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Interaction Process Analysis of Nanosecondlaser Target Material(PDF)

《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

Issue:
2003年04期
Page:
431-433
Research Field:
Publishing date:

Info

Title:
Interaction Process Analysis of Nanosecondlaser Target Material
Author(s):
XuRongqing ChenXiao NiXiaowu LuJian ChengZhuhai ①
School of Sciences,NUST,Nanjing 210094)
Keywords:
ns-laser perforation optical force ablated materials
PACS:
TG665
DOI:
-
Abstract:
Extraordinary phenomena are observed when Nanosecond- laser is used to perforate thin copper films. As the one- pulse energy is raised, the number of pulses required for one perforat ion increases rather than drops at two one- pulse energy values, 85mJ and 181mJ. The anomaly at the first energy value is interpreted by laser energy loss due to dissociat ion of the surrounding air. The effect of opt ical forces on ablated materials causes the formation of a layer of dense ablated materials near the target surface at early stage of the laser’s action and the layer hinders subsequent laser beam from reaching, thus resulting in the anomaly at the second energy value.

References:

1 Chen J P, Ni X W, Lu J, et al. Initial formation process of laser- induced plasm shock wave in air[ J] . Optics Communications, 2000, 176( 4) : 437~ 440.
2 Misra A,Mitra A, Thoreja R K. Diagnostics of laser ablated plasmas using fast photography[ J] . Applied Physics Letters, 1999, 74( 7) : 929~ 931.
3 Chen J P, Ni X W, Lu J, et al. Instantaneous measurements of laser- induced plasma shock waves with an optical fiber sensor[ J] . Optics Communications, 1999, 168 ( 3) : 343~ 346.
4 Docchio F, Regondi P, Mellerio J. Study of the temporal and spatial dynamics of plasmas induced in liquids by nanosecond Nd: YAG laser pulses[ J] . Applied Optics, 1988, 27( 18) : 3 661~ 3 668

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Last Update: 2013-03-17