We experimentally demonstrate spatial beam self-cleaning and supercontinuum generation in a tapered Ytterbium-doped multimode optical fiber with parabolic core refractive index profile when 1064 nm pulsed beams propagate from wider (122 µm) into smaller (37 µm) diameter. In the passive mode, increasing the input beam peak power above 20 kW leads to a bell-shaped output beam profile. In the active configuration, gain from the pump laser diode permits to combine beam self-cleaning with supercontinuum generation between 520-2600 nm. By taper cut-back, we observed that the dissipative landscape, i.e., a non-monotonic variation of the average beam power along the MMF, leads to modal transitions of self-cleaned beams along the taper length.

Spatial beam self-cleaning and supercontinuum generation with Yb-doped multimode graded-index fiber taper based on accelerating self-imaging and dissipative landscape / Niang, A.; Mansuryan, T.; Krupa, K.; Tonello, A.; Fabert, M.; Leproux, P.; Modotto, D.; Egorova, O. N.; Levchenko, A. E.; Lipatov, D. S.; Semjonov, S. L.; Millot, G.; Couderc, V.; Wabnitz, S.. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 27:17(2019), pp. 24018-24028. [10.1364/OE.27.024018]

Spatial beam self-cleaning and supercontinuum generation with Yb-doped multimode graded-index fiber taper based on accelerating self-imaging and dissipative landscape

Wabnitz, S.
Ultimo
Writing – Original Draft Preparation
2019

Abstract

We experimentally demonstrate spatial beam self-cleaning and supercontinuum generation in a tapered Ytterbium-doped multimode optical fiber with parabolic core refractive index profile when 1064 nm pulsed beams propagate from wider (122 µm) into smaller (37 µm) diameter. In the passive mode, increasing the input beam peak power above 20 kW leads to a bell-shaped output beam profile. In the active configuration, gain from the pump laser diode permits to combine beam self-cleaning with supercontinuum generation between 520-2600 nm. By taper cut-back, we observed that the dissipative landscape, i.e., a non-monotonic variation of the average beam power along the MMF, leads to modal transitions of self-cleaned beams along the taper length.
2019
nonlinear optics; optical fibers; Kerr effect
01 Pubblicazione su rivista::01a Articolo in rivista
Spatial beam self-cleaning and supercontinuum generation with Yb-doped multimode graded-index fiber taper based on accelerating self-imaging and dissipative landscape / Niang, A.; Mansuryan, T.; Krupa, K.; Tonello, A.; Fabert, M.; Leproux, P.; Modotto, D.; Egorova, O. N.; Levchenko, A. E.; Lipatov, D. S.; Semjonov, S. L.; Millot, G.; Couderc, V.; Wabnitz, S.. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 27:17(2019), pp. 24018-24028. [10.1364/OE.27.024018]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1306294
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