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Quantum Electronics, IEEE Journal of

Issue 9 • Date September 1987

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Displaying Results 1 - 25 of 42
  • [Front cover and table of contents]

    Page(s): 0
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  • Announcing a special issue of the IEEE journal of quantum electronics on the quantum and nonlinear optics of single atoms, ions, and electrons

    Page(s): 1398
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  • Announcing a special issue of the IEEE journal of quantum electronics on quantum well heterostructures and superlattices

    Page(s): 1399
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  • Announcing a special issue of the IEEE journal of quantum electronics on solid-state lasers

    Page(s): 1400
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  • Inroduction to the speacial issue on free-electron lasers

    Page(s): 1468 - 1469
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  • Lasers

    Page(s): 1666
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (208 KB)  

    First Page of the Article
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  • [Back cover]

    Page(s): 0
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  • Free-electron laser research at the University of California, Santa Barbara

    Page(s): 1470 - 1475
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    A review of free-electron laser research at UCSB is presented here. Among the topics included are 1) the development of high-quality electron beam sources based on electrostatic accelerating fields, 2) the analysis of present FEL operating characteristics, 3) the development of advanced FEL concepts, and 5) the utilization of the UCSB FEL in scientific research. View full abstract»

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  • Optical measurements on the UK free-electron laser

    Page(s): 1514 - 1521
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    We describe the data acquisition and optical diagnostic systems of the UK free-electron laser. Measurements of optical gain are reported and the first attempt at oscillation with laser injection is described. View full abstract»

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  • Mode analysis of an open-boundary cerenkov laser in the collective regime

    Page(s): 1633 - 1641
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    The mode analysis of an open-boundary Cerenkov laser is developed in the collective regime. The Cerenkov laser under consideration consists of a relativistic slab electron beam and a dielectric-loaded conducting plane. The beam and the dielectric are assumed to be arbitrary in thickness, with an arbitrary gap allowed between them. For the Cerenkov laser specified above, the dependence of the growth rate upon the electron density of the beam, the beam-dielectric gap, the beam thickness, and the drift velocity of the beam is clarified. In particular, the following results deserve special attention. First, with other parameters kept invariant, the growth rate approaches a constant value for the beam thickness greater than the reactive skin depth of the beam. Second, the growth rate becomes maximum at the drift velocity of the beam characteristic of a particular electromagnetic wave mode with which the space charge wave interacts. As the mode number increases, the characteristic drift velocity shifts to higher values whereas the value of the maximum growth rate decreases. View full abstract»

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  • Multiple bistability and multistability in a fabry-perot laser diode amplifier

    Page(s): 1429 - 1433
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    The experimental observation of multiple bistability is reported, for the first time, in a semiconductor laser system using a laser diode amplifier with a long Fabry-Perot cavity. The condition for realization of multistability in a laser diode amplifier is also studied theoretically in connection with the gain saturation through the rate equation analysis. View full abstract»

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  • Efficiency enhancement in free-electron lasers driven by electromagnetic-wave wigglers

    Page(s): 1590 - 1593
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    A scheme for efficiency enhancement in free-electron lasers which are driven by electromagnetic-wave wigglers is described which employs a tapered axial guide magnetic field. While tapered magnetostatic wiggler designs have been proven to be an effective means of enhancing the efficiency of free-electron lasers, practical difficulties occur in the design of tapered electromagnetic-wave wigglers. For this reason, it is shown that a tapered axial guide field can be used in concert with an electromagnetic-wave wiggler for the purpose of efficiency enhancement. View full abstract»

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  • Baseline conceptual design for high-power FEL ring cavities

    Page(s): 1527 - 1533
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    A baseline conceptual design of a semi-confocal ring resonator for high-power free-electron lasers is presented. An algorithm is developed for identifying the minimum cavity length and element sizes for a given power level. Equations for the exact mirror surfaces are presented and a simple implementation of a single smart mirror stabilization system is proposed. View full abstract»

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  • Generation of electromagnetic radiation from a drifting and rotating electron ring in a rippled magnetic field

