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早期的研究表明, 束匀滑技术能够有效地抑制高功率激光与等离子体相互作用中产生的各种参量不稳定性, 大大减少受激布里渊散射和受激拉曼散射. 但在NIF最近的实验研究中发现, 受激布里渊散射和受激拉曼散射份额远远高于预期, 原因可能与驱动激光束间的相干性有关. 本文利用神光II装置两路倍频纳秒激光辐照金平面靶, 研究了小口径取样情况下两者背向散射的能量和光谱在不同驱动激光相干条件下的变化情况. 初步结果表明, 激光束间存在着较强的相干性, 并且随着束间相干程度的增加, 背向散射也逐渐增强.
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关键词:
- 激光等离子体相互作用 /
- 束间相干性 /
- 背向散射
Previous studies have shown that the technology of beam smoothing may effectively control parameter instabilities within the laser-plasma interaction, and greatly reduce stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS). However, the recent experimental results on NIF revealed a much higher SBS and SRS than expected, one possible reason is due to the coherence between incident laser beams. In our research, two laser beams from Shenguang II facility are employed to irradiate an Au plate target, the energy and spectra of the backscattered light are measured in different coherent conditions. The results show that the driven-laser beams strongly interfere with each other, and usually the backscatter becomes strong gradually with the increase of coherent degree between the incident beams.-
Keywords:
- laser plasma interaction /
- coherence between beams /
- backscatter
[1] Baldis H A, Montgomery D S, Moody J D, Labaune C, Batha S H, Estabrook K G, Berger R L, Kruer W L 1992 Plasma Physics and Controlled Fusion 34 2077
[2] Wang C K, Liu S Y, Wang Z B, Jiang G, Kuang L Y, Li W H, Jiang X H, Liu Y G, Tang X Q 2006 Nucl. Phys. Rev. 23 59 (in Chinese) [王传珂, 刘慎业, 王哲斌, 蒋刚, 况龙钰, 李文洪, 蒋小华, 刘永刚, 汤小青 2006 原子核物理评论 23 59]
[3] Wang C K, Jiang X H, Liu S Y, Kuang L Y, Wang Z B, Liu Y G, Li S W, Li W H 2006 High Power Laser and Particle Beams 18 1113 (in Chinese) [王传珂, 蒋小华, 刘慎业, 况龙钰, 刘永刚, 李三伟, 李文洪 2006 强激光与粒子束 18 1113]
[4] Hinkel D E, Callahan D A, Langdon A B, Langer S H, Still C H, Williams E A 2008 Physics of Plasmas 15 056314
[5] Meezan N B, Atherton L J, Callahan D A, Dewald E L, Dixit S, Dzenitis E G, Edwards M J, Haynam C A, Hinkel D E, Jones O S, Landen O, London R A, Michel P A, Moody J D, Milovich J L, Schneider M B, Thomas C A, Town R P J, Warrick A L, Weber S V, Kidmann K, Glenzer S H, Suter L J, MacGowan B J, Kline J L, Kyrala G A, Nikroo A 2010 Physics of Plasmas 17 056304
[6] MacGowan B J, Afeyan B B, Back C A, Berger R L, Bonnaud G, Casanova M, Cohen B I, Desenne D E, DuBois D F, Dulieu A G, Estabrook K G, Fernandez J C, Glenzer S H, Hinkel D E, Kaiser T B, Kalantar D H, Kauffman R L, Kirkwood R K, Kruer W L, Langdon A B, Lasinski B F, Montgomery D S, Moody J D, Munro D H, Powers L V, Rose H A, Rousseaux C, Turner R E, Wilde B H, Wilks S C, Williams E A 1996 Physics of Plasmas 3 2029
[7] Niemann C, Divol L, Froula D H, Gregori G, Jones O, Kirkwood R K, MacKinnon A J, Meezan N B, Moody J D, Sorce C, Suter L J, Bahr R, Seka W, Glenzer S H 2005 Phys. Rev. Lett. 94 85005
[8] Froula D H, Divol L, Meezan N B, Dixit S, Moody J D, Neumayer P, Pollock B B, Ross J S, Glenzer S H 2007 Phys. Rev. Lett. 98 85001
[9] Froula D H, Divol L, London R A, Michel P, Berger R L, Meezan N B, Neumayer P, Ross J S, Wallace R, Glenzer S H 2008 Phys. Rev. Lett. 100 15002
[10] Jiang X J, Lin Z Q 2010 Laser & Optoelectronics Progress. 9 22 (in Chinese) [江秀娟, 林尊琪 2010 激光与光电子学进展 9 22]
[11] Froula D H, Divol L, London R A, Berger R L, Döppner T, Meezan N B, Ralph J, Ross J S, Suter L J, Glenzer S H 2010 Physics of Plasmas 17 056302
[12] Niemann C, Berger R L, Divol L, Froula D H, Kirkwood R K, Meeezan N, Moody J D, Ross J, Sorce C, Suter L J, Glenzer S H 2008 Phys. Rev. Lett. 100 45002
