Simultaneous stimulated Raman, Brillouin, and electron-acoustic scattering reveals a potential saturation mechanism in Raman plasma amplifiers

Turnbull, D.; Li, S.; Morozov, A.; Suckewer, S.

doi:10.1063/1.4748290

Cited by 33 publications

(14 citation statements)

References 25 publications

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“…40,41 The obtained spectrum resembles strongly the one presented here for the 80 fspulse, i.e., the SRS-and SBS-signatures do not overlap. The presence of SRS and SBS is due to the simultaneous excitation of the modes and their competition might indicate a saturation mechanism.…”

Section: Discussionsupporting

confidence: 74%

Spectral characteristics of ultra-short laser pulses in plasma amplifiers

et al. 2013

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Amplification of laser pulses based on the backscattering process in plasmas can be performed using either the response of an electron plasma wave or an ion-acoustic wave. However, if the pulse durations become very short and the natural spread in frequency a substantial amount of the frequency itself, the Raman and Brillouin processes start to mix. Kinetic simulations show the transition from a pure amplification regime, in this case strong-coupling Brillouin, to a regime where a considerable downshift of the frequency of the amplified pulse takes place. It is conjectured that in the case of very short pulses, multi-modes are excited which contribute to the amplification process. V C 2013 AIP Publishing LLC. [http://dx.

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Section: Discussionsupporting

confidence: 74%

Spectral characteristics of ultra-short laser pulses in plasma amplifiers

et al. 2013

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“…The first experimental observation of this competitive phenomenon was made by Walsh et al (1984) in which they observed that the quenching of SRS plasma waves were strongly correlated to the initiation of SBS ion waves. Recently, it has been found experimentally that for plasma based laser amplifiers, it is essential to study SRS and SBS simultaneous at relativistic laser power (Turnbull et al, 2012;Weber et al, 2013). Therefore, the motivation of the present work is to understand the effect of the coexistence on the growth, saturation, and the reflectivity of SRS and SBS including the effect of relativistic selffocusing of intense Gaussian laser beam.…”

Section: Introductionmentioning

confidence: 97%

Study of coexisting stimulated Raman and Brillouin scattering at relativistic laser power

2014

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This paper presents a model to study the stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) simultaneously at relativistic laser power. At high intensity, the relativistic mass correction for the plasma electrons becomes significant and the plasma refractive index gets modified which leads to the relativistic self-focusing of the pump beam. This filamentation process affects the scattering processes (SRS and SBS) and at the same time the pump filamentation process also gets modified in the presence of the coexisting SRS and SBS due to the pump depletion. We have also demonstrated that the pump depletion and relativistic filamentation affects the back-reflectivity of scattered beams (SRS and SBS) significantly, for the coexistence case.

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“…5,6 For very high intensities, Raman and Brillouin processes might be even mixed. [7][8][9] Even though scattering is initiated more quickly in the Raman case, utilizing ion modes for backscattering may prove to be more robust and less demanding with respect to the plasma parameters.…”

Section: Introductionmentioning

confidence: 98%

Control of Brillouin short-pulse seed amplification by chirping the pump pulse

Lehmann

Spatschek

2015

Physics of Plasmas

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Seed amplification via Brillouin backscattering of a long pump pulse is considered. Similar to Raman amplification, several obstructive effects may occur during short-pulse Brillouin amplification. One is the spontaneous Raman backscattering of the pump before interacting with the seed. Preforming the plasma and/or chirping the pump will reduce unwanted pump backscattering. Optimized regions for low-loss pump propagation were proposed already in conjunction with Raman seed amplification. Hence, the influence of the chirp of the pump during Brillouin interaction with the seed becomes important and will be considered here. Both, the linear as well as the nonlinear evolution phases of the seed caused by Brillouin amplification under the action of a chirped pump are investigated. The amplification rate as well as the seed profiles are presented as function of the chirping rate. Also the dependence of superradiant scaling rates on the chirp parameter is discussed. V C 2015 AIP Publishing LLC. [http://dx.

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Simultaneous stimulated Raman, Brillouin, and electron-acoustic scattering reveals a potential saturation mechanism in Raman plasma amplifiers

Cited by 33 publications

References 25 publications

Spectral characteristics of ultra-short laser pulses in plasma amplifiers

Spectral characteristics of ultra-short laser pulses in plasma amplifiers

Study of coexisting stimulated Raman and Brillouin scattering at relativistic laser power

Control of Brillouin short-pulse seed amplification by chirping the pump pulse

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