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  • 1995-1999  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Dynamics of excimer laser ablation of thin tungsten films monitored by ultrafast photography (1995)
    Springer
    Applied physics 60 (1995), S. 431-436 
    Details
    ISSN: 1432-0630
    Keywords: 42.60 ; 78.90
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The time course of laser light induced transport of tungsten films from a glass support is followed by ultrafast photography using delayed dye laser pulses. The photographs provide unambiguous evidence that the material transport in the 40–200 mJ/cm2 intensity domain takes place via removal of solid pieces from the film material. These results are consistent with heat flow calculations which predict the overall melting of the metal layer above 380 mJ/cm2. The series of photographs presented give detailed insight into the melting process and have revealed an unexpected in-flight phase separation of solid fracture pieces and molten droplets throughout the 200–900 mJ/cm2 domain. The faster propagating molten droplets form a condensed halo in front of the solid pieces, thereby providing an efficient shield between the processing laser light and the solid phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538765
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Time-resolved investigation of the transient surface reflection changes of subpicosecond excimer laser ablated liquids (1999)
    Springer
    Applied physics 69 (1999), S. S191 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 52.75.Rx; 78.66.Qn; 81.60; 82.30.Lp; 83.70.Gp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. A single shot measurement of subpicosecond time resolution was developed to investigate the transient surface reflection changes of excimer laser ablated liquids during one UV pulse. Polysilicone oil, methyl(metacrylate), styrene, and water were irradiated by a 500 fs KrF excimer laser. The irradiated area was illuminated by an optically delayed 496 nm, 500 fs probe dye laser pulse at an incident angle of 45°. As the tilted probe beam scanned along the ablating surface, the temporal increase in the reflected intensity appeared as a spatial modulation of the probe beam. The maximum reflectivities were 1.5–2.5 times higher than those of the initial samples. The reflectivity increase is caused by a plasma mirror induced by the subpicosecond excimer laser ablation. In the case of styrene it was found that higher fluence resulted in a higher increase of reflectivity. The reflectivity enhancement was observed, both via its effect on the absorption coefficient as well as through its own photoionization by 2-photon absorption, while increasing the UV absorption of methylmetacrylate by naphthalene doping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003399900212
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Dynamics of excimer laser ablation of thin tungsten films monitored by ultrafast photography (1995)
    Springer
    Applied physics 60 (1995), S. 431-436 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 42.60; 78.90
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  The time course of laser light induced transport of tungsten films from a glass support is followed by ultrafast photography using delayed dye laser pulses. The photographs provide unambiguous evidence that the material transport in the 40–200 mJ/cm2 intensity domain takes place via removal of solid pieces from the film material. These results are consistent with heat flow calculations which predict the overall melting of the metal layer above 380 mJ/cm2. The series of photographs presented give detailed insight into the melting process and have revealed an unexpected in-flight phase separation of solid fracture pieces and molten droplets throughout the 200–900 mJ/cm2 domain. The faster propagating molten droplets form a condensed halo in front of the solid pieces, thereby providing an efficient shield between the processing laser light and the solid phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538765
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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