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Small-scale self-focusing of 200 ps laser pulses in brillouin amplification

Chinese Physics B 2015年第9期24卷 267-270页

作者：远航王雨雷吕志伟郑振兴 National Key Laboratory of Science and Technology on Tunable Laser Harbin Institute of Technology

brillouin amplification is a new method to obtain high power hundred-picosecond laser pulses for shock ignition. The laser pulse＇s intensity can be amplified to 10 GW/cm^2 through this method. In order to determine the near-field quality, the relationship between the brillouin amplification gain and the B integral in the stimulated brillouin scattering（SBS） energy transfer process was studied, and numerical simulations and calculations were carried out to explain the process. For achieving an output intensity of 10 GW/cm^2 under the condition that the effect of small–scale self-focusing is insignificant in the brillouin amplification, the influence of the configuration parameters on the brillouin amplification and the B integral was investigated. The results showed that the 10 GW/cm^2 high power output can be obtained by optimizing the intensities of the pump and Stokes light and choosing an appropriate SBS medium.

关键词： brillouin amplification super transient theory B integral

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

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High Power Laser Science and Engineering 2019年第4期7卷 1-7页

作者： Q.S.Feng L.H.Cao Z.J.Liu C.Y.Zheng X.T.He Institute of Applied Physics and Computational Mathematics Beijing 100094China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China Collaborative Innovation Center of IFSA(CICIFSA) Shanghai Jiao Tong UniversityShanghai 200240China

The strong-coupling mode,called the"quasimode",is excited by stimulated brillouin scattering(SBS)in high-intensity laser-plasma *** SBS of the quasimode competes with SBS of the fast mode(or slow mode)in multiion species plasmas,thus leading to a low-frequency burst behavior of SBS *** between the quasimode and the ion-acoustic wave(IAW)is an important saturation mechanism of SBS in high-intensity laser-plasma *** results give a clear explanation of the low-frequency periodic burst behavior of SBS and should be considered as a saturation mechanism of SBS in high-intensity laser-plasma interactions.

关键词： brillouin amplification inertial confinement fusion ion-acoustic waves quasimode stimulated brillouin scattering

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