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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik
Q 15.1: Poster
Monday, March 14, 2011, 16:30–19:30, P1
Characterization of THz generation by ionizing two-color pulses — •Christian Koehler1, Eduardo Cabrera1, Ihar Babushkin2, Joachim Herrmann3, and Stefan Skupin1,4 — 1Max-Planck-Institute for the Physics of Complex Systems, Dresden, Germany — 2Weierstraß-Institut für Angewandte Analysis und Stochastik, Berlin, Germany — 3Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Berlin, Germany — 4Friedrich-Schiller-University, Institute of Condensed Matter Theory and Solid State Optics, Jena, Germany
We present a theoretical and numerical investigation of the mechanisms responsible for the THz generation by ionizing two-color laser pulses. In that setup, a laser pulse containing a fundamental and its second harmonic frequency is focused into a gas, where the generated electrons are accelerated by the laser field and thus build up a current. That current in turn partly radiates in the THz range. To elucidate the underlying processes, numerical simulations using Forward Maxwell as well as Finite Difference Time Domain schemes are used and supported by analytical calculations. We explain how angularly resolved THz spectra depend on laser pump frequencies, phase relation between fundamental and second harmonic, and the plasma geometry.