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  • Helmholtz-Zentrum Dresden-Rossendorf e.V.
  • Helmholtz-Zentrum Dresden-Rossendorf e.V., Bautzner Landstr. 400
  • 01328 Dresden, Germany
  • Visit FELBE Website »
  • Tel. +49 351 260 2684
  • Fax. +49 351 260 1 2684




  • October 18th, 2017: for projects to be carried out in the 2st semester of 2017.
  • Spring 2018 for projects in the 2nd semester of 2018.


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Operated by the Helmholtz-Zentrum Dresden-Rossendorf e.V. (HZDR) the free-electron-laser facility FELBE provides picosecond infrared pulses. Two free-electron lasers cover the mid- and far-infrared spectral range from 4 - 250 µm. The electron bunches for the FELBE are provided by the superconducting radio-frequency linear accelerator ELBE. FELBE can operate in three different modes: continuous pulsing with a repetition rate of 13 MHz, pulsing with 1 kHz by applying a pulse picker, and macrobunch operation with bunch length > 100 µs and macrobunch repetition rates ≤ 25 Hz. Pulse duration and pulse energy vary with wavelength and lie in the range from 1 -25 ps and 100 nJ - few µJ, respectively. The user labs at FELBE are equipped mainly for time-resolved spectroscopy. Various tabletop near-infrared and THz sources can be synchronized to FELBE and setups exist for single-colour and two-colour pump-probe experiments, time-resolved photoluminescence measurements, near-field spectroscopy and Fourier-transform infrared spectroscopy. Samples can be studied in a 8 T split-coil magnet with optical access. Furthermore FELBE is linked to the Dresden High Magnetic Field Laboratory, which enables infrared spectroscopy in pulsed magnetic fields up to 85 T (150 ms magnetic pulse duration).

FEL modeTEM_00
PolarisationLV, LH for all energies; for energies > 60meV and few selected others: LC, RC
Spectral range [μm]4-250
Photon energy fluctuations [rms]< 2 x 10-3 of central photon energy
FEL bandwidth DE/E [rms]Fourier-transform limited operation. By cavity detuning FEL bandwidth can be changed from 0.3 - 1.6% (FWHM), 0.1 - 0.7 % rms
FEL bandwidth fluctuations [rms]below 10-4
Tunability [%]Fast tuning (undulator adjustement): 400% for 5 - 62meV, 40% for ph. energy 62 - 310 meV
Repetition rate [Hz]13 MHz, 1kHz; also macrobunch with macrobunch rep. rate ≤ 25 Hz
Estimated pulse lenght [ps]1 - 25
Macropulse lenght [μs]> 100
last update by FELBEFEL on 6/13/2017 12:30:02 PM



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