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Quantum Electronics, IEEE Journal of

Issue 8 • Date August 1976

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Displaying Results 1 - 14 of 14
  • [Front cover and table of contents]

    Page(s): 0
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    Freely Available from IEEE
  • The self-heated 442-nm He-Cd laser: Optimizing the power output, and the origin of beam noise

    Page(s): 482 - 493
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    Power output and beam noise parametric results are obtained for the blue transition of the self-heated He-Cd laser in tubes of 0.10-0.16-cm bore diameter. Presentation of this data in the form of performance contour maps shows that the usual scaling laws for laser discharges are accurate for this laser (<12-percent parameter variation for a 60-percent diameter variation) and is a convenient form for use in tube design. The contour maps imply the existence of a direct connection between the output and noise of this laser. A theory is proposed that the noise in the He-Cd discharge arises from the rapid increase in ionization rate due to Penning collisions as Cd is added to the He discharge. This produces a high gain in the discharge column for the growth of striation waves (which modulate the output). The theory correctly predicts the details of the laser noise behavior, showing that both the noise and output share a common origin in the Penning effect. The dependence of Cd vapor density on tube current is found, from sidelight studies, to be more pronounced in self-heated tubes (as opposed to tubes with externally heated Cd sources). A threshold dissipation value is given for puncture of the hot glass bore by the discharge (this is a common failure mode in the He-Cd laser). View full abstract»

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  • Analysis of grating-coupled radiation in GaAs:GaAlAs lasers and waveguides - II: Blazing effects

    Page(s): 494 - 499
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    Grating-coupled radiation in lasers and waveguides is analyzed for trapezoidal-shaped grating teeth which includes all triangular shapes. A perturbation technique is used which involves calculating the modes in a geometry with an inhomogeneous refractive index profile in the grating region. Curves are presented for radiated power from traveling waves as a function of blazing angle, grating tooth height, refractive index, and grating period. It is shown that the ratio of power radiated into the outer media depends greatly on tooth shape and size. By judiciously selecting parameters this ratio can exceed 50:1. View full abstract»

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  • A Gd2(MoO4)3longitudinal electrooptic modulator at 6328 &#197;

    Page(s): 507 - 510
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    A Gd2(MoO4)3light modulator operating at low frequencies, from 100 Hz up to 1 MHz, is examined. Experimental results concerning the thermal behavior and stability, frequency response, and linearity performance characteristics of the system are presented. Advantages and disadvantages of the modulator are discussed. View full abstract»

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  • [Back cover]

    Page(s): 0
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    Freely Available from IEEE
  • Thermal effects in jet-stream dye lasers

    Page(s): 513 - 515
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    The effect of temperature gradients from absorption of the pump energy in jet-stream dye lasers is investigated photographically. The pictures show definite crescent-shaped patterns (representing serious astigmatism) for the lower jet-stream velocities, and some interferences even at the highest velocities. The sources of heating are discussed and the results coordinated with theoretical predictions. View full abstract»

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  • Nonlinear refractive index coefficient for Nd phosphate laser glasses

    Page(s): 512 - 513
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    Intensity-dependent changes in the refractive index of three low-index Nd phosphate laser glasses (LHG-5, LHG-6, EV-1) and one Nd fluorophosphate laser glass were measured at 1064 nm using time-resolved interferometry. The nonlinear refractive index coefficients of these phosphate glasses are all smaller than for Nd silicate laser glass (ED-2). View full abstract»

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  • Coaxial sweep scheme for ion-beam lasers

    Page(s): 515 - 517
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    A coaxial sweep scheme for use in ion-beam lasers is proposed. Space charge and emittance effects which normally tend to defocus ion beams are effectively controlled. View full abstract»

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  • Field configurations and propagation constants of modes in hollow rectangular dielectric waveguides

    Page(s): 505 - 507
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    The field configurations and propagation constants of linearly polarized low-loss modes in hollow dielectric waveguides with rectangular cross section are computed analytically under the assumption that the dimensions of the rectangular cross section are much larger than the free-space wavelength. The attenuation constant is then equal to the sum of the corresponding TE- and TM-mode attenuation constants in parallel-plate waveguides. View full abstract»

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  • Coherent effects in spin-flip light scattering

    Page(s): 500 - 504
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    A pulsed, coherent, spin-flip Raman experiment is proposed. Calculations show that if narrow pulses are used to drive the spin system in InSb via the Raman coupling, the equivalent of an NMRpi/2-pulse experiment may be achieved. The free induction decay signal is expected to be about 10-6J/pulse and might serve as an intense, pulsed, magnetically tunable source of far-infrared (IR) generation. View full abstract»

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  • Photoionization parameters in the carbon dioxide laser gases

    Page(s): 470 - 482
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    The data and results of an extended investigation of the more salient parameters associated with the application of ultraviolet (UV) photoionization processes in TEA CO2lasers are presented. The study encompasses emission spectra, wavelength dependence, and influence of circuit parameters for a typical UV spark source. This investigation and a companion study utilizing a specialized charge collection apparatus on a monochromator provides further insight into the primary mechanisms involved in these photoinitiated laser devices and has, in addition, provided design criteria for the development of more efficient photoionization sources. View full abstract»

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  • The prism coupler and the dielectric bend: Similarities and anomalous behavior

    Page(s): 463 - 469
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    Properties of the output prism coupler and the dielectric bends are investigated near cutoff. A decrease in the attenuation very close to cutoff is exhibited by the prism coupler and might be possible also in the bend case. Range of validity of the established approximated solutions is discussed. View full abstract»

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  • Picosecond relaxation time measurement from the Q-switched threshold

    Page(s): 510 - 512
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    A method is presented for measurement of the relaxation time of a passiveQ-switch dye in the picosecond region which is based on the determination of theQ-switch threshold. The relaxation times of 24 ± 5 ps for cryptocyanine and 28 ± 5 ps for modified dicarbocyanine iodide were obtained. View full abstract»

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  • Rotational nonequilibrium and line-selected operation in CW DF chemical lasers

    Page(s): 453 - 462
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    A numerical analysis of rotational nonequilibrium effects in CW DF chemical lasers is presented. The rotational master equations incorporate the effects of simultaneous mixing, chemical pumping, rotational cross relaxation, and radiative emission. Rotational cross relaxation is described by "exponential gap" models in which ΔJ is unrestricted. Results of this analysis indicate that rotational equilibrium can be a poor assumption for high J levels even under small-signal conditions. The model predictions are in good qualitative agreement with observed multiline resonator spectra. Performance loss due to rotational nonequilibrium is predicted to be modest (∼15 percent) for multiline operation, with larger losses predicted for line-selected modes. Criteria for efficient line-selected operation are presented. 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