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Quantum Electronics, IEEE Journal of

Issue 12 • Date December 1966

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Displaying Results 1 - 7 of 7
  • [Front cover and table of contents]

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  • A quantitative study of the stimulated Raman effect using an off-axis resonator

    Page(s): 763 - 769
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    The use of an off-axis resonator system to study the generation of first-Stokes radiation in benzene is considered both theoretically and experimentally. The primary advantage of the off-axis system concerns the fact that the resonator is driven by a temporal and spatial average of the exciting laser beam, thereby minimizing light trapping effects. With these trapping effects reduced in relative importance, quantitative measurements of the stimulated Raman effect in self-focusing materials are possible, and the experimental data agrees with the steady-state solution presented here to within the experimental accuracy. View full abstract»

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  • [Back cover]

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  • Excitation cross section of some of the states of NE II, Ar II, and KR II by electron collision

    Page(s): 770 - 773
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    The sudden perturbation method has been used to calculate the excitation cross section of some of the states of Ne II, Ar II, and Kr II by high energy electrons. In this method, the ground state of the noble gas atom, after a collision with a fast electron, is considered to lose one of its valence electrons in a time shorter than the relaxation time of the atom. The resulting configuration is then assumed to be a|(p^{5}) ^{2}P_{j}ranglestate withJ = 3/2or 1/2, with the remaining five valence electrons having the same radial coordinates as in the original|(p^{6})^{1}S_{0}ranglestate of the neutral atom. The configuration|(p^{5})^{2}P_{j}rangleis then expanded in terms of the ionic wave functions having the form of|(p^{4})bar{L}bar{S}, nl', LSJrangle, wherebar{L},bar{S}designate the total orbital angular momentum and the total spin angular momentum of the core electrons,l'is the orbital angular momentum of the excited running electron, andLSJdesignates the final orbital, spin, and total angular momenta of the atom. The coefficients of the expansion are calculated in terms of the coefficients of fractional parentage and3-jsymbols. The radial wave functions for the neutral atoms and their excited ionic states for the involved radial integrals are obtained by using a computer program giving the self-consistent Hartree-Fock wave functions in the Slater approximation. Since no experimental measurements for the excitation cross sections with fast electrons are given, the results of the calculations are indirectly compared with the available work reported on the pulsed Ar II laser. Population of various excited ionic states is calculated assuming a uniform energy distribution of electrons having 1.8 times the ionization threshold of argon, and the results are compared with experimental data reported in the literature. View full abstract»

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  • Effect of gain saturation on the oscillating modes of optical masers

    Page(s): 774 - 783
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    Because an active maser medium exhibits nonlinear gain saturation, the oscillating modes of an optical maser are expected to be somewhat different from those of the passive resonator. Statz and Tang [5] have obtained some numerical results for an active resonator with a pair of parallel-plane, infinite-strip mirrors. We have reformulated the problem for active resonators with circular mirrors of both parallel-plane and confocal geometries and have obtained numerical results using an iterative method of solution. We find the cardinal features of the active modes, such as mode patterns, diffraction losses, and resonant frequencies, to be essentially the same as those of the passive modes, even for unsaturated gains as high as three and a half dB per pass. The mode that predominates in an active Fabry-Perot resonator is found to be the lowest-order (TEM00) mode. However, the predominating modes in an active confocal resonator are found to depend on the Fresnel number; the larger the Fresnel number, the higher is the mode order. The study includes computations of field distributions, diffraction losses, and phase shifts of the steady-state predominating modes and of their output intensities as functions of unsaturated gain, saturation parameter, mirror transmissivity, scattering loss, and resonator geometry. 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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Editor-in-Chief
Aaron R. Hawkins
Brigham Young University