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FELBE free-electron laser: Status and application for time resolved spectroscopy experiments

: Winnerl, S.; Stehr, D.; Drachenko, O.; Schneider, H.; Helm, M.; Seidel, W.; Michel, P.; Schneider, S.; Seidel, J.; Grafström, S.; Eng, L.-M.; Roch, T.; Strasser, G.; Maier, T.; Walther, M.


Institute of Electrical and Electronics Engineers -IEEE-:
Joint 31st International Conference on Infrared and Millimeter Waves and 14th International Conference on Terahertz Electronics 2006. Proceedings. Vol.1 : Shanghai, China, 18 - 22 September 2006
Piscataway, NJ: IEEE, 2006
ISBN: 1-4244-0399-5
ISBN: 1-4244-0400-2
International Conference on Infrared and Millimeter Waves (IRMMW) <31, 2006, Shanghai>
International Conference on Terahertz Electronics (THz) <14, 2006, Shanghai>
Conference Paper
Fraunhofer IAF ()

This paper reviews the basic properties of the infrared free-electron laser FELBE at the Forschungszentrum Rossendorf. At present FELBE delivers pulses with typical durations of 0.9-5 ps in the wavelength range 4-22 gm, which soon will be extended to 150 m. Furthermore we report on recent experiments using FELBE, namely the study of phonon resonances in ferroelectric domains using a newly designed scattering scanning near-field optical microscope (s-SNOM), as well as pump-probe spectroscopy on doped semiconductor superlattices. The pump-probe signal reflects, apart from a component due to the bleaching of the interminiband transition, the temperature of the miniband electrons on a picosecond timescale. ©2006 IEEE.