Stimulated Brillouin scattering of backward stimulated Raman scattering

Stimulated Brillouin scattering of backward stimulated Raman scattering
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后向受激拉曼散射的受激布里渊散射

DOI:
10.1038/s41598-020-59727-4
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发表时间:
2020-02
期刊:
影响因子:
4.6
通讯作者:
Xiantu He
Xiantu He
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Qingsong Feng;Lihua Cao;Zhanjun Liu;Chunyang Zheng;Xiantu He

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通过相对论Vlasov-Maxwell模拟和粒子模拟发现,在高电子密度区,受激布里渊散射(SBS)对后向受激拉曼散射(BSRS)产生了再散射,BSRS处于绝对不稳定区,在所有散射中占主导地位。用一维Vlasov模拟和二维PIC模拟验证了BSRS在绝对不稳定区存在受激布里渊散射。在绝对不稳定区,BSRS的受激布里渊散射甚至比前向受激拉曼散射(FSRS)和受激布里渊散射更强。因此,除了朗缪尔衰减不稳定性和激光能量吸收外,背散射受激布里渊散射也是高电子密度区背散射受激布里渊散射的重要饱和机制。
The rescattering of backward stimulated Raman scattering (BSRS) by stimulated Brillouin scattering (SBS) is found in the high electron density region by relativistic Vlasov-Maxwell simulation and particle-in-cell (PIC) simulation, where the BSRS is in the regime of absolute instability and dominates in all the scatterings. Both one dimension (1D) Vlasov simulation and two dimension (2D) PIC simulation have been given to verify that there exists SBS of BSRS in the regime of absolute instability for BSRS. The SBS of BSRS will be even stronger than forward stimulated Raman scattering (FSRS) and SBS in regime of absolute instability for BSRS. Thus, besides Langmuir decay instability and laser energy absorption, the SBS of BSRS is also an important saturation mechanism of BSRS in high electron density region.
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