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  • 1
    Electronic Resource
    Electronic Resource
    Thermal and mechanical coupling between successive pulses in KrF-excimer-laser ablation of polyimide (1996)
    Springer
    Applied physics 62 (1996), S. 203-211 
    Details
    ISSN: 1432-0630
    Keywords: 81.40 ; 81.60 ; 72.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Multiple-shot effects in laser processing and ablation of polyimide are examined and are found to be the dominant phenomena for processes involving several hundreds or thousands of pulses. For fluences less than 260 mJ/cm2, it was found that it is impossible to cut through 75 μm polyimide foils for an arbitrarily large number of excimer pulses even though this fluence is more than ten times the single-shot ablation threshold. The halt in etching is due to the formation, over a number of shots, of a robust carbon matrix with a deep surface roughness which is also responsible for laser-induced electrical conductivity. The effect of thermal coupling between successive shots is shown to be a dominant factor in determining the electrical properties of the carbon layer. Differences in electrical conductivity of up to 12 orders of magnitude were found for only small differences in repetition rate. Transmission electron microscopy revealed the changes in microstructure responsible for the dramatic differences in electrical properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575082
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  • 2
    Electronic Resource
    Electronic Resource
    Modification of polyimide surfaces using intense proton pulses (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3523-3530 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High intensity proton pulses of 50 ns length were used to modify polyimide surfaces. The deposited energy and power density were similar to the corresponding experiments with UV laser pulses. Due to the constant range of the protons a well-defined layer of about 1.5 μm is heated. The induced optical absorption, electrical conductivity, and the ablation were studied. The results are consistently explained by a thermal model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354529
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  • 3
    Electronic Resource
    Electronic Resource
    Three-halves harmonic emission from femtosecond laser produced plasmas (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 3197-3200 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of three-halves harmonic radiation (3ω0/2) produced by femtosecond, Ti:sapphire laser pulses (≤2×1017 W/cm2) in long density scale length plasmas generated from solid aluminum targets are presented. The 3ω0/2 emission yield shows excellent agreement with theories of the two-plasmon decay instability in the predominantly linear regime. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1493794
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  • 4
    Electronic Resource
    Electronic Resource
    Two-photon photoconductivity in SiC photodiodes and its application to autocorrelation measurements of femtosecond optical pulses (1997)
    Springer
    Applied physics 65 (1997), S. 295-297 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.60.By; 42.65.-k; 42.79.Fm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050274
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  • 5
    Electronic Resource
    Electronic Resource
    Frequency resolved optical gating in the UV using the electronic Kerr effect (1996)
    Springer
    Applied physics 63 (1996), S. 485-489 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.60.By; 42.65.-k; 42.79.Fm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract.  A phase-sensitive single-shot autocorrelator (FROG) for the UV spectral region based on the electronic Kerr effect is demonstrated. Since the Kerr shutter technique leads to a third-order autocorrelation function, information about pulse asymmetries and pulse structures along with the temporal phase can be obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01828945
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  • 6
    Electronic Resource
    Electronic Resource
    Control of the photodissociation of CsCl (2000)
    Springer
    Applied physics 71 (2000), S. 267-276 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.50.-p; 33.80.Eh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. A femtosecond UV laser pulse is used to resonantly excite CsCl molecules from the ionically bound ground state to the first excited repulsive state. The excitation leads to the dissociation of CsCl. After a certain time delay a visible (VIS) femtosecond laser pulse interrupts the dissociation process by resonantly de-exciting the molecule back to the ground state. According to the Tannor–Rice control scheme, the fraction of dissociated CsCl molecules is controlled by changing the delay time between the two fs laser pulses. The processes involved are investigated theoretically and experimentally. Based on the results, a self-learning system has been realized, which is able to control the dissociation without any a priori knowledge of the molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000397
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  • 7
    Electronic Resource
    Electronic Resource
    Ultraviolet-laser-induced permanent electrical conductivity in polyimide (1993)
    Springer
    Applied physics 56 (1993), S. 275-281 
    Details
    ISSN: 1432-0630
    Keywords: 72.20 ; 72.60 ; 81.60.Jw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract When polyimide (Kapton) is irradiated by a krypton fluoride (KrF) laser, an increase of the electrical conductivity of up to 16 orders of magnitude is observed. In the high conduction regime, the resistivity is about 0.1 Ω cm, the current voltage characteristic is ohmic and the contacts of gold and silver with the irradiated conducting polymer are also ohmic. The conduction mechanism is phonon-assisted variable range hopping, evident from the observed temperature and electric field dependence of the resistivity at low conductivities. The laser-induced conductivity depends on the ambient atmosphere during irradiation. Transmission spectroscopy in the visible region and infrared Fourier transform spectroscopy have been used to characterize the material. A thermal mechanism is proposed for the formation of conducting polyimide, by excimer-laser irradiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00539487
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal and mechanical coupling between successive pulses in KrF-excimer-laser ablation of polyimide (1996)
    Springer
    Applied physics 62 (1996), S. 203-211 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.40; 81.60; 72.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Multiple-shot effects in laser processing and ablation of polyimide are examined and are found to be the dominant phenomena for processes involving several hundreds or thousands of pulses. For fluences less than 260 mJ/cm2, it was found that it is impossible to cut through 75 μm polyimide foils for an arbitrarily large number of excimer pulses even though this fluence is more than ten times the single-shot ablation threshold. The halt in etching is due to the formation, over a number of shots, of a robust carbon matrix with a deep surface roughness which is also responsible for laser-induced electrical conductivity. The effect of thermal coupling between successive shots is shown to be a dominant factor in determining the electrical properties of the carbon layer. Differences in electrical conductivity of up to 12 orders of magnitude were found for only small differences in repetition rate. Transmission electron microscopy revealed the changes in microstructure responsible for the dramatic differences in electrical properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575082
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  • 9
    Electronic Resource
    Electronic Resource
    A thermal model for the ablation of polymers by lasers and high intensity ion pulses (1996)
    Springer
    Applied physics 63 (1996), S. 13-17 
    Details
    ISSN: 1432-0630
    Keywords: 72.20 ; 72.60 ; 81.60.Jw
    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 results for the ablation of polymers by High-Intensity Pulsed Ion Beams (HIPIB) as well as by laser pulses of different wavelengths and pulse widths are discussed. A thermal model is proposed that reproduces all available experimental data. An Arrhenius type relation is assumed for the ablation velocityw(T) =w 0 exp (−T 1/T). Once the two parametersw 0 andT 1 are known for a certain polymer the model allows one to predict the ablation rate as a function of laser wavelength, fluence, and pulse width and for HIPIB pulses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01579741
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  • 10
    Electronic Resource
    Electronic Resource
    A thermal model for the ablation of polymers by lasers and high intensity ion pulses (1996)
    Springer
    Applied physics 63 (1996), S. 13-17 
    Details
    ISSN: 1432-0630
    Keywords: PACS72.20; 72.60; 81.60.Jw
    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 results for the ablation of polymers by High-Intensity Pulsed Ion Beams (HIPIB) as well as by laser pulses of different wavelengths and pulse widths are discussed. A thermal model is proposed that reproduces all available experimental data. An Arrhenius type relation is assumed for the ablation velocity $w(T) = w_0 \exp{(-T_1/T)}$ . Once the two parameters $w_0$ and $T_1$ are known for a certain polymer the model allows one to predict the ablation rate as a function of laser wavelength, fluence, and pulse width and for HIPIB pulses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01579741
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