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IBM Journal of Research and Development

Issue 5 • Date Sept. 1979

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Displaying Results 1 - 15 of 15
  • Contributions of IBM to Laser Science—1960 to the Present

    Publication Year: 1979, Page(s):476 - 489
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1196 KB)

    IBM's role in the discovery of new lasers and in the development of their scientific potential is described. A brief survey is presented of laser-related projects conducted within IBM's Research Division laboratories at Yorktown Heights, NY, San Jose, CA, and Zurich, Switzerland. View full abstract»

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  • Systematic Behavior in Alkaline Earth Spectra: A Multichannel Quantum Defect Analysis

    Publication Year: 1979, Page(s):490 - 503
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1066 KB)

    “Two-electron” atoms are more complex than “one-electron” atoms because of electron-electron interactions. This leads to spectra that are not well understood. Using multiple photon excitation and ionization detection, we have extensively studied Rydberg series of states in Ca, Sr, and Ba. The spectroscopic data were interpreted by using multichannel quantum defect theor... View full abstract»

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  • Two-Photon Coherent Transients

    Publication Year: 1979, Page(s):504 - 516
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (986 KB)

    Two-photon nutation, free-induction decay, and population inversion by adiabatic rapid passage have been studied in NH3. These effects are easily visualized with a vector model. Relaxation time T1 and T2 have been measured. View full abstract»

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  • Cooperative Emission of an Excited Monolayer into Surface Plasmons

    Publication Year: 1979, Page(s):517 - 526
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (706 KB)

    The cooperative emission of an excited molecular monolayer into surface plasmons of a metallic substrate is described. The effect arises from the very strong coupling of an electronically excited molecule to surface plasmons at distances that are short compared to the wavelength of the electronic transition. Strong resonant enhancement of this excited molecule-surface plasmon interaction occurs fo... View full abstract»

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  • Subnanosecond Optical Free-Induction Decay

    Publication Year: 1979, Page(s):527 - 533
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (576 KB)

    A novel form of laser frequency switching is devised that extends coherent optical transient studies to a 100-picosecond time scale, the measurements being performed in real time. Free-induction decay (FID) on a subnanosecond time scale reveals new features, such as a first-order FID that dephases with the inhomogeneous dephasing time T2* and interferes with the well-known nonlinear FID... View full abstract»

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  • One- and Two-Photon Laser Photochemistry in Organic Solids

    Publication Year: 1979, Page(s):534 - 546
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (962 KB)

    The criteria for site-selective low-temperature laser photochemistry in organic solids are discussed within a general framework that includes both one- and two-photon photochemical reaction schemes. We identify requirements for the use of this photochemistry in photochemical hole burning applications such as high-resolution spectroscopy and the study of low-temperature reaction mechanisms. The one... View full abstract»

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  • Photochemical Hole Burning in Free-Base Porphyrin and Chlorin in n-Alkane Matrices

    Publication Year: 1979, Page(s):547 - 555
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (614 KB)

    In inhomogeneously broadened lines, selective photochemistry with narrow band lasers leads to photochemical hole burning. We describe this phenomenon with particular reference to free-base porphyrin (H2P) and chlorin molecules in n-alkane matrices at low temperatures. It is shown that hole burning, which is permanent at low temperatures, can be used to study homogeneous optical dephasin... View full abstract»

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  • Time-Resolved Infrared Spectral Photography: A New Technique

    Publication Year: 1979, Page(s):556 - 575
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1490 KB)

    A new technique for photographic or multichannel photoelectric recording of broad band infrared absorption spectra with approximately 5-ns time resolution is described. The technique is based on resonant four-wave mixing in alkali metal vapors. View full abstract»

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  • (GaAl)As Laser Requirements for Local Attached Data Link Applications

    Publication Year: 1979, Page(s):576 - 584
    Cited by:  Papers (2)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (778 KB)

    The characteristics of (GaAl)As double heterostructure stripe contact injection lasers as they relate to applications in fiber optic data transmission systems are reviewed. The laser characteristics are treated as optical, electrical, thermal, and mechanical interfaces to the system in order to emphasize the necessity of designing devices as a functional part of a system or subsystem. It is conclu... View full abstract»

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  • GaAs/(GaAl)As Laser Technology

    Publication Year: 1979, Page(s):585 - 595
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (855 KB)

    This paper is a review of some recent work at IBM on semiconductor injection lasers. An automated system has been built and used for the epitaxial growth of laser material and we describe testing procedures used to characterize this material. Results on the degradation of these lasers at high continuous wave optical power are also presented. View full abstract»

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  • Molecular Beam Laser-Induced Fluorescence Studies of Chemical Reactions

    Publication Year: 1979, Page(s):596 - 603
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (682 KB)

    Crossed molecular beam experiments that use laser-induced fluorescence spectroscopy as the detector allow measurements of the internal state distribution in the products of chemical reactions studied under well-controlled single-collision conditions. This technique provides direct information on the chemical dynamics and the intermolecular potential surfaces. Application to the reactions H + NO View full abstract»

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  • Forced Rayleigh Scattering

    Publication Year: 1979, Page(s):604 - 614
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (831 KB)

    Forced Rayleigh scattering (FRS) is a light scattering technique used to investigate light-induced grating structures that decay in a relaxational or almost relaxational manner. Such gratings can be created by interference and absorption of two pump beams and probed by a third beam, usually of different frequency. They may consist of spatially varying excited state populations with picosecond life... View full abstract»

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  • Recent papers by IBM authors

    Publication Year: 1979, Page(s):615 - 620
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (525 KB)

    Reprints of the papers listed here may usually be obtained by writing directly to the authors. The authors' IBM divisions are identified as follows: CHQ is Corporate Headquarters; DPD, Data Processing Division; DSD, Data Systems Division; FED, Field Engineering Division; FSD, Federal Systems Division; GPD, General Products Division; GSD, General Systems Division; OPD, Office Products Division; RES... View full abstract»

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  • Recent IBM patents

    Publication Year: 1979, Page(s): 621
    IEEE is not the copyright holder of this material | PDF file iconPDF (116 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1979, Page(s):622 - 624
    IEEE is not the copyright holder of this material | PDF file iconPDF (279 KB)
    Freely Available from IEEE

Aims & Scope

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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Editor-in-Chief
Clifford A. Pickover
IBM T. J. Watson Research Center