Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 29: Laserentwicklung: Nichtlineare Effekte 1
Q 29.8: Vortrag
Mittwoch, 16. März 2011, 12:15–12:30, SCH 251
1.5 W Output Two-Color Femtosecond Optical Parametric Oscillator Pumped by a 7.4 W Femtosecond Yb:KGW Laser — •Robin Hegenbarth1, 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 developed a singly resonant optical parametric oscillator synchronously pumped by an Yb:KGW laser. The OPO signal was generated in a 1 mm long MgO-doped periodically poled congruent lithium niobate (MgO:cPPLN) crystal. With 7.4 W average pump power, 42 MHz repetition rate, and 530 fs FWHM pump pulse duration we were able to achieve more than 1 W in several wavelength regions between 1445 and 1880 nm wavelength with FWHM pulse durations shorter than 600 fs. In particular, we achieved up to 1.5 W using 60 % output coupling rate. A peak in conversion efficiency could be observed at approximately 3 to 5 times threshold pump power. At higher pump power levels conversion efficiency was decreasing. Two-color operation occurred when the OPO was operated close to the point at which total cavity GDD was equal to zero. Due to large signal bandwidth and due to the fact that identical group delay occurred at two wavelengths, oscillation at two wavelengths was possible. This can be used for efficient difference frequency generation into the mid-IR region.