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We generate ultrafast magneto-photocurrents in bulk GaAs and non-invasively separate surface and bulk contributions to the overall current. This method enables the investigation of processes such as anisotropic-distribution relaxation and the inverse Spin Hall effect.
We study THz radiation from magneto-optically induced ultrafast currents in GaAs. Magnetic field and excitation intensity are found to have a distinct influence on the shape of the THz traces. The results suggest that these currents are an appropriate tool to investigate k-space carrier dynamics in semiconductors.
We study THz emission from magneto-optically induced ultrafast photocurrents in a GaAs crystal. Analyzing currents appearing in the direction of the externally applied magnetic field, we observe different current dynamics for linearly- and circularly-polarized excitation.
High power pump modules are used for industrial as well as telecom applications such as for fiber lasers and cladding pumped erbium doped fiber amplifiers (EDFA) [Lichtenstein, N., et al., 2004]. Key element of a pump module is a single emitter laser diode, which normally has an aperture of around 90 mum, in order to provide best coupling into an optical multi-mode fiber with a 105 mum core diameter...
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