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

Abstract

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

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Cited by in corpus (5)

• Spatiotemporal mode-locking in lasers with large modal dispersion
• Optical Phase Transitions in Photonic Networks: A Spin System Formulation
• Controlling Optical Beam Thermalization via Band-Gap Engineering
• Self-cleaning effect in an all-fiber spatiotemporal mode-locked laser based on graded-index multimode fiber
• Weak Langmuir turbulence in disordered multimode optical fibers