Preliminary-Results on Short-Pulse High-Power Free-Electron Laser Spectroscopy in N-Gaas

The very short and high power far infrared pulses of the new Dutch Free Electron laser FELIX at the FOM Institute ''Rijnhuizen'' have been used for the first time to perform linear and non-linear spectrscopic experiments in bulk n-GaAs. Preliminary results on a variety of effects observed in the far infrared shallow donor spectrum in an applied magnetic field are reported.