Spatial beam self-cleaning in tapered Yb-doped GRIN multimode fiber with decelerating nonlinearity

Abstract

We experimentally demonstrate spatial beam self-cleaning in an Yb-doped graded-index multimode fiber taper, both in passive and active configurations. The input laser beam at 1064 nm was injected for propagation from the small to the large core side of the taper, with laser diode pumping in a counterdirectional configuration. The Kerr effect permits to obtain high-beam quality amplification with no accompanying frequency conversions. As a result, our nonlinear taper amplifier may provide an important building block for multimode fiber lasers and amplifiers.

References in corpus (5)

• Space Division Multiplexing in Optical Fibres
• Spatial beam self-cleaning in multimode fiber
• Observation of geometric parametric instability induced by the periodic spatial self-imaging of multimode waves
• Self-organized instability in graded-index multimode fibres
• Spatiotemporal Characterization of Supercontinuum Extending from the Visible to the Mid-Infrared in Multimode Graded-Index Optical Fiber