Kavli Affiliate: Frank W. Wise
| First 5 Authors: Varun Sharma, Varun Sharma, , ,
| Summary:
While nonlinear effects in graded-index (GRIN) multimode fibers have been
studied extensively, little is known about nonlinear effects in larger GRIN
waveguides, where the number of modes approaches infinity and modal dispersion
becomes negligible. Here we show that Gaussian beams remain nearly invariant
even with large nonlinear phase accumulation and on- or off-axis trajectories
in GRIN rods. In addition, spatially-complex beams can undergo self-cleaning to
single-lobed profiles for both on- and off-axis trajectories. Numerical
simulations exhibit the features observed in experiments, and a general
interpretation of these results that makes connection to beam-cleaning
phenomena observed in GRIN fibers is proposed.
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