Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster II

Q 55.81: Poster

Thursday, March 11, 2010, 16:00–19:00, Lichthof

THz generation via optical rectification in GaAs and GaP — •Jan-Philipp Negel, Robin Hegenbarth, Andy Steinmann, Bernd Metzger, Felix Hoos, and Harald Giessen — 4th Physics Institute, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany

We develop a compact, high-power and low-cost THz source using optical rectification in GaAs and GaP. We use a home-built 5 W, 230 fs, 1025 nm, 44 MHz Yb:KGW laser as well as a commercial 3 W, sub-500 fs, 1035 nm, 37 MHz fiber laser as the pump source for optical rectification in GaP. Alternatively, GaAs with a much higher electro-optic coefficient is used. In order to avoid two-photon absorption in the GaAs, which would lead to a high THz absorption in the crystal, we use an OPO having a tunable signal wavelength up to 1.9 µm. We expect broadband, ultrashort THz radiation centered around 1 THz and output powers of a few µW. We demonstrate scaling up of the power even further.