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IBM Journal of Research and Development

Issue 4 • Date July 1971

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Displaying Results 1 - 13 of 13
  • Experimental Fabrication of One-dimensional GaAs Laser Arrays

    Publication Year: 1971, Page(s):258 - 264
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (664 KB)

    Arrays of GaAs injection lasers have been fabricated for use in an experimental EuO film memory system. Planar-type array structures are formed by diffusing zinc through parallel slots in a diffusion mask on a GaAs wafer. Details of fabrication are given and some initial test results on operating characteristics and life performance are reported. View full abstract»

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  • Fabrication and Properties of Monolithic Laser Diode Arrays

    Publication Year: 1971, Page(s):265 - 271
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (608 KB)

    Monolithic arrays of planar diffused GaAs injection lasers have been fabricated using diffusion masking and photolithography to delineate the junction area. After contact metallization, the arrays are soldered to a sapphire wafer which serves as a heat sink and carries the contacts for each junction. The diodes operate cw at 78 K and the threshold current density. Jth = 700 to 1100 A cm... View full abstract»

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  • Characteristics of GaAs Laser Arrays Designed for Beam Addressable Memories

    Publication Year: 1971, Page(s):272 - 277
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (504 KB)

    Four properties of GaAs laser arrays i.e., the efficiency, junction width, beam spread, and polarization, are important in assessing the usefulness of such devices in beam addressable memory applications. Measurements made on a series of arrays are presented. It is shown that the first two parameters closely approach the characteristics of an idealized array, while the latter two reduce the energy... View full abstract»

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  • Dynamics of a Flashlamp-pumped Rhodamine 6G Laser

    Publication Year: 1971, Page(s):278 - 292
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1076 KB)

    In this paper a rate-equation model is developed for a single-wavelength dye laser. The model is unique in that it accounts for the fact that triplet-state lifetimes are not necessarily very long, as has been previously assumed. This modification makes it possible to analyze more accurately the behavior of dye lasers that are pumped with pulse energies above threshold. Computer solutions of the ra... View full abstract»

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  • Interleaving Slow- and Rapid-data-rate Experiments with a Time-sharing Laboratory Automation System

    Publication Year: 1971, Page(s):293 - 295
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (386 KB)

    A technique is described for accommodating rapid-transfer-rate experiments within an IBM 1800 Time Share Executive (TSX) laboratory automation monitor designed primarily for slow-scanning, low-drift apparatuses, each having the computer control its independent variable. The slow-scan experiments may be delayed for substantial periods to allow break-in by, and dedication of the computer to, those t... View full abstract»

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  • Automation of Data Acquisition in Transient Photoconductive Decay Experiments

    Publication Year: 1971, Page(s):296 - 306
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (806 KB)

    The application of a time-shared IBM 1800 Data Acquisition and Control Computer to data acquisition and reduction in transient photoconductive decay experiments is described. These experiments present an interesting problem in laboratory automation, since they involve high data rates (data periods frequently on the submillisecond scale), a free-running independent variable (time), and a mode of op... View full abstract»

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  • Automation of a Residual Gas Analyzer on a Time-shared Computer

    Publication Year: 1971, Page(s):307 - 312
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (518 KB)

    The automation of a quadrupole mass spectrometer - residual gas analyzer (RGA) on a time-shared IBM 1800 Data Acquisition and Control Computer is described. The RGA, which is used to determine the partial pressures of various gases in a vacuum system, may be operated up to a maximum data rate of about 20,000 points/sec (pps) in an interleaved manner with multiple slow-scanning (≤20 pps) ins... View full abstract»

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  • Equivalent Circuit for Conductivity-Temperature Characteristics of the PdO/Ag-Pd Glaze Resistor

    Publication Year: 1971, Page(s):313 - 317
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (488 KB)

    It is shown that a reasonable fit of experimental to calculated data can be obtained with a simple model of the PdO/Ag-Pd glaze resistor. An equivalent circuit describing the temperature characteristics of the glaze resistor is proposed. The experimental measurements can be reproduced quite adequately over a considerable temperature range, using an equivalent circuit consisting of a semiconductor ... View full abstract»

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  • An Improved Method for Designing Optimal Linear Compensators

    Publication Year: 1971, Page(s):318 - 322
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (498 KB)

    In linear dynamical systems with white Gaussian plant and observation noise and quadratic cost criteria the well-known separation theorem of stochastic control holds. The result is that the determination of the system matrix for the compensator depends on the solution of two Riccati equations, one arising from a deterministic regulator problem and the other from a filtering problem. It is shown in... View full abstract»

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  • Some Numerical Results for Iterative Continuation in Nonlinear Boundary-value Problems

    Publication Year: 1971, Page(s):323 - 327
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (454 KB)

    In this communication we apply certain continuous analog iterative methods to two sample boundary-value problems. We show that the Euler-Newton and the second-order continuation of the Newton method are both useful algorithms for obtaining solutions to classes of nonlinear boundary-value problems. For a convergence analysis we rely upon a number of convergence theorems presented in earlier work. W... View full abstract»

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  • Recent Papers by IBM Authors

    Publication Year: 1971, Page(s):328 - 332
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (507 KB)

    Reprints of the papers listed here may usually be obtained most efficiently by writing directly to the authors. The authors' IBM divisions and locations are identified as follows: ASDD is the Advanced Systems Development Division; CD, Components Division; DPD, Data Processing Division; FED, Field Engineering Division; FSD, Federal Systems Division; GSD, General Systems Division; RES, Research Divi... View full abstract»

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  • Patents Recently Issued to IBM Inventors

    Publication Year: 1971, Page(s):333 - 335
    IEEE is not the copyright holder of this material | PDF file iconPDF (341 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1971, Page(s):336 - 340
    IEEE is not the copyright holder of this material | PDF file iconPDF (352 KB)
    Freely Available from IEEE

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The IBM Journal of Research and Development is a peer-reviewed technical journal, published bimonthly, which features the work of authors in the science, technology and engineering of information systems.

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IBM T. J. Watson Research Center