Nonlinear dynamics in the supercontinuum generation regime

21.06.2013, 00:00

Newsletter 6

The possibility of improving noise characteristics via feedback has been demonstrated for example in synchronously pumped resonators such as optical parametric oscillators and mode-locked lasers. Using fs pulses to pump a passive ring-cavity containing a nonlinear dispersion-tailored photonic crystal fibre, we have extended this concept to the regime of supercontinuum generation. We have numerically found that the influence of timing-jitter on cavity dynamics increases for shorter pump pulses and becomes dominant for pulse durations below 200 fs. Timing jitter induces a temporal mismatch between the pump pulse and the pulse circulating inside the cavity, strongly affecting the pulse shape emerging from the combining beam-splitter and being more pronounced for shorter pulses. We have verified this phenomenon by experimentally investigating the bifurcation diagram of the system and have also developed an abstract model of this phenomenon, predicting the existence of several different dynamical regimes (such as the stable high periodicity regime shown in the figure). This model also allows for semi-analytical investigations of the cavity dynamics, which could be used to tailor a specific cavity output.

Contact: michael.schmidberger(at)mpl.mpg(dot)de
Group: Russell Division
Reference: M. Schmidberger et al.,  Opt. Lett. 37, 3576–3578 (2012).