Hamburg 2009 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 10: Ultrakurze Pulse: Erzeugung I

Q 10.1: Vortrag

Montag, 2. März 2009, 14:00–14:15, VMP 8 R206

Effect of feedback on femtosecond supercontinuum generation: numerical investigation on nonlinear dynamics — •Michael Kues, Nicoletta Brauckmann, Till Walbaum, Petra Groß, and Carsten Fallnich — Institut für Angewandte Physik Westfälische Wilhelms-Universität, Münster, Deutschland

Since the development of photonic crystal fibers (PCFs), numerous investigations have been made to improve the phase stability and coherence of supercontinua generated in PCFs. As a possible method to achieve this goal, we investigate the effect of feedback on supercontinuum (SC) generation in PCFs. For this, we numerically study the supercontinuum evolution in a ring cavity synchronously pumped with fs-pulses from a titanium:sapphire laser. The generalized nonlinear Schrödinger equation is solved numerically using a split-step Fourier algorithm, and feedback is employed by superimposing the calculated SC with the following pump pulses. Here, we present results of these simulations, which exhibit a strong influence of feedback on the SC evolution. Depending on input parameters, a convergence of consecutive SC spectra to a steady state can be observed, as well as period doubling, limit cycles, and chaos. Finally, we include noise in our simulations in order to pave the way for an experimental demonstration. From these results, we expect a parameter range where the phase stability as well as the coherence should be improved.