Kerr self-cleaning of pulsed beam in an ytterbium doped multimode fiber

Guenard, R.; Krupa, Katarzyna; Dupiol, R.; Fabert, Marc; Bendahmane, Abdelkrim; Kermène, Vincent; Desfarges‐Berthelemot, Agnès; Auguste, Jean‐Louis; Tonello, Alessandro; Barthélémy, Alain; Millot, Guy; Wabnitz, Stefan; Couderc, Vincent

doi:10.1364/oe.25.004783

Cited by 93 publications

(57 citation statements)

References 29 publications

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“…These findings are of great importance for the design of high power fiber amplifiers [15] and mode-locked lasers [16,17] based on MMFs, and their technological applications. The experimentally observed spatial beam reshaping into a quasi-fundamental mode of the nonlinear multimode fiber, accompanied by temporal pulse compression, is analogous to the discrete spatiotemporal focusing and compression, which occurs with pulses propagating in multicore optical fibers [18][19][20].…”

Section: Introductionmentioning

confidence: 81%

Spatiotemporal light-beam compression from nonlinear mode coupling

et al. 2018

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We experimentally demonstrate simultaneous spatial and temporal compression in the propagation of light pulses in multimode nonlinear optical fibers. We reveal that the spatial beam self-cleaning recently discovered in graded-index multimode fibers is accompanied by significant temporal reshaping and up to four-fold shortening of the injected sub-nanosecond laser pulses. Since the nonlinear coupling among the modes strongly depends on the instantaneous power, we explore the entire range of the nonlinear dynamics with a single optical pulse, where the optical power is continuously varied across the pulse profile.

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Section: Introductionmentioning

confidence: 81%

Spatiotemporal light-beam compression from nonlinear mode coupling

et al. 2018

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“…In particular, graded-index multimode fibers (GRIN MMFs), thanks to their reduced modal dispersion which permits relatively long interaction lengths among the guided modes, were found to host a rich variety of spatiotemporal dynamical effects [1][2][3]. Among these, we may cite multimode solitons [4], ultra-wideband spectral sideband series generation from either oscillating multimode solitons [1,5] or quasi continuous-wave (CW) pulses (also known as geometric parametric instability, GPI) [6][7][8][9], intermodal four-wave mixing (IMFWM) [10,11], beam self-cleaning in passive [7,8,12,13] and active MMFs [14], supercontinuum generation [15,16], spatio-temporal mode-locking [17,18], and wavefront shaping control of frequency conversion processes [19], to name a few.…”

Section: Introductionmentioning

confidence: 99%

Refractive index profile tailoring of multimode optical fibers for the spatial and spectral shaping of parametric sidebands

Krupa¹,

Couderc²,

Tonello³

et al. 2019

J. Opt. Soc. Am. B

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We introduce the concept of spatial and spectral control of nonlinear parametric sidebands in multimode optical fibers by tailoring their linear refractive index profile. In all cases, the pump experiences Kerr self-cleaning, leading to a bell-shaped profile close to the fundamental mode. Geometric parametric instability, owing to quasi-phase-matching from the grating generated via the Kerr effect by pump self-imaging, leads to frequency multicasting of beam self-cleaning across a wideband array of sidebands. Our experiments show that introducing a gaussian dip in the refractive index profile of a graded index fiber permits to dramatically change the spatial content of spectral sidebands into higher-order modes. This is due to the breaking of oscillation synchronism among fundamental and higher-order modes. Hence modal-four-wave mixing prevails over geometric parametric instability as the main sideband generation mechanism. Observations agree well with theoretical predictions based on a perturbative analysis, and with full numerical solutions of the (3D + 1) nonlinear Schrödinger equation.

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“…Spatial beam self-cleaning is enhanced in active fiber amplifiers, thus it is expected to provide a key building block for a new class of high power fiber lasers. 9,21…”

Section: Discussionmentioning

confidence: 99%

Nonlinear dynamics in multimode optical fibers

Wabnitz¹,

Tonello²,

Couderc³

et al. 2018

Quantum Sensing and Nano Electronics and Photonics XV

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We overview recent advances in the research on spatiotemporal beam shaping in nonlinear multimode optical fibers. An intense light beam coupled to a graded index (GRIN) highly multimode fiber undergoes a series of complex nonlinear processes when its power grows larger. Among them, the lowest threshold effect is the Kerr-induced beam self-cleaning, that redistributes most of the beam energy into a robust bell-shaped beam close to the fundamental mode. At higher powers a series of spectral sidebands is generated, thanks to the phase matching induced by the long period grating due to the periodic self-imaging of the beam and the Kerr effect. Subsequently a broadband and spectrally flat supercontinuum is generated, extending from the visible to the mid-infrared.

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Kerr self-cleaning of pulsed beam in an ytterbium doped multimode fiber

Cited by 93 publications

References 29 publications

Spatiotemporal light-beam compression from nonlinear mode coupling

Spatiotemporal light-beam compression from nonlinear mode coupling

Refractive index profile tailoring of multimode optical fibers for the spatial and spectral shaping of parametric sidebands

Nonlinear dynamics in multimode optical fibers

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