[13] Lindl J D, Amendt P, Berger R L, Glendinning S G, Glenzer S H, Haan S W, Kauffman R L, Landen O L, Suter L J 2004 Physics of Plasmas 11 339
[14] Wang Z B, Zheng J, Jiang X H, Liu S Y, Li W H, Liu W D, Yu C X, Liu Y G, Zhang H Y, Tan X Q, Peng X S, Ding Y K, Zheng Z J 2004 High Power Laser and Particle Beams 16 45 (in Chinese) [王哲斌, 郑坚, 蒋小华, 刘慎业, 李文洪, 刘万东, 俞昌旋, 刘永刚, 张海鹰, 谭晓青, 彭晓世, 丁永坤, 郑志坚 2004 强激光与粒子束 16 45]
[15] Zhang J T 1999 Laser Plasma Interaction Physics and Simulation (1st Ed.) (Zhengzhou: Henan Science and Technology Press) 116-134 (in Chinese) [张家泰 1999 激光等离子体相互作用物理与模拟 (第1版) (郑州: 河南科学技术出版社) 第116-134页]
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[1] Baldis H A, Montgomery D S, Moody J D, Labaune C, Batha S H, Estabrook K G, Berger R L, Kruer W L 1992 Plasma Physics and Controlled Fusion 34 2077
[2] Wang C K, Liu S Y, Wang Z B, Jiang G, Kuang L Y, Li W H, Jiang X H, Liu Y G, Tang X Q 2006 Nucl. Phys. Rev. 23 59 (in Chinese) [王传珂, 刘慎业, 王哲斌, 蒋刚, 况龙钰, 李文洪, 蒋小华, 刘永刚, 汤小青 2006 原子核物理评论 23 59]
[3] Wang C K, Jiang X H, Liu S Y, Kuang L Y, Wang Z B, Liu Y G, Li S W, Li W H 2006 High Power Laser and Particle Beams 18 1113 (in Chinese) [王传珂, 蒋小华, 刘慎业, 况龙钰, 刘永刚, 李三伟, 李文洪 2006 强激光与粒子束 18 1113]
[4] Hinkel D E, Callahan D A, Langdon A B, Langer S H, Still C H, Williams E A 2008 Physics of Plasmas 15 056314
[5] Meezan N B, Atherton L J, Callahan D A, Dewald E L, Dixit S, Dzenitis E G, Edwards M J, Haynam C A, Hinkel D E, Jones O S, Landen O, London R A, Michel P A, Moody J D, Milovich J L, Schneider M B, Thomas C A, Town R P J, Warrick A L, Weber S V, Kidmann K, Glenzer S H, Suter L J, MacGowan B J, Kline J L, Kyrala G A, Nikroo A 2010 Physics of Plasmas 17 056304
[6] MacGowan B J, Afeyan B B, Back C A, Berger R L, Bonnaud G, Casanova M, Cohen B I, Desenne D E, DuBois D F, Dulieu A G, Estabrook K G, Fernandez J C, Glenzer S H, Hinkel D E, Kaiser T B, Kalantar D H, Kauffman R L, Kirkwood R K, Kruer W L, Langdon A B, Lasinski B F, Montgomery D S, Moody J D, Munro D H, Powers L V, Rose H A, Rousseaux C, Turner R E, Wilde B H, Wilks S C, Williams E A 1996 Physics of Plasmas 3 2029
[7] Niemann C, Divol L, Froula D H, Gregori G, Jones O, Kirkwood R K, MacKinnon A J, Meezan N B, Moody J D, Sorce C, Suter L J, Bahr R, Seka W, Glenzer S H 2005 Phys. Rev. Lett. 94 85005
[8] Froula D H, Divol L, Meezan N B, Dixit S, Moody J D, Neumayer P, Pollock B B, Ross J S, Glenzer S H 2007 Phys. Rev. Lett. 98 85001
[9] Froula D H, Divol L, London R A, Michel P, Berger R L, Meezan N B, Neumayer P, Ross J S, Wallace R, Glenzer S H 2008 Phys. Rev. Lett. 100 15002
[10] Jiang X J, Lin Z Q 2010 Laser & Optoelectronics Progress. 9 22 (in Chinese) [江秀娟, 林尊琪 2010 激光与光电子学进展 9 22]
[11] Froula D H, Divol L, London R A, Berger R L, Döppner T, Meezan N B, Ralph J, Ross J S, Suter L J, Glenzer S H 2010 Physics of Plasmas 17 056302
[12] Niemann C, Berger R L, Divol L, Froula D H, Kirkwood R K, Meeezan N, Moody J D, Ross J, Sorce C, Suter L J, Glenzer S H 2008 Phys. Rev. Lett. 100 45002
[13] Lindl J D, Amendt P, Berger R L, Glendinning S G, Glenzer S H, Haan S W, Kauffman R L, Landen O L, Suter L J 2004 Physics of Plasmas 11 339
[14] Wang Z B, Zheng J, Jiang X H, Liu S Y, Li W H, Liu W D, Yu C X, Liu Y G, Zhang H Y, Tan X Q, Peng X S, Ding Y K, Zheng Z J 2004 High Power Laser and Particle Beams 16 45 (in Chinese) [王哲斌, 郑坚, 蒋小华, 刘慎业, 李文洪, 刘万东, 俞昌旋, 刘永刚, 张海鹰, 谭晓青, 彭晓世, 丁永坤, 郑志坚 2004 强激光与粒子束 16 45]
[15] Zhang J T 1999 Laser Plasma Interaction Physics and Simulation (1st Ed.) (Zhengzhou: Henan Science and Technology Press) 116-134 (in Chinese) [张家泰 1999 激光等离子体相互作用物理与模拟 (第1版) (郑州: 河南科学技术出版社) 第116-134页]
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