Abstract

We observe a nonlinear spatial self-cleaning process for femtosecond pulses in graded-index (GRIN) multimode fiber (MMF). Pulses with 80 fs duration at 1030 nm are launched into GRIN MMF with 62.5 μm core. The near-field beam profile at the output end of the fiber evolves from a speckled pattern to a centered, bell-shaped transverse structure with increasing pulse energy. The experimental observations agree well with numerical simulations, which show that the Kerr nonlinearity underlies the process. This self-cleaning process may find applications in ultrafast pulse generation and beam-combining.

© 2016 Optical Society of America

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Supplementary Material (5)

NameDescription
» Visualization 1: MP4 (1936 KB)      Linear, different wavelengths.
» Visualization 2: MP4 (4298 KB)      Nonlinear, different wavelengths.
» Visualization 3: MP4 (2897 KB)      Linear, spatial simulation.
» Visualization 4: MP4 (3105 KB)      Nonlinear, spatial simulation.
» Visualization 5: MP4 (7721 KB)      Temporal domain, simulation.

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