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等离子体中的背向拉曼散射机理可以用来产生超短超强的激光脉冲. 本文采用粒子模拟方法模拟研究了等离子体密度对激光拉曼放大过程的影响. 研究发现, 过低的等离子体密度会导致等离子体波提前波破而降低能量转换效率; 而过高的等离子体密度又会导致其他不稳定性的快速增长, 限制作用距离和输出能量. 因此, 拉曼放大机理的最佳等离子体密度应处于等离子体波破的密度阈值附近, 可以获得最高的能量转换效率和能量输出. 另外, 空间频谱分析显示放大激光的强度饱和主要来自于自相位调制不稳定性的发展. 利用1013 W·cm-2的抽运激光脉冲, 模拟证实拉曼放大机理可有效地将种子激光的强度从1013 W·cm-2 放大到1017 W·cm-2, 脉宽压缩到40 fs, 且能量转换效率达到58%.
[1] Zhang J T, He B, He X T, Chang T Q, Xu L B, Andereev N E 2001 Acta Phys. Sin. 50 921 (in Chinese) [张家泰, 何斌, 贺贤土, 常铁强, 许林宝, 安德列夫 N E 2001 物理学报 50 921]
[2] Tabak M, Hammer J, Glinsky M E, Kruer W L, Wilks S C, Woodworth J, Campbell E M, Perry M D, Mason R J 1994 Phys. Plasma 1 1626
[3] Hinkel D E 2013 Nucl. Fusion 53 104027
[4] Esarey E, Schroeder C B, Leemans W P 2009 Rev. Mod. Phys. 81 1229
[5] Zhou C T, Wang X G, Wu S Z, Cai H B, Wang F, He X T 2010 Appl. Phys. Lett. 97 201502
[6] Zhang Z M, He X T, Sheng Z M, Yu M Y 2012 Appl. Phys. Lett. 100 134103
[7] Lichters R, Meyer-ter-Vehn J, Pukhov A 1996 Phys. Plasmas 3 3425
[8] Esirkepov T Zh, Bulanov S V, Kando M, Pirozhkov A S, Zhidkov A G 2009 Phys. Rev. Lett. 103 025002
[9] Ji L L, Shen B F, Li D X, Wang D, Leng Y X, Zhang X M, Wen M, Wang W P, Xu J C, Yu Y H 2010 Phys. Rev. Lett. 105 025001
[10] Strickland D, Mourou G 1985 Opt. Commun. 56 219
[11] Shvets G, Fisch N J, Pukhov A, Meyer-ter-Vehn J 1998 Phys. Rev. Lett. 81 4879
[12] Malkin V M, Shvets G, Fisch N J 1999 Phys. Rev. Lett. 82 4448
[13] Mourou G A, Fisch N J, Malkin V M, Toroker Z, Khazanov E A, Sergeev A M, Tajima T, Garrec B L 2012 Opt. Commun. 285 720
[14] Tang Y H, Han S S, Zhang C X, Wu Y Q, Cheng J, Zhong F C Zhu Y Z, Xu Z Z 2002 Chin. Phys. 11 50
[15] Zhou C L, Ye W H, Lu X P 2014 Acta Phys. Sin. 63 085207 (in Chinese) [邹长林, 叶文华, 卢新培 2014 物理学报 63 085207]
[16] Ping Y, Geltner I, Fisch N J, Shvets G, Suckewer S 2000 Phys. Rev. E 62 4532
[17] Ping Y, Cheng W, Suckewer S, Clark D S, Fisch N J 2004 Phys. Rev. Lett. 92 175007
[18] Dreher M, Takahashi E, Meyer-ter-Vehn J, Witter K J 2004 Phys. Rev. Lett. 93 095001
[19] Cheng W, Avitzour Y, Ping Y, Suckewer S, Fisch N J, Hur M S, Wurtele J S 2005 Phys. Rev. Lett. 94 045003
[20] Ren J, Cheng W F, Li S L, Suckewer S 2007 Nat. Phys. 3 732
[21] Clark D S, Fisch N J 2003 Phys. Plasmas 10 4848
[22] Yampolsky N A, Fisch N J 2009 Phys. Plasmas 16 072105
[23] Zhang Z M, He X T, Sheng Z M, Yu M Y 2011 Phys. Plasmas 18 023110
[24] Fraiman G M, Yampolsky N A, Malkin V M, Fisch N J 2002 Phys. Plasmas 9 3617
