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使用等离子体背向受激拉曼散射对激光进行放大时, 等离子体的密度、温度和长度都会对激光的放大效果产生影响. 为了探究等离子体密度对结果的影响, 本文使用一维粒子模拟程序模拟了波长为800 nm的泵浦激光入射到均匀等离子体中, 等离子体密度和泵浦光光强对散射光光谱的影响. 模拟结果表明, 等离子体密度降低会导致散射光的波长变短, 而泵浦光的光强在一定范围内降低会增加散射光中背向散射光的比例. 通过分析散射光的光强和等离子体的密度, 发现前向拉曼散射是等离子体密度变化的原因. 模拟结果对等离子体背向受激拉曼散射放大的实验研究具有重要的指导意义.The density, temperature and length of the plasma used in the backward Raman amplification will all influence the result. To explore the influence of the plasma density and the pump intensity, this work uses the one-dimensional particle in cell (PIC) algorithm to simulate the process of the 800 nm pump laser injecting into the plasma. By analyzing the Raman scattered light, it is found that as the density of plasma increases, the wavelengths of the scattered light shorten. It is also found that the forward Raman scattering will cause the plasma density to change, which in turn influences the scattered light wavelength. Therefore, we should choose the plasma density based on the wavelength of the pump and the scattered light, while the amplification of the scattered is related to the pump intensity.
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Keywords:
- plasma /
- laser amplification /
- backward Raman scattering /
- particle in cell algorithm
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Google Scholar
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图 1 (a) SRBS放大原理图; (b)背向拉曼散射中的动量守恒
Fig. 1. (a) Principle of backward Raman amplification; (b) conservation of momentum in backward Raman scattering
图 2 不同等离子体密度下的散射光光谱
Fig. 2. Spectrum of scattered light at different plasma densities.
图 3 等离子体密度为0.10 n cr时改变泵浦光强度得到的背向散射光光谱
Fig. 3. Spectrum of scattered light with different pump intensities with plasma density is 0.10 n cr.
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[1] Strickland D, Mourou G 1985 Opt. Commun. 56 219
Google Scholar
[2] Capjack C E, James C R, McMullin J N 1982 J. Appl. Phys. 53 4046
Google Scholar
[3] Murray J R, Goldhar J, Eimeri D, Szöke A 1979 IEEE J. Quantum Electron. 15 342
Google Scholar
[4] Ping Y, Cheng W, Suckewer S, Clark D S, Fisch N J 2004 Phys. Rev. Lett. 92 175007
Google Scholar
[5] Cheng W, Avitzour Y, Ping Y, Suckewer S, Fisch N J, Hur M S, Wurtele J S 2005 Phys. Rev. Lett. 94 045003
Google Scholar
[6] Ren J, Li S, Morozov A, Suckewer S, Yampolsky N A, Malkin V M, Fisch N J 2008 Phys. Plasmas 15 056702
Google Scholar
[7] Pai C H, Lin M W, Ha L C, Huang S T, Tsou Y C, Chu H H, Lin J Y, Wang J, Chen S Y 2008 Phys. Rev. Lett. 101 065005
Google Scholar
[8] Malkin V M, Shvets G, Fisch N J 1999 Phys. Rev. Lett. 82 4448
Google Scholar
[9] Ping Y, Kirkwood R K, Wang T L, Clark D S, Wilks S C, Meezan N, Berger R L, Wurtele J, Fisch N J, Malkin V M, Valeo E J, Martins S F, Joshi C 2009 Phys. Plasmas 16 123113
Google Scholar
[10] Barth I, Toroker Z, Balakin A A, Fisch N J 2016 Phys. Rev. E 93 063210
Google Scholar
[11] Ren J, Cheng W, Li S, Suckewer S 2007 Nat. Phys. 3 732
Google Scholar
[12] Wu Z, Chen Q, Morozov A, Suckewer S 2019 Phys. Plasmas 26 103111
Google Scholar
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Google Scholar
[14] Shuanglei L 2013 Ph. D. Dissertation (Princeton: Princeton University)
[15] Ping Y, Geltner I, Morozov A, Fisch N J, Suckewer S 2002 Phys. Rev. E 66 6
Google Scholar
[16] Arber T D, Bennett K, Brady C S, Lawrence-Douglas A, Ramsay M G, Sircombe N J, Gillies P, Evans R G, Schmitz H, Bell A R, Ridgers C P 2015 Plasma Phys. Controlled Fusion 57 113001
Google Scholar
[17] Yampolsky N A, Fisch N J 2011 Phys. Plasmas 18 056711
Google Scholar
[18] Toroker Z, Malkin V M, Fisch N J 2012 Phys. Rev. Lett. 109 085003
Google Scholar
[19] Farmer J P, Ersfeld B, Jaroszynski D A 2010 Phys. Plasmas 17 113301
Google Scholar
[20] Yang X, Vieux G, Brunetti E, Ersfeld B, Farmer J P, Hur M S, Issac R C, Raj G, Wiggins S M, Welsh G H, Yoffe S R, Jaroszynski D A 2015 Sci. Rep. 5 13333
Google Scholar
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