Weak beam self-cleaning of femtosecond pulses in the anomalous dispersion regime
Yuhang Wu, Hamed Pourbeyram, Demetrios N. Christodoulides, Frank W. Wise
Abstract
Kerr beam cleaning in graded-index multimode fiber has been investigated in experiments with sub-nanosecond pulses and in experiments with femtosecond pulses at wavelengths where the dispersion is normal. We report a theoretical and experimental study of this effect with femtosecond pulses and anomalous dispersion. In this regime, only weak beam cleaning is observed experimentally, along with strong temporal evolution of the pulse. Numerical simulations exhibit the qualitative trends of the experiments.
Topics & Concepts
FemtosecondOpticsDispersion (optics)Materials scienceMulti-mode optical fiberNanosecondSelf-focusingSelf-phase modulationBeam (structure)WavelengthPulse (music)Kerr effectFemtosecond pulse shapingNonlinear opticsOptical fiberLaserPhysicsLaser beamsQuantum mechanicsNonlinear systemDetectorLaser-Matter Interactions and ApplicationsAdvanced Fiber Laser TechnologiesPhotonic Crystal and Fiber Optics