Mode decomposition of multimode optical fiber beams by phase-only spatial light modulator

Gervaziev, Mikhail; Zhdanov, Innokentiy; Kharenko, D. S.; Gonta, V. A.; Volosi, V. M.; Podivilov, E. V.; Babin, Sergey A.; Wabnitz, Stefan

doi:10.1088/1612-202x/abcf27

Cited by 44 publications

(27 citation statements)

References 20 publications

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“…Here, we do not provide details about our MD algorithm, whose full description can be found in Ref. [30].…”

Section: Methodsmentioning

confidence: 99%

Multimode optical fiber beam-by-beam cleanup

Ferraro¹,

Mangini²,

Leventoux³

et al. 2022

Preprint

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We introduce and experimentally demonstrate the concept of all-optical beam switching in graded-index multimode optical fibers. Nonlinear coupling between orthogonally polarized seed and signal beams permits to control the spatial beam quality at the fiber output. Remarkably, we show that even a weak fewmode control beam may substantially enhance the quality of an intense, highly multimode signal beam. We propose a simple geometrical representation of the beam switching operation, whose validity is quantitatively confirmed by the experimental mode decomposition of the output beam. All-optical switching of multimode beams may find important applications in high-power beam delivery and fiber lasers.

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“…Here, we do not provide details about our MD algorithm, whose full description can be found in Ref. [30].…”

Section: Methodsmentioning

confidence: 99%

Multimode optical fiber beam-by-beam cleanup

Ferraro¹,

Mangini²,

Leventoux³

et al. 2022

Preprint

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“…Although different aspects of the MD procedure have been described in the literature, 11,[13][14][15] its practical implementation still remains a rather challenging task. This is because of the presence of some hidden key parameters, such as the picket-fence effect, which are extremely important for obtaining correct results, that is, for successfully reconstructing a multimode laser beam based on the MD results.…”

Section: Mode Decomposition Experimentsmentioning

confidence: 99%

“…The difficulty is worsened by the high sensitivity of the decomposition results with respect to any positioning error. It was shown numerically 11 that a mismatch of a few pixel only can lead to more than 10% relative error in the mode amplitudes, which results in significant visual differences between original and reconstructed beams. In that same paper, we proposed an experimental method that can solve this problem.…”

Section: Point Of Interestmentioning

confidence: 99%

“…10 In this work, we propose and apply the MD with phase-only SLM digital holography generation to the study of the Kerr beam self-cleaning effect. 11 The impact of the phase-mask size, and of the true meaning point search procedure are among the several crucial factors that affect the accuracy of the MD procedure, and they will be discussed in details in our presentation. This permits us to successfully demonstrate the application of our MD method to characterize the effect of beam self-cleaning, by studying the evolution of the output distribution of mode energies as the input power grows larger.…”

Section: Introductionmentioning

confidence: 99%

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Mode decomposition of Kerr self-cleaned beams by phase only SLM

Kharenko

Gervaziev

Zhdanov

et al. 2021

Real-Time Measurements, Rogue Phenomena, and Single-Shot Applications VI

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Graded-index multimode optical fibers have recently attracted a renewed attention, thanks to the discovery of new nonlinear effects, such as Kerr beam self-cleaning. In essence, Kerr self-cleaning involves a flow of the propagating beam energy into the fundamental mode of the fiber, accompanied by a redistribution of the remaining energy among high-order modes. Increasing the fundamental mode energy leads to a significant improvement of the output beam quality. A standard method to determine beam quality is to measure the M 2 parameter. However, since self-cleaning involves the nonlinear redistribution of energy among a large number of fiber modes, measuring a single beam quality parameter is not sufficient to characterize the effect. A properly informative approach requires performing the mode decomposition of the output beam. Mode decomposition permits to evaluate the energy distribution among all of the excited fiber modes, which enables investigations of nonlinear mode coupling processes at a qualitatively new level. In this work, we demonstrate an efficiency mode decomposition method based on holography, which is suitable for analyzing the self-cleaning effect. In a theoretical study, we describe the solution of the mode decomposition problem for the modes of the gradedindex multimode fiber. In an experimental investigation, we demonstrate the decomposition of both low-power (speckled) and self-cleaned beams, involving more than 80 modes.

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“…Finally, we carried out an experimental characterization of the thermal mode distribution at the fiber output, based on a holographic mode decomposition (MD) technique. The MD was performed by means of a phase-only spatial light modulator (SLM) [26]. In our implementation, OAM is imparted to an input Gaussian laser beam by means of properly adjusting its coupling condition into the fiber [27].…”

mentioning

confidence: 99%

Thermalization of orbital angular momentum beams in multimode optical fibers

Podivilov,

Mangini,

Sidelnikov

et al. 2021

Preprint

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We present a general theory of thermalization of light in multimode optical fibers, including optical beams with nonzero orbital angular momentum or vortex beams. A generalized Rayleigh-Jeans distribution of asymptotic mode composition is obtained, based on the conservation of the angular momentum. We confirm our predictions by numerical simulations and experiments based on holographic mode decomposition of multimode beams. This establishes new constraints for the achievement of spatial beam self-cleaning, giving previously unforeseen insights into the underlying physical mechanisms.

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Mode decomposition of multimode optical fiber beams by phase-only spatial light modulator

Cited by 44 publications

References 20 publications

Multimode optical fiber beam-by-beam cleanup

Multimode optical fiber beam-by-beam cleanup

Mode decomposition of Kerr self-cleaned beams by phase only SLM

Thermalization of orbital angular momentum beams in multimode optical fibers

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