40 µm, U100 : 20 µm - 250 µm) with a bandwidth of ~0.4 - 3% and a maximum average power up to tens of Watts, corresponding to pulse energies of a few µJ. The ultrashort pulsewidth scales with the wavelength, ranging from sub-ps to a few tens of ps, resulting in a maximum peak power within each pulse of ~ 1 MW and fields up to MV/cm. The high repetition rate (13 MHz) and high average power enable exceptional signal-to-noise and data statistics, but additional time structures such as a macropulse (burst) mode or lower repetition rates by pulse-picking are also available.
The FELBE FEL beam is directed into several user labs equiped with a wide range of instrumentation and synchronized tabletop sources for time-resolved and nanoscale measurements in specialized sample environments (e.g. pump-probe, s-SNOM, low-temperature, etc.). Measurements in high magnetic fields are also possible in both static fields up to 7 T or with the worlwide unique experimental capability of the FELBE FEL beamline extending to a pulsed magnetic field up to 70 T (in 100+ ms pulses) in the Dresden High Magnetic Field Laboratory (HLD).