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  • 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
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Transient optical properties of excimer-laser-irradiated polyimide (1995)
    Springer
    Applied physics 61 (1995), S. 547-551 
    Details
    ISSN: 1432-0630
    Keywords: 42.80 ; 42.10 ; 81.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Reflectivity, transmission and scattering measurments in ArF (193 nm) excimer-laser irradiated polyimide are reported. The time dependence of transient changes in all three quantities were measured together for the first time, confirming a transient refractive-index change in the first 150 ns after irradiation. The relaxation time of the effect was measured and found to consist of both a fast and slow component similar to that previously reported in acoustic wave measurements. The fast decay in about 60 ns and the slow decay is 115 ns. Several potential mechanisms are examined which may explain the result.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01540257
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Transient optical properties of excimer-laser-irradiated polyimide (1995)
    Springer
    Applied physics 61 (1995), S. 575-578 
    Details
    ISSN: 1432-0630
    Keywords: 42.10 ; 81.60 ; 71.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Experiments involving time-resolved scattering and transmission in ArF (193 nm) excimer-laser-irradiated polyimide are reported. Scattering experiments determined that constituents of the carbon layer responsible for laser-induced electrical conductivity form between 150 and 400 ns after the excimer pulse. Transmission experiments indicate that absorbing carbon is present before the formation of organized crystallites responsible for electrical conduction and scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01542866
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Repigmentation of localized vitiligo with the xenon chloride laser (2001)
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 144 (2001), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2133.2001.04248.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Transient optical properties of excimer–laser–irradiated polyimide II. Carbon-cluster scattering (1995)
    Springer
    Applied physics 61 (1995), S. 575-578 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 42.10; 81.60; 71.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Experiments involving time-resolved scattering and transmission in ArF (193 nm) excimer-laser-irradiated polyimide are reported. Scattering experiments determined that constituents of the carbon layer responsible for laser-induced electrical conductivity form between 150 and 400 ns after the excimer pulse. Transmission experiments indicate that absorbing carbon is present before the formation of organized crystallites responsible for electrical conduction and scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01542866
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Comparative time-resolved study of solid-state and liquid ablation of polyethylene-glycol 1000: temperature, viscosity and surface tension dependence (2000)
    Springer
    Applied physics 71 (2000), S. 315-318 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 64.70; 65.70.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Comparative study of solid and liquid phase ablation on the same sample by time-resolved investigations is presented in this paper. Polyethylene-glycol (PEG) 1000 having relatively low melting point (35 °C) was used in our experiments. By varying the sample temperature in the 20–80 °C range we could study the ablation mechanism in both solid and liquid (below and above the melting point) state of matter. An ArF excimer laser (λ=193 nm, FWHM=20 ns) was used for ablation at 1.95 J/cm2 fluence. Ablation processes were observed by transmission fast photographic arrangement. It was demonstrated that plasma development and expansion (primer ablation, in 0–50 ns time range), formation and propagation parameters of shock wave and contact front did not depend on sample temperature and state of matter. The secondary material ejection (between 1–100 μs) showed a strong temperature dependence. Material ejection in the case of solid target occurred in the form of dense material cloud, and in the form of splashing for liquid (molten) sample. The ejection velocity of splashed jets depended on the sample temperature, significantly. This can be due to the change of molten PEG 1000 viscosity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390000547
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    Paper (German National Licenses)
    Fulltext
  • 7
    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
  • 8
    Electronic Resource
    Electronic Resource
    Transient optical properties of excimer-laser-irradiated polyimide I. Refractive index (1995)
    Springer
    Applied physics 61 (1995), S. 547-551 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 42.80; 42.10; 81.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Reflectivity, transmission and scattering measurments in ArF (193 nm) excimer-laser irradiated polyimide are reported. The time dependence of transient changes in all three quantities were measured together for the first time, confirming a transient refractive-index change in the first 150 ns after irradiation. The relaxation time of the effect was measured and found to consist of both a fast and slow component similar to that previously reported in acoustic wave measurements. The fast decay in about 60 ns and the slow decay is 115 ns. Several potential mechanisms are examined which may explain the result.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050238
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Direct generation of sub-nanosecond pulses in a high-pressure miniature excimer laser (1992)
    Springer
    Applied physics 54 (1992), S. 513-515 
    Details
    ISSN: 1432-0649
    Keywords: 42.55.Gp ; 42.60.By
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Direct generation of subnanosecond pulses in a 9.0 cm discharge-length high-pressure XeCl laser is reported. The shortest pulse obtained was 670 ps (FWHM) with an energy of 1.2 mJ corresponding to 1.8 MW peak power.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325518
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    Paper (German National Licenses)
    Fulltext
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