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HL: Fachverband Halbleiterphysik

HL 51: Poster IV

HL 51.4: Poster

Donnerstag, 28. Februar 2008, 16:30–19:00, Poster D

Generation of a Single-cycle Terahertz Pulse through Shaped Ultrafast Laser Pulses — •Andreas Vaupel, Kapil Kohli, Sangam Chatterjee, and Wolfgang W. Rühle — Faculty of Physics, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany

We report the generation of a single-cycle terahertz pulse in a free-space terahertz time domain spectroscopy setup. Terahertz-radiation is generated via optical rectification and detected by utilizing the Pockels effect through electro-optical sampling in ZnTe crystals. A 4-f pulse-shaper setup with a spatial light modulator is used to generate two-colour pulses by manipulating the phase in the Fourier plane. We are able to directly control the timing between and the amplitude ratio of the two pulses. A genetic algorithm is used to obtain the best shaped single-cycle terahertz pulse. A flexible setup is presented which enables the generation of various terahertz pulse shapes.