Experimental investigations on nonlinear dynamics in supercontinuum generation with feedback

Abstract

A system for supercontinuum generation by using a photonic crystal fiber within a synchronously pumped ring cavity is presented. The feedback led to an interaction of the generated supercontinuum with the following femtosecond laser pulses and thus to the formation of a nonlinear oscillator. The nonlinear dynamical behavior of this system was investigated experimentally and compared with numerical simulations. Steady state, period doubling and higher order multiplication of the repetition rate as well as limit cycle and chaotic behavior were observed in the supercontinuum generating system.

Influence of pump power and modulation instability gain spectrum on seeded supercontinuum and rogue wave generation

“…The concept of GV matching has been used to show how the spectra can be extended into the deepblue by optimizing the fiber structure [3], by tapering the fiber [4][5][6], or by doping the fiber [7]. Other ways of pushing the spectrum toward the blue include seeding with the second harmonic [8], using concatenated fibers [9], or back-seeding part of the SC [10][11][12].…”

The role of phase coherence in seeded supercontinuum generation

“…For such lasers the pulse breakup is initiated by noise-driven modulational instability (MI), which causes large shot-to-shot fluctuations. It has been demonstrated that the noise can be significantly reduced by modulating the pump pulse in order to ensure a deterministic rather than noise-driven pulse breakup [3][4][5][6][7][8][9][10][11]. Seeding was numerically investigated in [5,6,10,11].…”

“…In all cases a phase coherent seed was used to achieve a coherent pulse break-up through the amplification of a cascade of four-wave mixing (FWM) side-bands. Experimentally, seeding was investigated in [3,4,[7][8][9]. In [3,8,9] the seed was used to trigger sub-threshold SC generation.…”

“…It is thus fair to assume that the seeds in [3,8,9] were at least partially coherent with the pump. In [4,7] the generated SC from one pulse was used as a broadband seed for the following pulse either by back-seeding or using a ring cavity. SC generation with feedback is however dynamically different from the approach used in this work, where the pump pulse is modulated with a seed as in [3,5,6,[8][9][10][11].…”

Enhanced supercontinuum generation in highly nonlinear fibre by selected feedback seeding

“…For example, by adding an external seed light or by modulating the pump pulse envelopes [3][4][5]. A different approach is to utilize a feedback to influence the SC generation, where a fraction of the generated SC was used as a seed for the following pump pulse [6][7][8]. But until now, control of the SC generation and its properties still remains a big challenge.…”