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IEEE Journal of Quantum Electronics

Issue 10 • Date October 1976

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Displaying Results 1 - 18 of 18
  • [Front cover and table of contents]

    Publication Year: 1976, Page(s): 0
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    Freely Available from IEEE
  • Acoustic waves and heating due to molecular energy transfer in an electric discharge CO laser

    Publication Year: 1976, Page(s):566 - 574
    Cited by:  Papers (9)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (905 KB)

    This paper summarizes analytical studies and the interpretation of experimental results for the compression and rarefaction waves generated in the cavity of a pulsed CO electric discharge laser. A one-dimensional analysis of acoustic waves is applied to a transversely excited laser. The influences of heating in the cathode fall, heat transfer to the cathode, flow through both the anode and cathode... View full abstract»

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  • [Back cover]

    Publication Year: 1976, Page(s): 0
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    Freely Available from IEEE
  • Stark effect applicable to optically pumped far-infrared laser

    Publication Year: 1976, Page(s):647 - 649
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The effect of low electric field Stark tuning on the absorption of CH3OH gas at the P(12) 9.4-\mu CO2laser line has been studied. At the 220-mtorr CH3OH pressure optimal for CH3OH far-infrared (FIR) laser operation, the line center absorption coefficient increases by a factor of 5 with a Stark field of 2.3 kV/cm. View full abstract»

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  • Direct demodulation of a 10.6µm FM signal with an NH2D stark cell

    Publication Year: 1976, Page(s):646 - 647
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    A new technique for direct demodulation of a 10.6-μm FM signal using a Stark absorption cell is described. A Stark tunable absorption line in NH2D is used to track the time-varying frequency of the incoming FM laser signal using a closed servo loop. The demodulated FM signal is proportional to the feedback voltage applied to the Stark cell. Demodulation at frequencies up to 5 kHz h... View full abstract»

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  • Calculation of the minimum repetition rate of a cavity- dumped four-level laser

    Publication Year: 1976, Page(s):639 - 644
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    Calculations using the rate equations for an ideal 4-level laser system show that there is a minimum frequency below which efficient repetitive cavity dumping of a laser will not be stable. Expressions for the field and inversion variables are derived. Experimental results have been obtained using a folded cavity Nd-YAG laser that is perturbed by an intracavity acoustooptic modulator. The observed... View full abstract»

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  • Experimental and theoretical investigation of the nitrogen laser

    Publication Year: 1976, Page(s):624 - 633
    Cited by:  Papers (104)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1200 KB)

    We have studied several types of flat-plate-transmission-line pulse-excited nitrogen lasers. Experiments were carried over a wide variety of parameters such as laser-tube pressure, charging voltage, laser-tube inductance, transmission-line impedance, and others. A theory of the nitrogen laser is presented which treats the laser as an integrated electrooptical system. The theory is based upon the k... View full abstract»

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  • Derivative measurements of the current-voltage characteristics of double-heterostructure injection lasers

    Publication Year: 1976, Page(s):633 - 639
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    Measurements of the electrical characteristics of double-heterostructure (DH) stripe-geometry AlGaAs junction lasers are reported. We show that the electrical characteristics of these lasers are adequately represented by a resistor in series with a p-n junction characterized by a classical diode equation, I = I_{s} [\hbox{exp } (q V_{j}/\eta kT) - 1] . Device... View full abstract»

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  • The measurement of far-infrared laser gain and loss using a Michelson coupler

    Publication Year: 1976, Page(s):613 - 615
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    It is demonstrated that small values of small-signal gain and total internal losses in far-infrared lasers can, in principle, be determined by measuring the optimum and threshold output coupling coefficients with a Michelson coupler. Experimental results show that although accurate determination of the small-signal gain can be made, only a good approximation of the internal losses is obtained by t... View full abstract»

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  • Theory of modal character, field structure, and losses for semiconductor lasers

    Publication Year: 1976, Page(s):616 - 624
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1000 KB)

    The contemporary semiconductor laser oscillates and radiates power simultaneously in many of the characteristic modes of its cavity, perhaps only a few for the "stripe" laser neat threshold, but hundreds or thousands for power lasers. This article provides a comprehensive theory of the modal characteristics: field structure, polarization, characteristic frequency, radiation pattern, and losses. A ... View full abstract»

