Multimode Optical Fiber Beam-By-Beam Cleanup

Ferraro, Mario; Mangini, Fabio; Leventoux, Yann; Tonello, Alessandro; Zitelli, Mario; Mansuryan, Tigran; Sun, Yifan; Fevrier, Sébastien; Krupa, Katarzyna; Kharenko, D. S.; Wabnitz, Stefan; Couderc, Vincent

doi:10.1109/jlt.2023.3239385

Cited by 9 publications

(5 citation statements)

References 45 publications

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“…In this sense, although early works have shown that the state of polarization may drastically change during BSC [32], here we did not analyze the role of light polarization during BSC in a thermodynamic framework. Preliminary results in this regard may be found in Ferraro et al [33].…”

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confidence: 83%

“…The value of the index j for each mode is overlapped to its pattern. (c) Three spatial phase distributions for the first ten modes., (d) Corresponding output beam intensities, using amplitudes A j in (a) and L = 3 m. The beam quality, measured via the correlation between the intensity of the fundamental beam and that of near-field images [26], is 85% (green), 91% (blue), and 97% (red), respectively.…”

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confidence: 99%

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Modal phase-locking in multimode nonlinear optical fibers

et al. 2023

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Spatial beam self-cleaning, a manifestation of the Kerr effect in graded-index multimode fibers, involves a nonlinear transfer of power among modes, which leads to robust bell-shaped output beams. The resulting mode power distribution can be described by statistical mechanics arguments. Although the spatial coherence of the output beam was experimentally demonstrated, there is no direct study of modal phase evolutions. Based on a holographic mode decomposition method, we reveal that nonlinear spatial phase-locking occurs between the fundamental and its neighboring low-order modes, in agreement with theoretical predictions. As such, our results dispel the current belief that the spatial beam self-cleaning effect is the mere result of a wave thermalization process.

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confidence: 83%

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confidence: 99%

Modal phase-locking in multimode nonlinear optical fibers

et al. 2023

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“…1b. This indicates that the effect may enable efficient coherent combining of different intense laser beams with the same carrier wavelength but highly different beam quality, leading to a combined high-quality beam [4].…”

Section: 𝐶𝑜𝑟 =mentioning

confidence: 99%

“…The value of 𝑃 𝑐 varies with the laser-fibre coupling conditions. In particular, it has been shown that on-axis coupling favours BSC, whereas beams injected into the fibre with a tilted angle (𝜃) require higher powers to trigger BSC [4]. Moreover, for 𝜃 ≠ 0, injections with an off-set with respect to the fibre axis provide the beam with a transverse orbital angular momentum, which may hinder BSC [5].…”

Section: Introductionmentioning

confidence: 99%

Beam-by-beam Kerr clean-up in multimode optical fibres – INVITED

Ferraro,

Mangini,

Leventoux

et al. 2023

EPJ Web Conf.

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We propose and demonstrate the concept of beam-by-beam cleaning in multimode optical fibres, i.e., the increase of the spatial quality of an intense laser beam, induced by a relatively weak, quasi singlemode seed beam. This effect, which relies on the Kerr nonlinearity of the fibre, is quite efficient: a seed beam is capable of providing a bell-shape to a ten times more powerful beam. Our results pave the way for the development of a new class of all-optical switching devices for intense laser beams.

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“…The coupling of the two pulses can be due to ionization or Kerr effect. In particular, a main pulse can be controlled by a much weaker pulse due to cross-phase modulation [26,27] or quantum interference [25], allowing a practical all-optical control of a powerful beam.…”

Section: Introductionmentioning

confidence: 99%

Control of Spatiotemporal Localization of Infrared Pulses in Gas-Filled Capillaries Using Weak Ultraviolet Pulses

Han,

Gao

2023

Photonics

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Manipulation of intense pulse propagation in gas-filled capillaries is desirable for various high-field applications. Tuning the parameters of the driving laser pulse and the working gas is the conventional approach, and it provides limited capability of control. Here we demonstrate through numerical simulations a practical scheme to control the propagation of intense pulses. A weak ultraviolet pulse is launched into a capillary with a negative delay with respect to a main infrared pulse. The pulses begin to temporally overlap due to dispersion. As the main pulse self-compresses, the control pulse is strongly red-shifted due to cross-phase modulation. The frequency shifts of the two pulses mitigate pulse walk-off and allow an efficient coupling, substantially extending the effective interaction length. This interesting phenomenon may benefit applications such as high-order harmonic generation.

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Multimode Optical Fiber Beam-By-Beam Cleanup

Cited by 9 publications

References 45 publications

Modal phase-locking in multimode nonlinear optical fibers

Modal phase-locking in multimode nonlinear optical fibers

Beam-by-beam Kerr clean-up in multimode optical fibres – INVITED

Control of Spatiotemporal Localization of Infrared Pulses in Gas-Filled Capillaries Using Weak Ultraviolet Pulses

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