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  • 1
    Electronic Resource
    Electronic Resource
    Comparative study between the electric and magnetic properties and the grain boundary structure of YBa"2Cu"3O"7"-"xAg"2O superconductors
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 162-164 (1989), S. 1179-1180 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(89)90642-4
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Enhanced levitation properties in melt-textured YBCO samples grown without temperature gradient
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 233 (1994), S. 301-310 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(94)90756-0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    20-ps timing resolution with single-photon avalanche diodes (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1104-1110 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Single photon avalanche diodes (SPADs) are avalanche photodiodes specifically designed for reverse bias operation above the breakdown voltage and used for detecting single optical photons. A new silicon epitaxial device structure was designed to give improved timing performance with respect to previous SPADs. Extensive tests were carried out in order to establish the timing resolution of the device in time correlated photon counting (TCPC). The timing resolution of the SPAD in terms of its full-width at half-maximum (FWHM) contribution to the overall instrumental response width is 20 ps with the detector cooled to −65 °C, and 28 ps at room temperature. This is the highest resolution so far reported for solid-state single-photon detectors. In vacuum tubes, comparable results are obtained only with special microchannel-plate photomultipliers (MCP-PMT). Results from time-resolved photoluminescence measurements in GaAs demonstrate the power of the TCPC technique when used with the new SPAD detector. With the excellent timing resolution of the SPAD and the well-known advantages of TCPC systems (high sensitivity, linearity, etc.), various applications are foreseen in areas so far dominated by streak cameras.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140324
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Performance comparison of a single-photon avalanche diode with a microchannel-plate photomultiplier in time-correlated single-photon counting (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1148-1152 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A silicon single-photon avalanche diode (SPAD) detector and a proximity-focus-type microchannel-plate photomultiplier tube (MCP-PMT) are compared with respect to their performance in time-correlated single-photon counting (TCSPC) applications. A solution of pinacyanol (1,1'-diethyl–2,2'-carbocyanine) in ethanol, which is used as a test substance with short-lived fluorescence, is excited at 620 nm with a synchronously pumped, cavity-dumped rhodamine 6G dye laser. Deconvolution analysis of the fluorescence decay with a biexponential decay model gives excellent fits to the experimental data recorded with any one of the detectors. The fluorescence lifetimes for the dominating decay component are 13±2 and 11±2 ps as measured at 635 nm with the SPAD detector and the MCP-PMT, respectively. The excellent agreement of these values and the quality of the fits show that the SPAD detector as well as the MCP-PMT can resolve fluorescence decay time constants of the order of 10 ps. This is significantly better than what had been expected on the basis of the instrumental response widths of 70 ps (FWHM) with the SPAD detector and 50 ps (FWHM) with the MCP-PMT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140258
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Improving the performance of commercially available Geiger-mode avalanche photodiodes (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 163-167 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The resolution of Geiger-mode avalanche photodiodes in single photon timing is shown to be dependent on the diameter of the illuminated area. For the RCA C30902S device at room temperature, an improvement in the resolution from 460 to 320 ps FWHM (full width at half maximum) is demonstrated by concentrating the light in a 50-μm-diam spot in the center of the active area. The physical reasons that can justify such a result are dealt with. The resolution curve is affected by a tail due to diffusion effects. The tail shape and amplitude are investigated for different positions of the light spot on the active area and shown to be strongly position dependent. An analysis of the device structure accounts for this effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142300
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Improving the performance of ultrafast microchannel-plate photomultipliers in time-correlated photon counting by pulse pre-shaping (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1072-1075 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: With ultrafast microchannel-plate (MCP) photomultipliers that produce subnanosecond pulses, the commercially available circuit modules do not provide a correct constant-fraction trigger (CFT) operation. This has a detrimental effect on the resolution obtained in time-correlated photon counting experiments. In order to circumvent this CFT limitation and better exploit the ultrafast MCP performance, a simple pulse-shaping filter has been devised and experimented with. The filter can be interposed between the MCP output and the input of any commercial CFT module, without modifying the latter. The benefit of the filter is confirmed by the experimental results. With MCP samples that produced awkward resolution curves with satellite peaks and other irregular features, the introduction of the filter regularized and narrowed the curve. Also with a setup having fairly good performance, the introduction of the filter was advantageous: the full width at half maximum (FWHM) resolution improved from 75 to 55 ps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141426
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Photoluminescence lifetime microscope spectrometer based on time-correlated single-photon counting with an avalanche diode detector (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 11-22 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A photoluminescence lifetime microscope spectrometer (PLμS) based on time-correlated single-photon counting (TCSPC) with a single-photon avalanche diode (SPAD) detector was developed for the investigation of the microscopic spatial fluctuations of the minority-carrier lifetime and other material parameters in gallium arsenide (GaAs) and related compound semiconductors. The high sensitivity of the TCSPC technique is essential for time-resolved photoluminescence (TRPL) measurements with a spatial resolution of the order of a few micrometers. The spatial resolution of the PLμS is compatible with the diffusion length in GaAs substrates or the dimensions of small, highly integrated GaAs devices. The PLμS is the first instrument of its kind based entirely on solid-state components, i.e., a gain-switched diode laser for pulsed excitation and an avalanche diode for single-photon detection. It is explained why, in samples dominated by nonradiative linear recombination, the relatively large excitation pulse width of the diode laser compared to a synchronously pumped dye laser does not adversely affect the timing accuracy of the measured decay time constants. It was previously shown that, by using nonlinear least-squares iterative convolution analysis, a TCSPC instrument with an instrumental response width of 70 ps (FWHM) is capable of accurately measuring fluorescence decay time constants down to 10 ps with ±2 ps timing accuracy. The PLμS is designed to take full advantage of the high repetition rates, up to 100 MHz, typical for mode-locked laser sources or gain-switched diode lasers. The data-acquisition time for a complete decay curve containing typically several hundred thousand counts is thus reduced to a few seconds. Hence, the PLμS is, in principle, suitable for scanning operation and topographical imaging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141885
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    New double constant-fraction trigger circuit for locking on laser pulse trains up to 100 MHz (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1004-1009 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe a new technique for picosecond synchronization on a 80-MHz mode-locked laser. An implementation of such technique is described, and experimental results are presented. Better than 30-ps FWHM synchronization jitter is demonstrated, with an optical pulse amplitude fluctuation of a decade. Such results confirm that single-photon-timing experiments with picosecond resolution are possible by using high-repetition-rate light pulses (i.e., without any cavity dumper).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141467
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    50 Hz current-dependent losses of Bi2Sr2Ca1Cu2O8+x/Ag wires (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 192-194 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 50 Hz current-dependent loss measurements were carried out at 4.2 K on short straight samples of Bi2Sr2Ca1Cu2O8+x /Ag wires having high critical current densities of up to 1.5×104 A/cm2 at 26 T. The ac power losses vary proportional to the square of the transport current which is not consistent with the simple Bean model. On the other hand the losses depend linearly on the frequency of the alternating current which would be compatible with hysteresis as the dominant loss mechanism. Loss values are found to be rather high and are not strongly influenced by bias magnetic fields up to 1 T. Several effects may contribute to the loss enhancement and its current dependence, however the reason for this behavior remains to be clarified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103955
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    The dependence of transformer ratio on the shaper weighting function in transformer-coupled low noise preamplifiers
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 260 (1987), S. 187-194 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-9002(87)90402-5
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    Paper (German National Licenses)
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