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Quantum Electronics, IEEE Journal of

Issue 7 • Date July 1969

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

    Page(s): 0
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    Freely Available from IEEE
  • A nonlinear image contrast amplifier

    Page(s): 382 - 383
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (296 KB)  

    Thermal picosecond light scattering involving the amplification of weak beams interfering with a strong beam in absorbing liquid media provides a mechanism for amplifying the contrast of weak optical images. View full abstract»

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  • A quasi-continuous dye laser

    Page(s): 386
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    A quasi-continuous organic dye laser pumped with the second harmonic of a repetitivelyQ-switched ruby laser is reported. View full abstract»

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  • [Back cover]

    Page(s): 0
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    Freely Available from IEEE
  • Many-pass resonant laser amplifier

    Page(s): 385 - 386
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB)  

    A very high gain amplifier has been developed by arranging for many amplifying passes to be made through one system. Input pulses of millijoule energy have been amplified to the damage limit of the materials (∼10 J/cm2) by this method. One such system can replace several when amplification of low-energy pulses is required. View full abstract»

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  • Switching of phase-locked states in the intracavity phase-modulated He-Ne laser

    Page(s): 367 - 376
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    It is known that there exist two solutions for the He-Ne laser phase locked by synchronous internal phase modulation. One corresponds to a phase difference between adjacent modes of even integers of π (even state) and the other to odd integers of π (odd state). Although their frequency power spectra in general look similar, they appear in the time response as two different sets of pulse trains 180° out of phase with respect to each other. Of the two, for a given set of conditions, it has not yet been possible to predict which state will oscillate. In our observations we find that, if the modulation frequency is fixed slightly higher than the average axial-mode spacing near the line center, the two states can be controlled by varying the amplitude of the modulation signal, resulting in a switching action between the two states. Furthermore, we find that in a narrow region of "detuning" and in a small range of modulation amplitudes, both states oscillate simultaneously. The above results were analyzed by considering the asymmetry in the frequency characteristics of the gain medium due to the presence of the isotope Ne22in the He-Ne mixture. Based on this fact and the concept of "supermode" competition, we give a physical explanation for the observed behaviors. This is supported by the absence of amplitude-dependent switching in a He-Ne tube containing only pure isotope Ne20. We observe also in a He-Ne tube containing 75% Ne20and 25% Ne22the dominance of one state over the other; this result is consistent with the qualitative theory given. View full abstract»

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  • Comments on the self-focusing of short light pulses

    Page(s): 381 - 382
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    A simple analysis of the self-focusing of a short pulse shows that the distance at which the focal region first appears exceeds the minimum focusing distance Zfby an amount dependent upon the initial pulsewidth. This focal region subsequently expands as it moves down the medium, the limiting width being the width of the portion of the pulse above the critical power. View full abstract»

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  • Nonlinear optics with finite geometry

    Page(s): 383 - 384
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    Coupled amplitude equations are derived to describe the interaction of three light waves propagating in a nonlinear dielectric waveguide. The coupling coefficients reflect the combined effect of the nonlinear susceptibility and the finite geometry. View full abstract»

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  • The CW gain characteristics of several gas mixtures at 337 µ

    Page(s): 377 - 380
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    An experimental investigation of the CW gain characteristics at 337 μ of several HCN laser systems was carried out. The gain is reported as a function of pressure, current, gas mixture, and flow rate. In addition, the radial distribution was determined and the gain was found to be independent of radius for all mixtures measured. 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