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  • 1
    Electronic Resource
    Electronic Resource
    Temporal synchronization of independently frequency tunable dual CO2 laser pulses (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3599-3601 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe a new method for the simultaneous emission of two CO2 laser pulses from a single transversely excited atmospheric discharge. The transient gains of the pulsed low-pressure sections of two spatially separate hybrid cavities aligned on the discharge were temporally manipulated to allow low-jitter pulse synchronization. Independently frequency tunable dual laser pulses over arbitrarily selected rotational transitions spanning the available P and R branches of the 9 and 10 μm CO2 laser transitions were obtained, overcoming limitations on possible dual frequency combinations that restricted previous techniques. The result of numerical calculations for the hybrid laser, using a four-level rate equation model, supports the observed delay characteristics and provides a physical basis for understanding the dynamics of the synchronization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354495
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Study of ion activation in the in situ low-temperature laser deposition of superconducting YBa2Cu3O7−δ films (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 1205-1208 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The presence of a pulsed discharge during the reactive deposition of high Tc thin films allows the lowering of substrate temperatures to ∼475 °C for in situ superconducting film deposition. We present the first ion probe analysis to study the role of this pulsed discharge on the excimer laser ablated YBa2Cu3O7−δ plume. The ionic enhancement in the laser-ablated plume, during reactive deposition in the presence of a positively biased ring electrode, is studied both in terms of its extent and temporal characteristics. A significant increase in the forward-directed incidence of oxygen ions on the depositing substrate, following in the wake of the highly directional plume, is demonstrated. The dependence of this ionic enhancement on ambient oxygen pressure and the bias voltage on the ring electrode is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354922
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dual-laser ablation for particulate-free film growth (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 1469-1471 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A novel dual laser ablation process that leads to particulate-free film growth is presented. A pulsed CO2 laser and an excimer (KrF) laser have been spatially overlapped on a Y2O3 target with a temporal delay between the pulses. The particulate density of the films grown by this method are at least three orders of magnitude smaller than the particulate density of a single excimer laser ablated film of similar thickness. In addition, a time-of-flight ion probe study indicates a sixfold enhancement of the plume species kinetic energies under dual-laser ablation. The degree of the plume excitation is observed to depend strongly on the delay between the laser pulses. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113657
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  • 4
    Electronic Resource
    Electronic Resource
    Evidence that blue luminescence of oxidized porous silicon originates from SiO2 (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1436-1438 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have analyzed red and blue luminescence from porous silicon as a function of oxidation parameters and feature dimension determined with an atomic force microscope. We have found correlation between blue luminescence intensity and the increase in feature size caused by oxidation. We have further shown that blue luminescence, is identical, with respect to spectrum and fast decay, to that of high microelectronic quality SiO2 grown on crystalline silicon using dry oxygen plus an organic chlorine compound. Thus, we conclude that blue luminescence originates from SiO2 film rather than from the silicon nanocrystals in the porous material. Intensity enhancement, as compared to SiO2 on crystalline wafers, comes from the gigantic surface area of porous silicon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112973
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  • 5
    Electronic Resource
    Electronic Resource
    Continuously variable distortion-free attenuation of high-power transversely excited atmospheric CO2 laser pulses (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 5294-5298 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new technique for the continuously variable linear attenuation of high-power transversely excited atmospheric (TEA) CO2 laser pulses is reported. The use of a binary gas mixture comprising SF6 as the absorber and helium or argon as the buffer gas causes a significant enhancement in the saturation intensity, thereby allowing saturation-free attenuation of TEA CO2 laser pulses up to 1 MW/cm2. A linearly variable dynamic attenuation range of 0–30 dB, and continuously variable attenuation up to 60 dB in a 10-cm cell length, without spatial or temporal distortion in the attenuated beam is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143442
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    Paper (German National Licenses)
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