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  • 1
    Electronic Resource
    Electronic Resource
    Laser induced forward transfer: The effect of support-film interface and film-to-substrate distance on transfer (1992)
    Springer
    Applied physics 54 (1992), S. 170-175 
    Details
    ISSN: 1432-0630
    Keywords: 42.60K ; 78.90 ; 81.15 ; 81.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A comparative study on metal pattern deposition of mm2-area by ablating chromium and titanium thin films from an optically transparent support and transferring the ablated material onto another substrate in close proximity with a single laser pulse (LIFT) is reported. The role of support-film interface and film-to-substrate distance in determining both ablation and transfer is discussed. The sequence of events as a function of processing fluence is interpreted by comparing experimental data with calculated temperature distributions. In the case of poorly adhering films the transfer yield is independent of film-to-substrate distance between 0 and 60 μm throughout the fluence range studied. The transmittance of the ablated areas of well adhering films decreases and that of the corresponding prints increases with increasing distance as evaporation becomes dominant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323905
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Deposition of micrometer-sized tungsten patterns by laser transfer technique (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 3506-3508 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple single-step technique for surface patterning is presented. It is shown that well-adhering micrometer-sized patterns of 100% coverage preserving the shape and dimensions of the ablated area can be deposited by ablating and transferring tungsten thin films in the form of single solid pieces using single pulses of peak power up to 100 mW and 100 μs–1 ms duration from a diode-pumped YAG laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111255
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamics of long-pulse laser transfer of micrometer-sized metal patterns as followed by time-resolved measurements of reflectivity and transmittance (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 2775-2781 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Laser-induced transfer of thin films is a simple single-step technique for surface patterning. In this paper the optimization principles and processes are outlined which led to successful application of the long-pulse laser transfer technique. The critical analysis of experiments on ns-pulse laser transfer of thin films of a variety of metals and the optimization study of the long-pulse laser transfer technique suggests that efficient deposition of high-quality patterns of micrometer dimensions can only be expected when using long laser pulses which not only produce ablation of the thin film pattern in solid phase but also maintain sufficient temperature during transfer and even on landing, to ensure film adherence. In order to identify and understand the different time-dependent processes determining the laser transfer, studies using optical and electron microscopy and static and time-resolved optical measurements were performed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360076
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  • 5
    Electronic Resource
    Electronic Resource
    Excimer laser processing of indium-tin-oxide films: An optical investigation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 6211-6219 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: dc sputtered indium-tin-oxide films have been excimer laser irradiated at subablation threshold fluences (〈510 mJ/cm2). Optical characterization of irradiated products has been performed aiming at resolving the finer structure appearing in the IR–visible absorption spectra, as a function of laser fluence, and assigning such features to specific electronic defects which are produced upon irradiation. Four individual Gaussian-like contributions to absorption spectra are identified at 0.7, 1.0, 1.6, and 2.6 eV, the intensity of which is observed to vary with fluence. Being absent in the original films and emerging in optical spectra at fluences exceeding 300 mJ/cm2, the 2.6 eV contribution is most characteristic to excimer laser processing and is responsible for the darkening of the film. Thermal model calculations reveal that such defects are produced only upon melting and fast resolidification of the film. The evolution of the chemistry actually taking place in the film upon irradiation is followed by x-ray photoelectron spectroscopic analysis. A chemical approach to the production of such defects is proposed in which oxygen displacement in the atomic matrix leads to the formation of neutral ternary complexes of the type SnIn2O4. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360567
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  • 6
    Electronic Resource
    Electronic Resource
    Evolution of implanted carbon in silicon upon pulsed excimer laser annealing (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 969-971 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Formation of epitaxial Si1−yCy substitutional alloy layers on monocrystalline silicon surfaces with y≈1 at. % is reported. The preparation method was carbon ion implantation, followed by KrF excimer laser annealing. Results of Rutherford backscattering (RBS), secondary ion mass spectrometry (SIMS) and infrared absorption analyses are compared. The authors concluded that, up to ∼1 at. % carbon content, the dominant process is nonequilibrium trapping of carbon in substitutional lattice sites upon fast resolidification. Above this concentration the complex carbon redistribution processes are influenced by silicon carbide precipitation in the melt and segregation effects in the near-surface region. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117098
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamics of laser-induced synthesis of ZnSe (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 662-666 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results of a study of laser-induced synthesis of ZnSe from a stack of elemental layers are presented. The process is traced by real-time, simultaneous measurement of both reflectivity and transmission of the irradiated thin films. Numerical solution of the thermal conductivity equation reveals that synthesis may develop at and above a well-defined threshold temperature, which is set by the melting of selenium. Further, it is shown that the whole process comprises three independent successive steps: interlayer mixing (or alloying), chemical reaction (i.e., formation of an amorphous compound), and crystallization of that compound. Among other findings, this analysis shows that large atom transport velocities (in mm/s) are necessary to account for the extremely short duration of the mixing step. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362875
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  • 8
    Electronic Resource
    Electronic Resource
    Pulsed laser deposition of carbon nitride films by a sub-ps laser (2000)
    Springer
    Applied physics 70 (2000), S. 9-11 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.80.Ba; 79.60.-i; 81.15.Fg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. CNx (0.01〈x〈0.06) films were grown from a graphite target by pulsed laser deposition in a low-pressure nitrogen environment at room temperature, using a sub-psultraviolet laser. With increasing nitrogen pressure from 3×10-2 to 0.6 mbar the nitrogen content of the films increases monotonously, as determined by X-ray photoelectron spectroscopy. Raman spectroscopy reveals that the films consist predominantly of highly amorphous carbon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050003
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  • 9
    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
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Diamond-like carbon layer formation on graphite by excimer laser irradiation (1998)
    Springer
    Applied physics 66 (1998), S. 659-661 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.80.B; 61.16.C; 78.30; 68.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 2 fluence results in the formation of a thin hydrogen-free diamond-like carbon (DLC) film on the surface. The density of the laser-formed DLC layer is approximately 2.8 g/cm3, as calculated from area-selective Raman spectroscopy and atomic force microscopic (AFM) measurements. The proportion of the sp3 hybrid states of carbon is estimated to be approximately 50%. Annealing in air at 650 °C for 30 min recovers the graphite structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050729
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