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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]

    Publication Year: 1987 , 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

    Publication Year: 1987 , Page(s): 1398
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    Freely Available from IEEE
  • Announcing a special issue of the IEEE journal of quantum electronics on quantum well heterostructures and superlattices

    Publication Year: 1987 , Page(s): 1399
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    Freely Available from IEEE
  • Announcing a special issue of the IEEE journal of quantum electronics on solid-state lasers

    Publication Year: 1987 , Page(s): 1400
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    Freely Available from IEEE
  • Inroduction to the speacial issue on free-electron lasers

    Publication Year: 1987 , Page(s): 1468 - 1469
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  • Lasers

    Publication Year: 1987 , Page(s): 1666
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    First Page of the Article
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  • [Back cover]

    Publication Year: 1987 , Page(s): 0
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  • Phase variation in free-electron laser amplifiers

    Publication Year: 1987 , Page(s): 1657 - 1665
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2536 KB)  

    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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  • Regenerative gain in a Raman free-electron laser oscillator

    Publication Year: 1987 , Page(s): 1594 - 1604
    Cited by:  Papers (3)
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    A parametric study of gain in a millimeter-wave Raman free-electron laser oscillator and comparisons to linear theory are carried out. The intense (1 kA/cm2), relativistic (600-800 keV), cold [ (\delta \gamma /\gamma )_{\parallel} < 1 percent] electron beam employed is guided by a 9.45 kG magnetic field through a 1.45 cm period, 49.5 cm long uniform undulator. Operation at < 1 kG pump field results in a < 10 percent electron quiver velocity ( \upsilon _{\perp }/\upsilon _{\parallel} ) velocity. The laser power output has been mea sured at ∼ 3 MW corresponding to an efficiency of 4 percent, and tunability in the 90-170 GHz range has been achieved with a narrow linewidth ( \Delta \lambda /\lambda \leq 1 percent). Using a new technique, linear small-signal growth rates have been unfolded from the oscillator startup delays. Excellent agreement is found with three-dimensional small-signal calculations for both the spatial growth rate and the resonance frequency. One-dimensional theory was found to predict shorter wavelength laser output than that observed. View full abstract»

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  • Effect of electron beam temperature on the gain of a collective free-electron laser

    Publication Year: 1987 , Page(s): 1617 - 1620
    Cited by:  Papers (2)
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    At sufficiently low beam currents, electron beam temperature effects cause the gains of collective (Raman) regime free-electron lasers to be lower than the predictions of cold beam theory. This gain degradation has been measured as a function of the beam current, the wiggler magnetic field, and the interaction frequency. The measurements are used to estimate the electron beam temperature, and the estimated temperature is close to the temperature predicted by numeric simulations. View full abstract»

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  • Optical cavities for visible free-electron laser experiments

    Publication Year: 1987 , Page(s): 1522 - 1526
    Cited by:  Papers (2)
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    The current Boeing/Spectra Technology visible FEL oscillator experiment requires an optical cavity of unusual size. Due to the long narrow gain medium provided by the wiggler and electron beam, a cavity of near concentric geometry is used. The sensitivity of such near concentric FEL cavities to misalignment increases with increasing size and decreasing wavelength. As a result, an actively stabilized set of cavity mirrors is required. In addition, the micropulse temporal structure of an RF linac-driven FEL requires that the absolute length of the cavity be maintained to ensure that the light within the cavity overlaps individual micropulses. This paper describes the 55.4 m cavity with its associated stabilization and control system being used in these experiments. View full abstract»

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  • Plasma wave wigglers for free-electron lasers

    Publication Year: 1987 , Page(s): 1571 - 1577
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2216 KB)  

    We explore the possibility of using a relativistic plasma density wave as a wiggler for producing free-electron laser radiation. Such a wiggler is a purely electric wiggler with frequency ωp(plasma frequency) and wavenumber kp. If an electron beam is injected parallel to the plasma wave wavefront, it is wiggled transversely with an apparent wiggler wavelength \lambda _{w} = 2\pi c/\omega _{p} . Using plasma densities in the 1017(cm-3) range, λwof order 100 μm may be obtained, thereby permitting generation of short wavelength radiation with modest energy beams. The effective wiggler strength a_{w} = eA/mc^{2} \sim 0.5 can be extremely large. We discuss the excitation methods for such wigglers and examine the constraints imposed by the plasma medium on FEL gain in this scheme. View full abstract»

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  • Comparison of Nd 1.06 and 1.33 µm operation in various hosts

    Publication Year: 1987 , Page(s): 1434 - 1451
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5480 KB)  

