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Quantum Electronics, IEEE Journal of

Issue 12 • Date December 1971

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Displaying Results 1 - 13 of 13
  • [Front cover and table of contents]

    Page(s): 0
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    Freely Available from IEEE
  • A comparison of the information-gathering capacities of photon-correlation devices

    Page(s): 541 - 550
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    This paper will begin with a survey of the general problem of correlation spectroscopy. It will present a novel approach to the derivation of the N -time generating functions and will use these generating functions to compute the expected signals in four kinds of photon-correlation devices and the noise associated with these signals. The four devices treated are 1) the full digital correlator, 2) the gated digital correlator, 3) the multichannel analyzer, 4) the pulse-separation analyzer. We compare the information-gathering abilities of the four systems by showing how the quantity (1/T) (\Gamma /\sigma _{\Gamma })^{2} varies as a function of the number of channels used, the number of observed correlation times, the average count rate, and the gating levels. Here \Gamma is the half-width of a Lorentz line, \sigma _{\Gamma } is the uncertainty in \Gamma as computed from a least-squares fit to the data, and T is the length of the experiment. View full abstract»

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  • [Back cover]

    Page(s): 0
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    Freely Available from IEEE
  • Influences of self-induced thermal effects on phase matching in nonlinear optical crystals

    Page(s): 560 - 563
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    In nonlinear optical crystals useful for second-harmonic generation, index inhomogeneities introduced by the self-induced temperature profile due to the laser beam influence the phase-matching conditions for nonlinear optical interaction. We have found that broadening of the width of the central peak, increase of asymmetry, shift of the maximum towards higher temperature, disappearance of the subsidiary structure in the second-harmonic power versus temperature, and the reduction of the conversion efficiency for second-harmonic generation may be caused. These effects depend upon the total absorbed power in the crystal, the birefringence variations due to temperature, the thermal conductivity, and the wavelength. View full abstract»

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  • Quantitative level population mechanism in gas discharges for pulsed argon-ion lasers

    Page(s): 555 - 560
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    The time-resolved intensities of hundreds of spontaneous-emission lines relating to four 4p laser levels belonging to a doublet and the time dependences of electron temperature and density were measured under 10-μs pulse excitation at high currents. The pumping and decay rates were calculated only for the 4p doublet as a function of time. The influence of radiation trapping on the 4s doublet is discussed. It is shown that the ratio of the cascade pumping rate to the total pumping rate of the 4p doublet increases during the last half of a 10-μs pulse. Moreover, the relative important of the cascade transitions in the formation processes of the 4p^{2}P_{3/2} laser level increases some what with time. View full abstract»

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  • Formation of self-trapped filaments by self focusing

    Page(s): 578 - 579
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    It is shown that under suitable conditions the self-focusing of a Gaussian beam can lead to the self-trapped solution of Chiao et al. [2]. The properties of the focused region are described in detail. View full abstract»

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  • Reduced modulator drive-power requirements for 10.6-µ guided waves

    Page(s): 580 - 581
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    It is shown that a reduction of more than an order of magnitude in electrooptic modulator drive power requirements should be possible at 10.6 μ by the use of a dielectric slab waveguide, despite the dimensional limitations imposed by electrode absorption. View full abstract»

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  • Performance of an unstable oscillator on a 30-kW CW gas dynamic laser

    Page(s): 581 - 583
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    Mode-control experiments at a 30-kW CW power level with an unstable resonator at a high Fresnel number were performed on a gas dynamic laser. Near- and far-field intensity distributions were obtained that are consistent with theoretical values for an approximately twice diffraction-limited beam. Under these conditions, the output power was more than half of the maximum multi-mode power. View full abstract»

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  • Linear and nonlinear optical properties of AgGaS2, CuGaS2, and CuInS2, and theory of the wedge technique for the measurement of nonlinear coefficients

    Page(s): 563 - 573
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    The refractive indices of the ternary A^{I}B^{III}C_{2}^{VI} semiconductors AgGaS2, CuGaS2, and CuInS2have been measured over the entire range of transparency of these crystals. The optical nonlinear coefficients for second-harmonic generation have also been determined. Three-frequency collinear phase matching is analyzed in detail for AgGaS2. The birefringences of CuGaS2and CuInS2are not large enough to permit three-frequency phase matching within the transparent regions. A parametric oscillator threshold calculation for a pump wavelength 0.89 μ, which is within the range of the GaAs injection laser, indicates that AgGaS2is promising for this application. The upconversion efficiency in AgGaS2for sum mixing of the CO2laser ( \lambda = 10.5 \mu ) with the xenon ion laser ( \lambda = 0.597 \mu ) is also calculated. The result indicates that, depending upon system requirements and the availability of high optical quality material, AgGaS2can be comparable to ZnGeP2for upconversion. In Appendix II, we present a theory of the wedge technique for the measurement of nonlinear coefficients. This theory takes into account losses and assumes a Gaussian beam geometry. Furthermore, a discussion of units in nonlinear optics is given. View full abstract»

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  • Frequency modulation of a self-mode-locked dual-polarization CO2laser

    Page(s): 577 - 578
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    Simultaneous active stabilization and frequency modulation of a mode-locked dual-polarization CO2laser is reported. Mode locking was maintained during frequency modulation through use of a self-regenerative feedback technique. View full abstract»

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  • Pulsed N2O molecular laser studies

    Page(s): 551 - 555
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    The afterglow pulse-gain technique was used to measure the relaxation of the 00°1 upper laser level in N2O from 300 to 700°K. The rate constant k_{N_{2}O} (torr-1s-1) varies with temperature as \log 10 k_{N_{2}O} = 4.53 - 10.9T^{-1/3} . Measurements of the relaxation time at 300°K agree with the fluorescence technique results of Yardley [1]. Gain studies were also made with gas mixtures in a nonflowing system. Single-pulsed N2O + CO + He mixtures at 300°K showed considerable peak gain. However, subsequent pulses of these mixtures show that the gain is reduced because of the chemical reaction forming CO2. Measurements of this transformation from one molecular laser mixture to another are discussed. View full abstract»

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  • Relative frequency stability of stable He-Ne gas laser structures

    Page(s): 573 - 575
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    Enhanced He-Ne gas laser stability has been achieved by constructing the mirror and gas discharge tube as an integral unit. The primary components are made from Corning ULE and 99JJW ultralow thermal expansion materials; ultrahigh-vacuum-type materials are used throughout. The ambient pressure sensitivity of these 6328-Å laser structures is 2.5 MHz/torr. Preliminary beat frequency measurements between two lasers, under pressure and temperature-controlled conditions, have yielded a beat frequency spectral width of the order of 2 kHz over an interval of 1 s. This result was achieved without the use of any elaborate sound or vibration isolation. Improved isolation reduced the spectral width to 100 Hz for a measurement duration of 0.02 s. The single-structure mirror-discharge tube has provided relative output power stabilities of better than 3 parts in 1000 over a period of 12 h. The frequency-modulation sensitivity is 1.2 kHz/μA of discharge current, from dc to 100 kHz. View full abstract»

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  • Threshold for spontaneous mode locking in Q-switched lasers

    Page(s): 575 - 576
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    An expression for the threshold output power density for spontaneous mode locking in Q -switched lasers is derived. The resulting expression is readily evaluated in terms of laser emission cross section and linewidth and cavity geometry. The expression is evaluated for several experiments which previously reported spontaneous mode locking. 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