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Quantum Electronics, IEEE Journal of

Issue 12 • Date December 1969

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Displaying Results 1 - 21 of 21
  • [Front cover and table of contents]

    Page(s): 0
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    Freely Available from IEEE
  • Announcement of a special issue

    Page(s): 557
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    Freely Available from IEEE
  • Analysis of the cylindrical confocal laser resonator having a single circular coupling aperture

    Page(s): 569 - 575
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    The diffraction losses of the cylindrical confocal resonator having a circular coupling aperture in the center of one of the resonator mirrors have been calculated over the range of resonator Fresnel numbers0 leq N_{b} leq 1.6by the numerical iteration technique of Fox and Li. The specific paths by which energy is diffracted from the resonator have also been investigated and a class of equivalent resonators found that maximizes the energy diffracted through the aperture for a given value of total diffraction loss. View full abstract»

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  • 1.5-GHz bandwidth light modulator

    Page(s): 618 - 620
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    A simple light modulator employing an interdigital microwave circuit and a short electrooptic crystal is described. Greater than 30 percent amplitude modulation, obtained by modulating the crystal birefringence, has been obtained between 0.8 and 2.3 GHz using 5 watts of RF drive power. View full abstract»

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  • Wavelength variations of a flashlamp-pumped sodium fluorescein dye laser

    Page(s): 621 - 622
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    The wavelength of a flashlamp-pumped sodium fluorescein dye laser is found to sweep toward decreasing values during each pulse but shifts gradually toward increasing values for successive pulses. Overlap of singlet-state fluorescence and absorption bands, along with chemical changes in the dye, can account for the observed effects. View full abstract»

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  • [Back cover]

    Page(s): 0
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    Freely Available from IEEE
  • Effects of combined RF and optical fields on a laser medium

    Page(s): 607 - 616
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    Modulation of a laser signal at radio frequencies ranging from 28 to 347 MHz is experimentally investigated by subjecting coherently emitting atoms of a Xe-He laser amplifier to simultaneous dc and RF magnetic fields. The sidebands are generated by a coherent nonlinear process that exhibits resonances when the Zeeman splitting of the laser levels equals the frequency of the magnetic field. A perturbational theory that is based on a simplified(j = 1 right arrow j = 0)atomic model adequately describes the dependence of the modulation efficiency on the dc magnetic field, the signal frequency, and atomic parameters. A presently unexplained phenomenon is the absence of the upper sideband. View full abstract»

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  • Resonance line shape and filling factor in an alkali vapor maser: Influence of atomic motion

    Page(s): 595 - 600
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    Resonance line shape and filling factor are two important parameters that condition the gain, oscillation threshold, output power, and short-term frequency stability of optically pumped alkali vapor masers. Both quantities are calculated using density matrix formalism and taking atomic motion into account. Some experimental verifications and methods for measuring the filling factor in a given configuration are indicated. View full abstract»

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  • The relation between large-signal gain and population difference for transitions with mixed broadening

    Page(s): 616 - 617
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    A relation between the incremental-gain constant and population difference of a medium with mixed broadening, which is valid for large-intensity signals, is derived. View full abstract»

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  • Proposed far-infrared difference-frequency generation using the Lorentz nonlinearity of a solid-state plasma

    Page(s): 586 - 589
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    A calculation is made of the efficiency of laser difference-frequency power generation in the far infrared by reflection from the surface of metals and semiconductors. It is assumed that the essential nonlinearity is that associated with the Lorentz force on conduction electrons for whichP^{NLS} = alpha(E_{L} times H_{L}). It is shown that, when two 1-kW separately tuned CO2lasers are used as primary sources, as much as 10-4watts in the100-1000 murange may be generated under favorable conditions. No phase matching of primary and difference-frequency waves is required. View full abstract»

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  • Properties of an unstable confocal resonator CO2laser system

    Page(s): 575 - 586
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    The results of an experimental and theoretical study of the properties of a confocal unstable resonator used with a conventional CO2-N2-He laser operating at 10.6 μ are presented. Measurements were made of the near- and far-field intensity distribution of the aligned resonator for Fresnel numbers of 3.7, 6.1, and 7.1. Fundamental mode operation was achieved in all cases. Beam steering and mode degradation associated with mirror misalignment were also studied experimentally. Suitable geometric models have been developed to account for 1) the sensitivity of the resonator output coupling and center far-field intensity to variations in the resonator length and mirror curvatures, and 2) the sensitivity of the beam direction and power to angular misalignment of the mirrors. View full abstract»

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  • Q-switched unidirectional ring lasers

    Page(s): 617 - 618
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    Traveling-wave operation of a ruby laser has been obtained by the use of a 5° Faraday rotator. Mode selection in a TW ruby laser with electroopticalQswitching is discussed. View full abstract»