    Page(s): 1610 - 1616
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    Coherent electromagnetic radiation from a thin rotating annular ring of relativistic electrons with axial drift, and confined between concentric cylinders comprising a coaxial waveguide, is studied theoretically. The electrons are assumed to move in quasihelical orbits under the combined action of a uniform axial magnetic field and an azimuthally periodic wiggler magnetic field. The instability analysis is based on the linearized Vlasov-Maxwell equations for the perturbations about a self-consistent beam equilibrium. The dispersion equations for the transverse magnetic (TMl,m) modes are derived and analyzed. Coherent radiation occurs near frequencies ω corresponding to the crossing points of the electromagntic modesomega^{2} = c^{2}kmin{parallel}max{2} + omegamin{c}max{2}(l,m)and the beam modesomega = upsilon_{parallel}k_{parallel} + (l + N) Omega_{parallel}where ωcand Ωare the waveguide cutoff frequency and the electron cyclotron frequency, respectively, υparallelis the axial drift velocity of electrons, kis the wavenumber of the electromagnetic wave along the axis, andNis the number of wiggler periods along the azimuth. View full abstract»

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  • FEL mode propagation at saturation

    Page(s): 1534 - 1538
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    We consider the propagation of an electromagnetic wave generated by an FEL after saturation has occurred. Two regimes are considered: one in which the incident wave amplitude is much greater than the wave amplitude generated by the beam, and the other in which the opposite is true. In neither case is there refractive optical guiding. We allow for velocity detuning and wiggler tapering, and calculate the taper design for maintaining synchronism. View full abstract»

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  • A large-orbit nonwiggler free-electron laser

    Page(s): 1646 - 1650
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    A large-orbit nonwiggler free-electron laser (FEL) is proposed that can be expected to operate efficiently with quite low magnetic fields in the range of millimeter and submillimeter waves. A kinetic description as well as the dispersion property is presented. The influences of the initial parameters on the normalized growth rate are numerically analyzed. Nonlinear simulation and discussion are carried out in detail. View full abstract»

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  • Gain in spatially varying optical fields: Applications to high emittance beams and gas dielectric FEL's

    Page(s): 1539 - 1544
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    The conventional free-electron laser small-signal linear gain equation is revised to include the effects of nonuniform optical mode area, finite electron beam emittance, and electron beam energy spread. It is shown for a typical case that the conventional equation overestimates gain by more than 50 percent. The results further show that gain can result from FEL designs with interaction lengths longer than the conventional maximum given by the criterion of accumulated phase shift equal to π. This makes possible a gas-loaded FEL which utilizes a long wiggler and an asymmetric mode to enhance the electron-optical field interaction. Although substantial emittance is induced by scattering, the gas-loaded FEL should have modest gain at wavelengths down to the ultraviolet. View full abstract»

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  • Free-electron lasers with electromagnetic standing wave wigglers

    Page(s): 1578 - 1589
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    A detailed analysis of the electromagnetic standing wave wiggler for free-electron lasers (FEL's) is conducted for both circular and linear wiggler polarizations, following a single-particle approach. After determination of the unperturbed electron orbits in the wiggler field, the single-particle spontaneous emission spectrum and subsequently the gain in the low gain Compton regime (using the Einstein coefficient method) are explicitly calculated. This analysis results in a clear understanding of the resonance conditions and the coupling strength associated with each resonance of this type of FEL. In particular, a striking feature obtained from this investigation is that the electromagnetic standing wave wiggler FEL, under certain circumstances, exhibits a rich harmonic content. This harmonic content is caused by the presence of both the forward and backward wave components of the standing wave wiggler field. In addition, the nonlinear self-consistent equations for this type of FEL are also presented, permitting further investigation of it by the theoretical techniques and numerical codes developed for conventional FEL's. View full abstract»

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  • Phase variation in free-electron laser amplifiers

    Page(s): 1657 - 1665
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    The evolution of the phase of the output radiation of free-electron laser amplifiers is investigated by means of a three-dimensional simulation code. The configuration employed consists of the propagation of a relativistic electron beam through a loss-free cylindrical waveguide in the presence of a helically symmetric wiggler and a uniform axial guide magnetic field. The analysis is fully three dimensional, and a set of model equations is discussed which describes the coupling between an ensemble of electrons and the radiation field of either the TE or TM modes. The model equations are solved numerically, and the output phase is studied with respect to variations in either frequency or electron beam energy. The output phase is found to depend sensitively on the wave frequency within the unstable bandwidth. In addition, the phase stability of the output radiation is discussed as a function of beam energy. Finally, the evolution of the phase for tapered wiggler free-electron lasers is studied. View full abstract»

