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Quantum Electronics, IEEE Journal of

Issue 4 • Date April 1972

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Displaying Results 1 - 10 of 10
  • [Front cover and table of contents]

    Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (328 KB)  
    Freely Available from IEEE
  • [Back cover]

    Page(s): 0
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    Freely Available from IEEE
  • Supersonic transverse electrical discharge laser

    Page(s): 414 - 418
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1640 KB)  

    An electrically excited CO2-N2laser has been developed using high repetition rate discharge pulses from a pin electrode array transverse to a supersonic flow. To date volumetric laser power density of 34 W/cm3from a Mach 3 flow at 17-kHz repetition rate and 160-torr static pressure has been achieved. Power densities of at least 150 W/cm3at atmospheric pressure appear possible. The supersonic blowdown facility and electrical pulse generator are described and experimental results are discussed. View full abstract»

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  • Linear and nonlinear optical properties of ternary AIIBIVC2Vchalcopyrite semiconductors

    Page(s): 419 - 426
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    The refractive indices of ZnSiAs2, CdGeP2, and CdGeAs2have been determined over a wide range of wavelengths and the optical nonlinear coefficient for second-harmonic generation from the 10.6-μ CO2laser have been measured. The absorption coefficient versus wavelength is given for the above materials as well as for ZnGeP2, a previously discussed material. Three-frequency phase-matched mixing is described for each material. View full abstract»

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  • Experiment on cross relaxation in CO2

    Page(s): 404 - 414
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    The details of the hole-burning process are studied experimentally and theoretically in a Doppler-broadened gain or absorption line in pure CO2and in CO2-N2mixtures contained in a test cell. The change of absorption or gain of the test cell when irradiated by a saturating laser in aPtransition is probed with another laser operating in one of manyRtransitions. In this way one may determine the rate of velocity cross relaxation within a single rotational-vibrational level and the rate of cross relaxation between different rotational levels of the upper and lower vibrational states. When the probing laser shares a common upper or lower level with the saturating laser, a pip is observed in the differential absorption or gain profile at total pressures of less than 0.5 torr. At higher pressures the relaxation across the velocity profile eliminates the pip. An analysis is presented of the population distribution in the multilevel system of CO2. Three of the relaxation rates (describing the relaxation across the velocity profile of a single level, the relaxation among rotational levels of the vibrational state, and the phenomenological relaxation rate of entry into and departure from the upper and lower vibrational states) are determined. The last of the three rates is found to be dominated by diffusion at the pressures used in the experiment. View full abstract»

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  • Generation of infrared radiation by Raman scattering and difference frequency mixing with a Nd:YAG pump

    Page(s): 427 - 428
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    A repetitivelyQ-switched Nd:YAG laser was used to produce "eye-safe" radiation near 1.55 μm by stimulated Raman scattering in acetonitrile and in methane with photon conversion efficiencies of 14 percent and 22 percent, respectively. The laser and Stokes beams were mixed in lithium niobate to obtain 6-kW peak power pulses at the difference frequency near 3.4 μm with a photon conversion efficiency of 1.1 percent. View full abstract»

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  • Single-transverse-mode mode-locked ruby laser

    Page(s): 428 - 429
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    A mode-locked ruby laser has been built, utilizing a new kind of prism ring cavity that gives reliable single-transverse-mode operation. The cavity also operates in single-transverse mode whenQswitched and when operated in normal lasing action. View full abstract»

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  • Laser-stimulated atomic migration

    Page(s): 393 - 400
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    The effects of stimulated Raman scattering (SRS) and of infrared (IR) absorption on the scattering at defects leading to atomic migration in solids is evaluated in detail for certain systems.DeltaE/kT approx sum u_{ic}^{2}/langleu_{i}u_{i}rangle, whereDeltaEis the activation energy, uicis the many-body critical displacement in a migration event, andlangleu_{i}u_{i}rangleis the equal-time correlation function including anharmonic terms. Using the equal-time correlation for the defect lattice in the harmonic approximation, we getDeltaE/kT_{eff} propto 1/sum h[2(n_{s} + n_{e}) + 1]where Teffincludes both neand nsthe externally and thermally excited phonon numbers, respectively. The phonon rate density required for an observable effect of SRS or IR absorption on diffusion in solids isn_{e}^{(c)}c_{s}/V approx 10^{26} - 10^{27}phonons/s.cm2, wheren_{e}^{(c)}is a critical number of high wave-vector laser-stimulated phonons, cs, is the sound velocity, and V, the volume per atom. In KCI at 110 K, theory shows thatn_{e} = 0.2can produce a factor of 10 effect on the reorientation of Na:FAcenters. Anharmonic effects onlangleu_{i}u_{i}ranglewere calculated and numerical estimates indicate that they would be experimentally observable for large ne. It is found that some of the effects reported here probably contribute, in part, to the permanent damage tracks caused by high-power laser beams in solids and provide an internal source for the initiation of microcracks. In addition, the direction of the stimulated phonon wave vector is shown to produce a directional effect in the control of atomic migration. View full abstract»

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  • Optical pulsewidth measurement using self-phase modulation

    Page(s): 429 - 430
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    Simple expressions are given that relate the duration of a self-phase modulated ultrashort optical laser pulse to the number of minima (or maxima) and the maximum Stokes (or anti-Stokes) frequency shift of its spectrum. View full abstract»

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  • Radial gain profiles in CO2laser discharges

    Page(s): 400 - 404
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    Measurements of the gain of the P(20), 10.6 μ, transition of CO2have been made in a flowing He, N2, CO2amplifier. Both small-signal and saturated gain conditions were investigated as a function of radial position. At low discharge currents, the radial small-signal gain profile followed a J0Bessel function distribution as predicted from the electron density distribution, while at higher currents, the gain was nearly constant across the tube diameter. Further increases in the current produced a lower gain on the tube axis than near the tube wall. This spatial behavior of the small-signal gain with discharge current can be understood following the theoretical models of Gordietz et al. or more recently of Wiegand et al. The theory indicates the small-signal gain behavior is largely explained by the increase of axial gas temperature with discharge current. Gain measurements at signal levels high enough to cause gain saturation indicate the gain is harder to saturate on the tube axis than near the tube wall. An analysis of the experimental data shows that the gain-saturation parameter increases with current density. 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..

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Meet Our Editors

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