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  • Organic lasers excited by a pulsed N2laser

    Page(s): 625
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    Laser action was obtained from rhodamine 6G and sodium fluorescein solutions by transverse pumping with a pulsed nitrogen laser. Relatively high efficiencies were observed and the threshold powers required were low. A repetition rate of ∼70 Hz was achieved with modest pump powers. View full abstract»

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  • Scattering and beam trapping in laser-produced plasmas in gases

    Page(s): 591 - 595
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    Experimental evidence is presented to verify that the laser light scattered at 90° from laser-induced breakdown plasmas in air is not due to Thomson scattering from free electrons as has been generally assumed. The scattering appears to be dominated by reflections from the interfaces of minute localized regions of high electron density. The geometry of the scattering regions indicates that self-focusing may occur in the plasmas generated in some gases. View full abstract»

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  • High-power single-frequency argon ion laser

    Page(s): 589 - 591
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    Single-frequency oscillation has been obtained from an Ar laser of increased power level with the help of a three-mirror Smith reflector (power in the 4880-Å line was 2 watts). Equations and plots that permit the choice of optimum parameters of the three-mirror reflector are given. It is shown that for effective frequency selection in a high-power laser of great length it is necessary to use beam splitter reflectivities exceeding 0.5. Single-frequency lasers of this type may be used in holography. View full abstract»

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  • Optical second-harmonic generation by electrically polarized isotropic media

    Page(s): 562 - 568
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    In relation to recent experiments, a quantitative discussion of the microscopic mechanisms accounting for second-harmonic generation (SHG) and harmonic mixing in isotropic media immersed in a dc electric field is given, comprising the temperature-independent effect of nonlinear electronic polarizability and the temperature-dependent effect of reorientation of permanent electric dipoles. It is shown that in the case of a very strong dc electric field, when all the microsystems undergo complete alignment in the direction of the field vector, these two mechanisms attain saturation, raising considerably the intensity of SHG in the case of prolate microsystems and lowering it in the case of oblate ones. Electric saturation effects can take place in strongly dipolar molecular substances but are especially intense in solutions of macromolecules and colloid particles. The discussion covers, moreover, the symmetry relations between the nonzero elements of the nonlinear susceptibility tensor of the medium in weak as well as in strong electric fields, and the application of these relations in determining the values of elements of the tensors of second- and third-order polarizabilities of the individual microsystems. A preliminary interpretation of the available experimental data is proposed, and new procedures of SHG measurements are suggested. View full abstract»

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  • Half-octave bandwidth traveling-wave X-band optical phase modulator

    Page(s): 622 - 623
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    Multiple interactions of optical and microwave fields in an electrooptical crystal have yielded low-power optical phase modulation over a 4.6-GHz bandwidth. View full abstract»

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  • Far-infrared laser gain resulting from rotational perturbations

    Page(s): 558 - 562
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    A simplified model is used to calculate the unsaturated gains of far-infrared rotational and vibrational-rotational laser transitions that are caused by rotational perturbations. Inversions are derived from the perturbation of an initial Boltzmann distribution of rotational populations, permitting the calculation of laser gains in terms of the perturbation parameters and the vibrational populations. The gain equations are applied to the three perturbations of H2O16that result in the largest number of laser lines. Numerical gain values in good qualitative agreement with experimental results are obtained. View full abstract»

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  • Parametric amplification and oscillation using an inverted maser material

    Page(s): 623 - 624
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    Experimental results are reported demonstrating the possibility of achieving parametric gain in an inverted paramagnetic medium. In this case the parametric pump frequency may be lower than the signal frequency. The authors used chromium-doped rutile as the active material, a pump frequency of 150 MHz, and a signal frequency of 4.25 GHz. The parametric effect is strongly supported by adjusting the idling circuit for high master gain. View full abstract»

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  • Thermal defocusing of CO2laser radiation in gases

    Page(s): 600 - 607
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    The steady-state thermal defocusing of CO2laser radiation (10.6-μ wavelength) in gases has been investigated experimentally and theoretically. The increase in the beam diameter and change in intensity caused by the self-induced index of refraction variations in absorbing gases has been studied as a function of laser beam power, the absorption coefficient of the gas, and the absorption pathlength. A Mach-Zehnder interferometer was used to examine directly the changes in the index of refraction of the absorbing gas, which cause the thermal defocusing. The experimental results compare favorably with a perturbation solution of thermal defocusing, taking into account the effects of thermal conduction and natural convection. View full abstract»

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  • Enhancement of laser action in H2O by the addition of helium

    Page(s): 620 - 621
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    The power output of a water vapor laser operating in the region from 28 to 119 μ has been increased at least five times by the addition of helium. The optimum mixture was 1.2-torr H2O and 4.6-torr He. 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