Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 48: Ultrashort Laser Pulses: Miscellaneous

Q 48.4: Vortrag

Donnerstag, 11. März 2010, 11:15–11:30, F 342

Phase dependence of supercontinuum generation with optical feedback — •Nicoletta Brauckmann, Michael Kues, Petra Groß, and Carsten Fallnich — Institut für Angewandte Physik, Westfälische Wilhelms-Universität, Münster

Supercontinuum (SC) generation is a nonlinear optical phenomenon where light of narrow bandwidth becomes spectrally broadened due to several nonlinear effects. In addition to the conventional input pulse and fiber parameters we experimentally and numerically investigate the influence of an optical feedback on SC generation. Specifically, a system for SC generation by using a microstructured fiber within a synchronously pumped ring cavity is presented. The feedback leads to an interaction of the generated SC with the following femtosecond laser pulses and thus to the formation of a nonlinear oscillator. Different kinds of nonlinear dynamical behavior can be observed, namely steady state, period multiplication as well as limit cycle and chaotic behavior [1]. Here, we present that the delay of the optical feedback is a critical parameter for the specific shape of the generated SC and for the regime of nonlinear behavior as the system is sensitive to the phase of the feedback. We demonstrate that it is possible to shape supercontinua via the pulse and fiber parameters and to create specific time series like period multiplication via the effect of optical feedback, which might promote novel applications.

[1.] M. Kues, N. Brauckmann, T. Walbaum, P. Groß, and C. Fallnich, Opt. Express 17, 15827–15841 (2009).