Mechanism of beam cleanup by stimulated Brillouin scattering in multimode fibers

Gao, Qilin; Lü, Zhiwei; Zhu, Chengyu; Zhang, Jianhui

doi:10.7567/apex.8.052501

Cited by 16 publications

(8 citation statements)

References 21 publications

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“…The reason is that the magnitude of the Stokes wave I s (0) entering the fiber in the opposite direction was not recorded in experimental work. Therefore, in experimental works, it is possible to determine whether the data after the points of deviation from the straight line in the results obtained correspond to the SBS effect only by applying G. Agraval's equation (7) as here it is possible to determine all the coefficients and parameters. Since in the selected ( 7), ( 8) and ( 9) mathematical models Brilluen amplification coefficient g B was determined by the equation ( 5) where the value of the average width ∆ʋ B was unknown, since the acoustic wave coefficient P 12 and the input radiation spectrum were not measured.…”

Section: Interpretation Of the Obtained Results By The Methods Of Dir...mentioning

confidence: 99%

“…All the methods described above are taken into account in [7], several methods have been developed to reduce the effects of SBS, each of which affects the SBS threshold by manipulating one of several parameters. These methods fit into several free categories, including increasing the effective area of the mode, expanding the pumping spectrum beyond, the Brillouin gain band, changing the Brillouin gain band along the fiber length.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Modeling the method for determining the stimulated brillouin scattering threshold in a single-mode optical fiber

Zhumazhanov

Zhetpisbayeva

Zhetpisbayev³

et al. 2022

EEJET

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Nonlinear optical effects in optical waveguides play an important role in the development of fiber and integrated optics systems for optical communication and information processing. On the one hand, nonlinear effects impose restrictions on the radiation power that can be transmitted through an optical fiber or light guide. In this paper, the problem of the occurrence of the phenomenon from the stimulated Brillouin scattering (SBS) effect is investigated using two optical sources of rays in a single-mode optical fiber at joint waves of 1310 nm and 1550 nm. Due to the fact that in all trunk fiber-optic lines, the intensity and energy of input signals is limited due to the influence of SBS, methods are currently being sought to reduce the influence of this phenomenon. It was found that the energy of the input beam in the combined propagation of the compound did not reach the value of the threshold of SBS in the values of 25 dBm and 27 dBm due to the discrepancy between the experimental results and the results of the model. The SBS effect was not observed when the threshold threshold of 15 dBm and 27 dBm – SBS was reached when combining a dual beam along a single optical fiber in one direction. As a result, by double integration, the value of the SBS threshold was raised, and the direction for future scientific research was determined. If the possibility of increasing the threshold of SBS is proved, then increasing the distance of amplifiers in the main networks, respectively, its economic effect increases. In addition, it can be noted that there are no scientific papers devoted to the study of the effects of optical nonlinear effects by combining and distributing these two compounds along a single optical fiber. This article discusses the issues of improving the capacity and determination of the threshold for stimulated Brillouin scattering. To increase the power threshold is invited to consider the dependence of the phase modulation frequency of the spectral width of the laser radiation. In addition, the fact that the SBS threshold did not reach the value at an energy of 27 DB in the case of the double-beam distribution can be proved by discrepancies in comparison with the results of experimental studies and the results of the model that determines the SBS effect

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Section: Interpretation Of the Obtained Results By The Methods Of Dir...mentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Modeling the method for determining the stimulated brillouin scattering threshold in a single-mode optical fiber

Zhumazhanov

Zhetpisbayeva

Zhetpisbayev³

et al. 2022

EEJET

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“…Stimulated Brillouin scattering (SBS) is a useful nonlinear optical effect happening in high-power single frequency lasers. Over the past decades, SBS has attracted wide attention owing to its broad applications, such as SBS phase conjugation mirror [7], pulse compression [8,9], beam combination [10], Brillouin amplification [11,12], beam cleanup in multi-mode fiber lasers [13], and so forth. Besides the above-mentioned applications, Lu et al reported a special application called optical energy and power limiting by using SBS [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

High efficiency laser spatial beam smoothing based on stimulated Brillouin scattering

Zhu

et al. 2019

Laser Phys.

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In this paper we proposed and numerically demonstrated a novel scheme for spatial beam smoothing of high-power lasers based on stimulated Brillouin scattering (SBS). With the intensity dependent property of SBS, the higher intensity parts of the laser beam are reflected to a great extent when the other parts are transmitted through the medium with weak reflection. Then, the inputted non-uniform high-power laser beam is smoothed. As a numerically simulation experiment, the beam smoothing property of the proposed scheme was calculated in this paper. A pulsed single frequency laser was used as the pump, whose output pulse is 20th order super-Gaussian shaped with a duration of 3 ns, a beam diameter is 40 mm and a wavelength of 527 nm. The heavy fluorocarbon FC-40 was used as the nonlinear medium. The numerically calculated results indicate that the laser intensity modulation index can be greatly pulled down after passing through the Brillouin medium with a suitable laser intensity. The energy efficiency is above 90% when the laser beam is smoothed to the greatest extent.

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“…3) The pioneers in this research field have exploited these linear and deterministic properties to overcome the multiple scattering by iterative wavefront shaping, 4,5) measuring the transmission matrix, 3) and optical phase conjugation (OPC). [6][7][8][9][10][11] Among these methods, the OPC based on the principle of time reversal requires the shortest average response time per degree of freedom. It can be divided into two categories: analog OPC and digital OPC (DOPC).…”

mentioning

confidence: 99%

“…It can be divided into two categories: analog OPC and digital OPC (DOPC). Unlike analog OPC-based nonlinear crystals or effects, [6][7][8] DOPC is based on a digital image sensor and a spatial light modulator (SLM). Here, the sensor is used to acquire a scattered wavefront by digital holography, and the SLM serves to generate the phase conjugate wavefront.…”

mentioning

confidence: 99%

Rotational scanning and multiple-spot focusing through a multimode fiber based on digital optical phase conjugation

et al. 2018

Appl. Phys. Express

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We demonstrate, for the first time, the rotational memory effect of a multimode fiber (MMF) based on digital optical phase conjugation (DOPC) to achieve multiple-spot focusing. An implementation interferometer is used to address the challenging alignments in DOPC. By rotating the acquired phase conjugate pattern, rotational scanning through a MMF could be achieved by recording a single off-axis hologram. The generation of two focal spots through a MMF is also demonstrated by combining the rotational memory effect with the superposition principle. The results may be useful for ultrafast scanning imaging and optical manipulation of multiple objects through a MMF.

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Mechanism of beam cleanup by stimulated Brillouin scattering in multimode fibers

Cited by 16 publications

References 21 publications

Modeling the method for determining the stimulated brillouin scattering threshold in a single-mode optical fiber

Modeling the method for determining the stimulated brillouin scattering threshold in a single-mode optical fiber

High efficiency laser spatial beam smoothing based on stimulated Brillouin scattering

Rotational scanning and multiple-spot focusing through a multimode fiber based on digital optical phase conjugation

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