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 LP01 mode. For specific light injection conditions, nonlinear coupling among the guided modes can reshape the output speckle pattern generated by a pulsed beam into the low order LP11 mode. This effect 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 LP11 mode self-cleaning was about three times larger than that required for Kerr nonlinear self-cleaning into the LP01 mode.
Kerr beam self-cleaning on the LP11 mode in graded-index multimode fibers / Deliancourt, E.; Fabert, M.; Tonello, A.; Krupa, K.; Desfarges-Berthelemot, A.; Kermene, V.; Millot, G.; Barthélémy, A.; Wabnitz, S.; Couderc, V.. - In: OSA CONTINUUM. - ISSN 2578-7519. - 2:4(2019), pp. 1089-1096. [10.1364/OSAC.2.001089]
Kerr beam self-cleaning on the LP11 mode in graded-index multimode fibers
Wabnitz, S.;
2019
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 LP01 mode. For specific light injection conditions, nonlinear coupling among the guided modes can reshape the output speckle pattern generated by a pulsed beam into the low order LP11 mode. This effect 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 LP11 mode self-cleaning was about three times larger than that required for Kerr nonlinear self-cleaning into the LP01 mode.| File | Dimensione | Formato | |
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