Theoretical and Numerical Study of the Threshold of Stimulated Brillouin Scattering in Multimode fibers

Lü, Hongliang; Zhang, Pu; Wang, Xiaolin; Jiang, Zongfu

doi:10.1109/jlt.2015.2476364

Cited by 15 publications

(3 citation statements)

References 27 publications

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“…High power linearly polarized all-fiber lasers or MOPAs with narrow linewidth and near diffraction limited beam quality have important applications for nonlinear frequency conversion [1], spectral beam combining (SBC) [2]- [5] and coherent beam combining (CBC) [6]- [8]. However, nonlinear effects (NLE) such as SBS [9], four-wave-mixing (FWM) [10], [11] and mode instability (MI) [12] effects have limited the power scaling of this type of narrow linewidth fiber laser systems. Over the past decade, several methods were employed in these systems for NLE and MI suppression.…”

Section: Introductionmentioning

confidence: 99%

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

Feng

Chang

et al. 2020

IEEE Photonics J.

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As a major limitation for power scaling of high power narrow linewidth fiber master oscillator power amplifiers (MOPAs), Stimulated Brillouin Scattering (SBS) induced selfpulsing in polarization maintaining (PM) fiber amplifiers is well characterized and analyzed in this paper by comparing different white noise signal (WNS) phase-modulated modes in experiments. It is found that the self-pulsing effect is not observed in the PM-amplifier with single-frequency laser seed injection, and cascaded WNS modulation provides superior self-pulsing suppression than single WNS modulation with similar output linewidth. Moreover, the experimental results indicate that the self-pulsing threshold can hardly be predicted only by the output linewidth or the defined SBS threshold in a WNS phase modulated fiber amplifier system. As self-pulsing is originated from the spectral spikes in WNS modulated system, we theoretically analyzed characteristics of these spikes in different phase-modulation modes. It indicates the spectral peak intensity can be reduced by cascaded modulation, for which self-pulsing can be suppressed. The theoretical predictions agree well with the experimental results. At the same time, in order to suppress the mode instability effect, a plum blossom shaped bending mode selection device is used in this high-power narrow linewidth fiber amplifier system. Finally, a 32 GHz cascaded WNSs modulated, over than 2.5 kW linearly polarized all-fiber amplifier with a slope efficiency of 86.7% is demonstrated. The polarization extinction ratio (PER) is measured larger than 14 dB and the beam quality factor M 2 maintains lower than 1.3 in the power scaling process.

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Section: Introductionmentioning

confidence: 99%

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

Feng

Chang

et al. 2020

IEEE Photonics J.

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“…Increasing brightness of such fiber lasers have always been the research focus. However, limited by nonlinear effects such as stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS) and thermally induced mode instability (TMI) effect [ 6 , 7 , 8 ], the increase of output power without degradation of beam quality of narrow linewidth fiber lasers still faces many challenges.…”

Section: Introductionmentioning

confidence: 99%

3.96 kW All-Fiberized Linearly Polarized and Narrow Linewidth Fiber Laser with Near-Diffraction-Limited Beam Quality

Ren

et al. 2022

Nanomaterials

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In this paper, we realize a 3.96 kW all-fiberized and polarization-maintained (PM) amplifier with narrow linewidth and near-diffraction-limited beam quality. Based on a master oscillator power amplifier (MOPA) configuration seeded with phase-modulated single-frequency laser, a 3.96 kW signal laser is achieved with a 3 dB linewidth of 0.62 nm at the pump power of 5.02 kW. At the maximum output power, the polarization extinction ratio (PER) is ~13.9 dB, and the beam quality (M2 factor) is M2x = 1.31, M2y = 1.41. As far as we know, this is the maximum output power of PM narrow linewidth fiber laser with near-diffraction-limited beam quality and all-fiber format.

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“…The key indicators of the spectral synthesis system are high power and high beam quality, which are determined by sub-modules.The typical characteristics of sub-modules are narrow linewidth and near diffraction limited beam quality. Such sub-modules are referred to as high power linearly polarized all-fiber lasers.However, To obtain high power of this type of lasers is limited by nonlinear effects such as stimulated brillouin scattering (SBS) and mode instability (MI) effects [4,5].In order to deal with MI effect, the method of mode selection by coiling the gain fiber is employed. In contrast to MI effect, the SBS effect is even more intractable.…”

Section: Introductionmentioning

confidence: 99%

High power linearly polarized narrow linewidth fiber laser

Yu¹,

Chang²,

Deng³

et al. 2022

Seventeenth National Conference on Laser Technology and Optoelectronics

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Spectral beam combining technology based on diffraction grating is an effective method to obtain tens of thousands of watts or even hundreds of thousands of watts of high-power and high beam quality laser. The high power linearly polarized narrow linewidth fiber laser is an ideal sub-beam source in spectral beam combining systems. Limited by stimulated brillouin scattering and mode instability, the power increase of narrow linewidth lasers has been limited, especially in linear polarization systems. In this paper, we report a high-power line polarized narrow line width fiber laser. The white noise signal (WNS) phase modulation and the pseudo-random binary sequence (PRBS) phase modulation were combined to widen the single-frequency laser line width, and then the three-stages fiber amplifier was used to amplify the narrow-line width laser for power, A high power line polarized narrow line width laser with a center wavelength of 1064nm, a power of 2070W and a 3dB line width of 23GHz was finally obtained. The laser polarization extinction ratio is greater than 14dB.

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Theoretical and Numerical Study of the Threshold of Stimulated Brillouin Scattering in Multimode fibers

Cited by 15 publications

References 27 publications

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

3.96 kW All-Fiberized Linearly Polarized and Narrow Linewidth Fiber Laser with Near-Diffraction-Limited Beam Quality

High power linearly polarized narrow linewidth fiber laser

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