Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 21: Poster I

Q 21.76: Poster

Dienstag, 9. März 2010, 16:00–19:00, Lichthof

Towards a multi-Watt femtosecond optical parametric oscillator tunable between 1.5 µm and 1.9 µm wavelength — •Robin Hegenbarth¹, Jan-Philipp Negel¹, Felix Hoos¹, Bernd Metzger¹, Andy Steinmann¹, János Hebling², and Harald Giessen¹ — ¹4th Physics Institute, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany — ²Department of Experimental Physics, University of Pécs, Ifjúság út 6, H-7624 Pécs, Hungary

We develop a cost-effective, synchronously pumped singly resonant optical parametric oscillator (OPO) tunable between 1.5 µm and 1.9 µm signal wavelength. We expect up to 40 percent conversion efficiency and <200 fs FWHM pulse duration. The OPO signal is generated in an MgO-doped periodically poled lithium niobate (MgO:PPLN) crystal. The pump source is a fiber laser with 1030 nm wavelength, 3 W average output power, <500 fs FWHM pulse duration, and 37 MHz repetition rate. We also use a 5 W average output power Yb:KGW laser as pump source, which scales up the OPO’s signal power even more. This OPO will be used as a pump source of a Mid-IR optical parametric oscillator with several hundred mW average output power tunable between 5 µm and 12 µm wavelength with AgGaSe₂ as a nonlinear crystal. Another application is the generation of terahertz radiation via optical rectification in GaAs.