[25] Wang T L, Clark D S, Strozzi D J, Wilks S C, Martins S F, Kirkwood R K 2010 Phys. Plasmas 17 023109
[26] Malkin V M, Toroker Z, Fisch N J 2012 Phys. Plasmas 19 023109
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[1] Zhang J T, He B, He X T, Chang T Q, Xu L B, Andereev N E 2001 Acta Phys. Sin. 50 921 (in Chinese) [张家泰, 何斌, 贺贤土, 常铁强, 许林宝, 安德列夫 N E 2001 物理学报 50 921]
[2] Tabak M, Hammer J, Glinsky M E, Kruer W L, Wilks S C, Woodworth J, Campbell E M, Perry M D, Mason R J 1994 Phys. Plasma 1 1626
[3] Hinkel D E 2013 Nucl. Fusion 53 104027
[4] Esarey E, Schroeder C B, Leemans W P 2009 Rev. Mod. Phys. 81 1229
[5] Zhou C T, Wang X G, Wu S Z, Cai H B, Wang F, He X T 2010 Appl. Phys. Lett. 97 201502
[6] Zhang Z M, He X T, Sheng Z M, Yu M Y 2012 Appl. Phys. Lett. 100 134103
[7] Lichters R, Meyer-ter-Vehn J, Pukhov A 1996 Phys. Plasmas 3 3425
[8] Esirkepov T Zh, Bulanov S V, Kando M, Pirozhkov A S, Zhidkov A G 2009 Phys. Rev. Lett. 103 025002
[9] Ji L L, Shen B F, Li D X, Wang D, Leng Y X, Zhang X M, Wen M, Wang W P, Xu J C, Yu Y H 2010 Phys. Rev. Lett. 105 025001
[10] Strickland D, Mourou G 1985 Opt. Commun. 56 219
[11] Shvets G, Fisch N J, Pukhov A, Meyer-ter-Vehn J 1998 Phys. Rev. Lett. 81 4879
[12] Malkin V M, Shvets G, Fisch N J 1999 Phys. Rev. Lett. 82 4448
[13] Mourou G A, Fisch N J, Malkin V M, Toroker Z, Khazanov E A, Sergeev A M, Tajima T, Garrec B L 2012 Opt. Commun. 285 720
[14] Tang Y H, Han S S, Zhang C X, Wu Y Q, Cheng J, Zhong F C Zhu Y Z, Xu Z Z 2002 Chin. Phys. 11 50
[15] Zhou C L, Ye W H, Lu X P 2014 Acta Phys. Sin. 63 085207 (in Chinese) [邹长林, 叶文华, 卢新培 2014 物理学报 63 085207]
[16] Ping Y, Geltner I, Fisch N J, Shvets G, Suckewer S 2000 Phys. Rev. E 62 4532
[17] Ping Y, Cheng W, Suckewer S, Clark D S, Fisch N J 2004 Phys. Rev. Lett. 92 175007
[18] Dreher M, Takahashi E, Meyer-ter-Vehn J, Witter K J 2004 Phys. Rev. Lett. 93 095001
[19] Cheng W, Avitzour Y, Ping Y, Suckewer S, Fisch N J, Hur M S, Wurtele J S 2005 Phys. Rev. Lett. 94 045003
[20] Ren J, Cheng W F, Li S L, Suckewer S 2007 Nat. Phys. 3 732
[21] Clark D S, Fisch N J 2003 Phys. Plasmas 10 4848
[22] Yampolsky N A, Fisch N J 2009 Phys. Plasmas 16 072105
[23] Zhang Z M, He X T, Sheng Z M, Yu M Y 2011 Phys. Plasmas 18 023110
[24] Fraiman G M, Yampolsky N A, Malkin V M, Fisch N J 2002 Phys. Plasmas 9 3617
[25] Wang T L, Clark D S, Strozzi D J, Wilks S C, Martins S F, Kirkwood R K 2010 Phys. Plasmas 17 023109
[26] Malkin V M, Toroker Z, Fisch N J 2012 Phys. Plasmas 19 023109
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