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  • Nonlinear optical susceptibilities of solvents

    Publication Year: 1976, Page(s):644 - 646
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    We have measured the nonlinear optical susceptibility coefficient governing self-induced changes in the state of elliptical polarization of a monochromatic beam in 10 common solvents. These are the first such measurements at 1060 nm. We show how our results may be used to estimate self-focusing in these solvents and to clarify other non-linear optical properties. View full abstract»

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  • Multiphoton excitation processes between vibrational states of molecules

    Publication Year: 1976, Page(s):603 - 613
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1040 KB)

    An approximation method has been developed to evaluate the perturbation theory expressions for the probabilities of two- and three-photon transitions among vibrational-rotational levels of diatomic and polyatomic molecules. The sum over intermediate rotational states and the degenerate quantum number M is evaluated for a general case, and the sum over intermedi... View full abstract»

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  • Operation-induced degradation of GaP light-emitting diodes

    Publication Year: 1976, Page(s):574 - 579
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    After GaP red light-emitting diodes (LED's) had been degraded by the forward-biased operation, changes of the light output, the minority carrier lifetime, the photocurrent, and the photocapacitance were measured. There was a linear decreasing relation between the light output and the carrier lifetime. A center which was related to the degradation of the light output was observed by means of photoc... View full abstract»

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  • Pump saturation in molecular far-infrared lasers

    Publication Year: 1976, Page(s):580 - 584
    Cited by:  Papers (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    Precise absorption measurements on vibration-rotation transitions pumping far-infrared (FIR) laser transitions in HCOOH, CH3OH, CH3I and CH3F were carried out using a frequency-stabilized and intensity-controlled CO2laser. Linear absorption coefficients and saturation intensities as a function of pressure are obtained. With the help of a rate equation mo... View full abstract»

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  • LED pumped lithium neodymium tetraphosphate lasers

    Publication Year: 1976, Page(s):584 - 591
    Cited by:  Papers (8)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    Laser action in lithium neodymium tetraphosphate, LiNdP4O12(LNP), crystals, pumped with AlxGa1-xAs electroluminescent diodes, is reported, citing both end- and side-pump configurations. The threshold incident light-emitting diode (LED) intensities at about -30°C are 14.9 W/cm2and 7.2 W/cm2for end and side pump, respectively. Te... View full abstract»

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  • Infrared saturation spectroscopy in p-type germanium

    Publication Year: 1976, Page(s):592 - 597
    Cited by:  Papers (58)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    We investigate spectral changes induced by high-power CO2laser radiation in the direct intervalence band absorption of p-type germanium. Using a model of inhomogeneously broadened two-level systems, we deduce a room-temperature saturation intensity of 4 MW/ cm2from published observations of saturation of this absorption. The applicability of the two-level model to transitions... View full abstract»

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  • New theory of delays in semiconductor lasers

    Publication Year: 1976, Page(s):561 - 565
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A simple model which can explain practically all important features of time delays in GaAs lasers is presented. It assumes only the presence of traps within the forbidden band and considers that the relative movement of quasi-Fermi levels of traps with temperature controls the population of the empty traps which act as saturable absorbers and thereby produce delays. View full abstract»

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  • Lasing characteristics of distributed-feedback GaAs-GaAlAs diode lasers with separate optical and carrier confinement

    Publication Year: 1976, Page(s):597 - 603
    Cited by:  Papers (31)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    The lasing characteristics of separate-confinement-heterostructure (SCH-structure) distributed-feedback (DFB) diode lasers are examined theoretically and experimentally. Wave propagation in five-layer SCH waveguides is analyzed to estimate such parameters as the lasing wavelength, coupling constant, and external quantum efficiency. Spectral and modal behavior are studied in the experiment and comp... View full abstract»

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Aims & Scope

The IEEE Journal of Quantum Electronics is dedicated to the publication of manuscripts reporting novel experimental or theoretical results in the broad field of the science and technology of quantum electronics..

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Aaron R. Hawkins
Brigham Young University