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  • The tapered hybrid undulator (THUNDER) of the visible free-electron laser oscillator experiment

    Page(s): 1497 - 1513
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    A 5 m tapered hybrid undulator (THUNDER) has been designed and built as part of the Boeing Aerospace Company and Spectra Technology, Inc. visible free-electron laser (FEL) oscillator experiment. The performance goals required of an undulator for a visible oscillator with large extraction are ambitious. They require the establishment of stringent magnetic field quality tolerances which impact design and fabrication techniques. The performance goals of THUNDER are presented. The tolerances resulting from the FEL interaction are contrasted and compared to those of a synchrotron radiation source. The design, fabrication, and field measurements are discussed. The performance of THUNDER serves as a benchmark for future wiggler/undulator designs for advanced FEL's and synchrotron radiation sources. View full abstract»

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  • Analytical theory of four-wave stimulated Brillouin scattering in the saturation regime

    Page(s): 1452 - 1457
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    An analytical solution of the enhanced stimulated Brillouin scattering arranged in a four-wave mixing configuration is presented. The theory includes the effect of pump depletion and is able to demonstrate the reflectivity, efficiency, and field variations in the saturation regime. View full abstract»

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  • Microwave radiation from a low-energy rotating electron beam in an azimuthally periodic magnetic wiggler field

    Page(s): 1605 - 1609
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    The generation of microwave radiation by the interaction of a low-energy rotating electron beam (25 kV, 0.5 A, 5 μs) with an azimuthally periodic magnetic wiggler field has been studied experimentally. Narrow-band radiation has been observed at a frequency of 10.15 GHz at power levels of about 100 W, correspoinding to an electronic efficiency of about 1 percent. Results are in reasonable agreement with theoretical expectations when the electron cyclotron frequency is adjusted to account for a precession in the electron orbits caused by the wiggler field. View full abstract»

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  • Parametric generation within a strontium plasma created by two-photon ionization

    Page(s): 1461 - 1467
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    An experiment has been performed to demonstrate a third-order nonlinear optical effect involving the ground state of the strontium ion. Evidence of strong and slightly tunable parametric generation from a doubly resonant four-wave mixing process is provided when a single-wavelength laser is used to two-photon ionize strontium vapor and simultaneously pump close to the5s rightarrow 6stwo-photon resonance of the ion. This result appears to conform with a semiclassical wave equation description, although there is evidence that a population rate equation analysis will also be necessary if the process is to be modeled more accurately. View full abstract»

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  • Recent results from the Los Alamos free-electron laser

    Page(s): 1476 - 1488
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    In this paper, we review the most recent experimental results of the Los Alamos free-electron laser program. Three major efforts will be described: lasing at improved efficiency over that previously attained, electron beam improvement, and energy recovery. An extraction efficiency of 2 percent was achieved with a wiggler having a 12 percent wavelength taper. The beam has been improved so that limits to its quality are now caused, not by injector performance, but by wake fields related to the high peak currents achieved. Limits to optical power are set by mirror damage. Experiments are described that demonstrate the successful operation of an energy-recovery system. View full abstract»

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  • Frequency response of 1.3µm InGaAsP high speed semiconductor lasers

    Page(s): 1410 - 1418
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    The frequency response of a group of 1.3 μm InGaAsP vapor-phase-regrown buried heterostructure lasers of various cavity lengths is analyzed by fitting the measured response curves. The dependence of resonant frequency f0and damping rateGammaon bias power is determined. The differential gain coefficient for InGaAsP is determined as3.5 times 10^{-16}cm2. The damping rate is found to be proportional to the square of the resonant frequency with a proportionality factor which is independent of device geometry and facet reflectivity. The existence of such a universal relationship betweenGammaand f0and the observed magnitude of the damping rate is explained by the interband relaxation model of nonlinear gain. 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