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脉冲激光束在低真空(约2 Pa)环境下聚焦到高纯Zn靶表面, 烧蚀区域不仅有中心深孔的宏观损伤, 而且还发现大量微米量级的类似足球形状的金属Zn球体结构附着生长在孔洞内侧表面. 实验过程中采用等离子体光谱诊断技术研究宏观和微观损伤对后续脉冲激光的影响程度. 与聚焦于金属Zn平滑表面相比, 宏观损伤可以使后续激光诱导的Zn原子334.5 nm谱线强度提高10.3%, 在此基础上大量Zn微米球体附着在内表面可以使谱线强度再提高34.3%. 因此, 推断这些金属Zn微球表面镶嵌着光洁的纳米量级六边形和五边形小平面, 可以对后续脉冲激光产生镜面反射, 使得激光能量汇聚并耦合增强, 提高烧蚀效率. 实验结果还表明, 这些微米球体的数目随着激光脉冲次数的增加而增多, 使得后续激光能够诱导产生更为致密高温的等离子体. 研究结果有望为激光-金属微孔技术提供新思路.
[1] DeMange P, Negress R A, Raman R N, Colvin J D, Demos S G 2011 Phys. Rev. B 84 054118
[2] Carr C W, Radousky H B, Rubenchik A M, Feit M D, Demos S G 2004 Phys. Rev. Lett. 92 087401
[3] Yan Z J, Bao R Q, Huang Y, Caruso A N, Qadri S B, Dinu C Z, Chrisey D B 2010 J. Phys. Chem. C 114 3869
[4] Yan Z J, Bao R Q, Huang Y, Chrisey D B 2011 Nanotechnology 22 265610
[5] Wang H Q, Koshizaki N, Li L, Kawaguchi K, Li X, Pyatenko A, Swiatkowska-Warkocka Z, Bando Y, Golberg D 2011 Adv. Mater. 23 1865
[6] Gao X D, Long G F, Wang R L, Katayama S 2012 Acta Phys. Sin. 61 098103 (in Chinese) [高向东, 龙观富, 汪润林, Katayama Seiji 2012 物理学报 61 098103]
[7] Yu G, Yang S H, Wang M, Kou S Q, Lin B J, Lu W C 2012 Acta Phys. Sin. 61 092801 (in Chinese) [于歌, 杨慎华, 王蒙, 寇淑清, 林宝君, 卢万春 2012 物理学报 61 092801]
[8] Chen M, Liu Y H, Liu X D, Zhao M W 2012 Laser Phys. Lett. 9 730
[9] Chen M, Liu X D, Liu Y H, Zhao M W 2012 J. Appl. Phys. 111 103108
[10] Chen M, Liu X D, Liu Y H, Zhao M W 2012 Chin. Opt. Lett. 10 051402
[11] Wiese W L, Martin G A 1969 Atomic Transition Probabilities (Washington: National Stand)
[12] Bekfi G 1976 Principles of Laser Plasmas (New York: Wiley)
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[1] DeMange P, Negress R A, Raman R N, Colvin J D, Demos S G 2011 Phys. Rev. B 84 054118
[2] Carr C W, Radousky H B, Rubenchik A M, Feit M D, Demos S G 2004 Phys. Rev. Lett. 92 087401
[3] Yan Z J, Bao R Q, Huang Y, Caruso A N, Qadri S B, Dinu C Z, Chrisey D B 2010 J. Phys. Chem. C 114 3869
[4] Yan Z J, Bao R Q, Huang Y, Chrisey D B 2011 Nanotechnology 22 265610
[5] Wang H Q, Koshizaki N, Li L, Kawaguchi K, Li X, Pyatenko A, Swiatkowska-Warkocka Z, Bando Y, Golberg D 2011 Adv. Mater. 23 1865
[6] Gao X D, Long G F, Wang R L, Katayama S 2012 Acta Phys. Sin. 61 098103 (in Chinese) [高向东, 龙观富, 汪润林, Katayama Seiji 2012 物理学报 61 098103]
[7] Yu G, Yang S H, Wang M, Kou S Q, Lin B J, Lu W C 2012 Acta Phys. Sin. 61 092801 (in Chinese) [于歌, 杨慎华, 王蒙, 寇淑清, 林宝君, 卢万春 2012 物理学报 61 092801]
[8] Chen M, Liu Y H, Liu X D, Zhao M W 2012 Laser Phys. Lett. 9 730
[9] Chen M, Liu X D, Liu Y H, Zhao M W 2012 J. Appl. Phys. 111 103108
[10] Chen M, Liu X D, Liu Y H, Zhao M W 2012 Chin. Opt. Lett. 10 051402
[11] Wiese W L, Martin G A 1969 Atomic Transition Probabilities (Washington: National Stand)
[12] Bekfi G 1976 Principles of Laser Plasmas (New York: Wiley)
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