    Performances of Nd in various hosts including Nd:YAG, Nd:YLF, Nd:BEL, and Nd:Cr:GSGG were characterized and compared for operation on the nominal 1.06 μm and 1.33 μm transitions. Comparison included continuous mode operation, normal mode operation, Q -switched operation, and gain measurements. Continuous lasing of Nd:Cr:GSGG under lamp pumping is reported for what may be the first time. Characterization included operation with different mirror reflectivities to obtain the internal losses, measurement of the upper laser level lifetime, measurement of the beam quality of the lasers operating under nominally similar circumstances, and measurement of the wavelength. These measurements should provide a comparison of the various Nd hosts under similar circumstances for a wide variety of operational modes and at both wavelengths of interest. View full abstract»

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

    Publication Year: 1987 , 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 the 5s \rightarrow 6s two-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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  • Optical guiding in a Raman free-electron laser

    Publication Year: 1987 , Page(s): 1651 - 1656
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1552 KB)  

    A theoretical and computational study of optical guiding in a Raman free-electron laser (of wavelength ≃ 2 mm) is given. A set of basic dynamical equations is given, including the effects of space-charge and two-dimensional diffraction, both with and without a waveguide. The results from a computer code based on these equations are reported, showing optical guiding. An experiment is proposed in the Columbia free-electron laser to measure optical guiding. View full abstract»

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  • Frequency response of 1.3µm InGaAsP high speed semiconductor lasers

    Publication Year: 1987 , Page(s): 1410 - 1418
    Cited by:  Papers (128)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2536 KB)  

    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 rate \Gamma on bias power is determined. The differential gain coefficient for InGaAsP is determined as 3.5 \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 between \Gamma and 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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  • FEL mode propagation at saturation

    Publication Year: 1987 , Page(s): 1534 - 1538
    Cited by:  Papers (3)
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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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  • Gain in spatially varying optical fields: Applications to high emittance beams and gas dielectric FEL's

    Publication Year: 1987 , Page(s): 1539 - 1544
    Cited by:  Papers (6)
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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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  • The gain calculation of media and electrostatic free-electron lasers by the madey theorem

    Publication Year: 1987 , Page(s): 1642 - 1645
    Cited by:  Papers (3)
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    The Madey theorem has been used to calculate the small-signal gain of a planar magnetic wiggler FEL and optical klystron. The analysis in this paper shows that the Madey theorem can also be applied to media FEL's, i.e., Cerenkov and transition radiation FEL's, as well as electrostatic FEL's. Here we use the Madey theorem to calculate the small-signal gain of these two kinds of FEL's. View full abstract»

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  • The effects of harmonic wiggler field components on free-electron laser operation

    Publication Year: 1987 , Page(s): 1552 - 1557
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1728 KB)  

    Harmonics are generated in free-electron lasers as a result of the nonuniform axial motion of the electrons. These motions can be manipulated through the addition of harmonic wiggler fields. A mathematical formalism is developed that describes the effects of harmonic wiggler fields on the fundamental and harmonic coupling coefficients. An examination of how these fields can be used to alter the harmonic power output of a free-electron laser is conducted. View full abstract»

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  • High efficiency energy conversion of microwave to optical power within a free-electron laser oscillator

    Publication Year: 1987 , Page(s): 1545 - 1551
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    A microwave field can be used to accelerate electrons as they lose energy to radiation in an FEL, thereby maintaining synchronism and, used in conjunction with an optical klystron, providing high conversion efficiencies. The microwaves can be programmed to increase in time with the optical power level in the FEL so that high gain is maintained over a wide range of power levels. In this paper, parameter constraints for such an FEL are discussed, leading to a structure design that integrates a wiggler with a linac. It is shown that conversion ettlciencies of 50 percent at \lambda = 10 \mu m with a 2 m wiggler length can be achieved for typical FEL parameter values without sacrificing small-signal gain. View full abstract»

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

    Publication Year: 1987 , Page(s): 1452 - 1457
    Cited by:  Papers (1)
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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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  • Multiple bistability and multistability in a fabry-perot laser diode amplifier

    Publication Year: 1987 , Page(s): 1429 - 1433
    Cited by:  Papers (8)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1544 KB)  

    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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  • Simple long-pulse XeCl laser with narrow-line output

    Publication Year: 1987 , Page(s): 1458 - 1460
    Cited by:  Papers (2)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1024 KB)  

    Long-pulsed operation of a capacitive transfer driven XeCl laser using inductors has been demonstrated with no degradation of the laser performance. Spectral narrowing to a 0.003 Å bandwidth with an output energy of 4 mJ was also achieved using a grating and etalon combination. View full abstract»

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

    Publication Year: 1987 , Page(s): 1590 - 1593
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1096 KB)  

    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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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