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We experimentally demonstrate spatial beam self-cleaning and supercontinuumgeneration in a tapered Ytterbium-doped multimode optical fiber with paraboliccore refractive index and doping profile when 1064 nm pulsed beams propagatefrom wider (120 micrometers) into smaller (40 micrometers) diameter. In thepassive mode, increasing the input beam peak power above 20 kW leads to abell-shaped output beam profile. In the active configuration, gain from thepump laser diode permits to combine beam self-cleaning with supercontinuumgeneration between 520-2600 nm. By taper cut-back, we observed that thedissipative landscape i.e., a non-monotonic variation of the average beam poweralong the MMF leads to modal transitions of self-cleaned beams along the taperlength.

optics express

Spatial Beam Self-Cleaning and Supercontinuum Generation with Yb-doped  Multimode Graded-Index Fiber Taper Based on Accelerating Self-Imaging and  Dissipative Landscape