Optics Express · 2010 · 166 citations · 23 references
We report on the generation of impulsive terahertz (THz) radiation with 36 kV/cm vacuum electric field (1.5 mW average thermal power) at 250 kHz repetition rate and a high NIR-to-THz conversion efficiency of 2 x 10(-3). This is achieved by photoexciting biased large-area photoconductive emitter with NIR fs pulses of microJ pulse energy. We demonstrate focussing of the THz beam by tailoring the pulse front of the exciting laser beam without any focussing element for the THz beam. A high dynamic range of 10(4) signal-to-noise is obtained with an amplifier based system.
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Generation of 10μJ ultrashort terahertz pulses by optical rectification
Ka-Lo Yeh, Matthias C. Hoffmann, János Hebling et al. · Applied Physics Letters · 2007 · 586 citations
Generation of single-cycle THz transients with high electric-field amplitudes
T. Bartel, P. Gaal, K. Reimann et al. · Optics Letters · 2005 · 465 citations