Burst behavior due to the quasimode excited by stimulated Brillouin scattering in high-intensity laser–plasma interactions

Feng, Qingsong; Cao, Lihua; Liu, Z. J.; Zheng, Chunyang; He, X. T.

doi:10.1017/hpl.2019.44

Cited by 4 publications

(5 citation statements)

References 42 publications

(59 reference statements)

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“…Both systems depend heavily on laser-plasma interactions (LPI) [4,5], which can degrade implosion output by lowering laser coupling to the target, increasing drive asymmetries, and preheating the fuel by producing and depositing suprathermal electrons. Cross-beam energy transfer (CBET), stimulated Brillouin scattering (SBS) [5][6][7][8], and stimulated Raman scattering (SRS) [9][10][11] are examples of laser plasma instabilities that prevent the development of the necessary time-dependent drivesymmetry in ICF.…”

Section: Introductionmentioning

confidence: 99%

Effect of chirp on stimulated-forward Raman scattering in a magnetised plasma with rippled density for fusion applications

2023

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Stimulated Raman scattering (SRS) is one of the mechanisms limiting power scalingin inertial confinement fusion (ICF). In this work, we demonstrate the effectivesuppression of SRS by the combined effects of static density fluctuations and anazimuthal magnetic field with a propagating chirped laser pulse. In the presence ofan azimuthal magnetic field, chirped laser pulse propagates through a density-rippledplasma and undergoes stimulated-forward Raman scattering (SFRS), resulting intwo radially localized electromagnetic sidebands waves and a lower-hybrid wave.Absolute and growing modes saturate due to ion density fluctuations, which thensuppress instability growth through mode coupling. The modes modified by thecombined effect of chirp and azimuthal magnetic field are effectively damped aftersaturation. As a result, the overall growth rate of the instability reduces. Thecomparison of positive and negative chirp demonstrated that when a positive chirp isbeing used, instability is more effectively suppressed. Based on non-local theory, wehave analyzed the growth of the SFRS for positive and negative chirp and estimatedit for ICF-relevant parameters and observed the effect of the growth rate.

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Section: Introductionmentioning

confidence: 99%

Effect of chirp on stimulated-forward Raman scattering in a magnetised plasma with rippled density for fusion applications

2023

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“…[1,2] Stimulated Brillouin scattering (SBS) is the most limiting effect in terms of power handling capacity in high-power narrow-linewidth fiber lasers. [3,4] Over the decades, a variety of techniques have been implemented in order to suppress SBS, [5] such as introducing nonuniformities by stressing the optical fiber, [6] reducing the overlap between the light wave field and the sound wave field in the core by changing the doping composition and distribution in the core, [7][8][9][10] reducing effective fiber length, [11] broadening spectral linewidth of seed by pure phase modulation, etc. [12][13][14][15] Specifically, white noise source (WNS) [16][17][18][19] and pseudo-random binary sequence (PRBS) [20][21][22][23] phase modulation become the leading linewidth broadening schemes for high power fiber amplifiers which are required to balance the narrow-linewidth and the output power.…”

Section: Introductionmentioning

confidence: 99%

Brillouin gain spectrum characterization in Ge-doped large-mode-area fibers*

Niu¹,

Yang²,

Zhao³

et al. 2021

Chinese Phys. B

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The dependence of Brillouin gain spectrum (BGS) characteristics, including the Brillouin frequency shift (BFS) and the BGS bandwidth, on germanium concentration in large-mode-area Ge-doped passive fibers is theoretically and experimentally investigated. Simulation results show that BFS is inversely proportional to GeO2 concentration, and BGS bandwidth increases with the GeO2 concentration initially, and then followed by a decrease. BGS of four fibers with different GeO2 concentration with core diameters of 10 μm and 20 μm are compared experimentally. Experimental results demonstrate that with the same core diameter, the variation of BFS and BGS bandwidth with GeO2 concentration agrees with the simulation results. Additionally, the BGS characteristics of three large-mode-area passive fibers with diameters of 10 μm, 25 μm, and 30 μm are measured, which confirms that increasing the fiber diameters will cause the BGS bandwidth to broaden. We believe that these results can provide valuable references for the modulation of high-power narrow-linewidth fiber lasers and Brillouin fiber amplifiers.

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“…In particular, it is possible to use metal nanoparticles to exceed the diffraction limit of light wave . Moreover, the metal nanoparticles can achieve super‐scattering or enhanced directional scattering at the nanometer scale …”

Section: Introductionmentioning

confidence: 99%

“…Therefore, metal nanoparticles control light scattering by using only electric resonance. Also, the intrinsic loss of metal nanoparticles severely limits the optical properties of nanoparticles in the visible or near‐infrared regions …”

Section: Introductionmentioning

confidence: 99%

Improvement of unidirectional scattering characteristics based on multiple nanospheres array

Jiang

Fang

Yan

et al. 2020

Micro & Optical Tech Letters

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All dielectric nanospheres with low loss and ultra-compact characteristics can be effectively applied in nanophotonics in the visible and infrared ranges. The unidirectional forward scattering with azimuthally symmetry can be achieved by simple dielectric nanosphere. The physical origin of this directionality can be attributed to the interference effect of electric and magnetic resonances induced in nanoshperes. For the forward scattering of a single nanosphere the spectrally overlapping resonance of electric and magnetic quadrupoles can further enhance the directionality and magnitude of unidirectional forward scattering. For a nanosphere homodimers, the scattering pattern can also preserve the azimuthal asymmetry and the suppression of backscattering. But, the side scattering lobes occur due to the grating diffraction effect. Furthermore, the significant improvement of scattering magnitude and directionality can be achieved by a linear chain of nanospheres. These unique optical scattering of nanoshperes can be applied in the fields of nanoantennas, photovoltaics, and nanolasers in visible and near infrared ranges.

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Burst behavior due to the quasimode excited by stimulated Brillouin scattering in high-intensity laser–plasma interactions

Cited by 4 publications

References 42 publications

Effect of chirp on stimulated-forward Raman scattering in a magnetised plasma with rippled density for fusion applications

Effect of chirp on stimulated-forward Raman scattering in a magnetised plasma with rippled density for fusion applications

Brillouin gain spectrum characterization in Ge-doped large-mode-area fibers*

Improvement of unidirectional scattering characteristics based on multiple nanospheres array

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