Kerr beam self-cleaning on the $LP_{11}$ mode in graded-index multimode fiber

A. Barth\'el\'emy; A. Desfarges-Berthelemot; A. Tonello; E. Deliancourt; G. Millot; K. Krupa; M. Fabert; S. Wabnitz; V. Couderc; V. Kermene

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Kerr beam self-cleaning on the $LP_{11}$ mode in graded-index multimode fiber

E. Deliancourt, M. Fabert, A. Tonello, K. Krupa, A. Desfarges-Berthelemot, V. Kermene, G. Millot, A. Barthélémy

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S. Wabnitz, V. Couderc

Optics · Submitted 2 Jul 2018

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We report the experimental observation of Kerr beam self-cleaning in a graded-index multimode fiber, leading to output beam profiles different from a bell shape, close to the $LP_{01}$ mode.

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arXiv ID1807.00563 (version 2)

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CitationA. Barth\'el\'emy, A. Desfarges-Berthelemot, A. Tonello, E. Deliancourt, G. Millot, K. Krupa, M. Fabert, S. Wabnitz, V. Couderc, V. Kermene. "Kerr beam self-cleaning on the $LP_{11}$ mode in graded-index multimode fiber." arXiv:1807.00563 (2018). https://pith.science/paper/7FJOTTMK

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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 3,692 input tokens.

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We report the experimental observation of Kerr beam self-cleaning in a graded-index multimode fiber, leading to output beam profiles different from a bell shape, close to the $LP_{01}$ mode. For specific coupling conditions, nonlinear coupling among the guided modes can reshape the output speckle pattern generated by a pulsed beam into the low order $LP_{11}$ mode. This was observed in a few meters long multimode fiber with 750 ps pulses at 1064 nm in the normal dispersion regime. The power threshold for $LP_{11}$ mode self-cleaning was about three times larger than that required for Kerr nonlinear self- cleaning into the $LP_{01}$ mode.

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#	sentence	role	the authors' own work	states the main conclusion	strength
s0	We report the experimental observation of Kerr beam self-cleaning in a graded-index multimode fiber, leading to output beam profiles different from a bell shape, close to the $LP_{01}$ mode.	result 0.65	0.95	0.65	asserted 1.00
s1	For specific coupling conditions, nonlinear coupling among the guided modes can reshape the output speckle pattern generated by a pulsed beam into the low order $LP_{11}$ mode.	result 0.93	0.79	0.22	asserted 0.65
s2	This was observed in a few meters long multimode fiber with 750 ps pulses at 1064 nm in the normal dispersion regime.	method 0.96	0.89	0.05	asserted 1.00
s3	The power threshold for $LP_{11}$ mode self-cleaning was about three times larger than that required for Kerr nonlinear self- cleaning into the $LP_{01}$ mode.	result 1.00	0.90	0.13	asserted 0.99

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Original abstract

We report the experimental observation of Kerr beam self-cleaning in a graded-index multimode fiber, leading to output beam profiles different from a bell shape, close to the $LP_{01}$ mode. For specific coupling conditions, nonlinear coupling among the guided modes can reshape the output speckle pattern generated by a pulsed beam into the low order $LP_{11}$ mode. This was observed in a few meters long multimode fiber with 750 ps pulses at 1064 nm in the normal dispersion regime. The power threshold for $LP_{11}$ mode self-cleaning was about three times larger than that required for Kerr nonlinear self- cleaning into the $LP_{01}$ mode.

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Note that similar odd-parity beam shapes were also experimentally observed in a more systematic study carried out with the ideal GRIN fibers in Ref. [ref] , and also numerically predicted in Ref. [ref] , in a different context of multimode solitons.

Refractive index profile tailoring of multimode optical fibers for the spatial and spectral shaping of parametric sidebands · Appendix C: Additional experimental results · 0.93

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