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Quantum Electronics, IEEE Journal of

Issue 10 • Date October 1973

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Displaying Results 1 - 17 of 17
  • [Front cover and table of contents]

    Page(s): 0
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    Freely Available from IEEE
  • An experimental study of the diagnostic potential of laser selective excitation spectroscopy for a potassium plasma

    Page(s): 972 - 978
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    A thermally tunedQ-switched ruby laser of moderate power, with emission wavelength at 6939 Å, has been used to selectively excite the4^{2}P_{3/2}-6^{2}S_{1/2}transition in the atoms of a pure potassium plasma of low degree of ionization produced in a hot cathode diode. A pulse of intensified spontaneous emission has been observed at 6939 Å, 6911 Å, and at a number of other wavelengths. The possibility of using this type of interaction for localized plasma diagnostics has been studied experimentally. It has been found that the intensified signal decay time decreases with increasing electron density, thereby providing a potential means for measurement of this parameter. In particular, it is shown that because of a saturation effect, the recorded signal characteristics depend to some extent on the laser parameters. A specially tailored laser performance is suggested as essential in order to overcome these problems and obtain signals which depend unambiguously on the plasma conditions. View full abstract»

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  • A glass-disk-laser amplifier

    Page(s): 992 - 999
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    The details of the analysis, design, and operation of a Nd-glass-disk-laser amplifier which has been constructed at the Naval Research Laboratory are presented. Gain and fluorescence measurements have been compared to theoretical predictions; these show that 0.6-J/cm3energy storage is achieved in the disk (assuming a cross section of3.0 times 10^{-20}cm2). The effects of unsuppressed parasitic oscillations are demonstrated and an effective method of preventing their occurrence is shown. The disk amplifier has demonstrated 320-J output in a 1-ns pulse with 110-J input. View full abstract»

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  • Xenon molecular laser in the vacuum ultraviolet

    Page(s): 1031 - 1032
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    Vacuum ultraviolet emission from high-pressure Xe gas under excitation by a pulsed electron beam has been investigated. When cavity mirrors were provided, significant line narrowing and a thousandfold increase in spectral intensity occurred at 1730 ± 10 Å. This was accompanied by severe mirror burning and provides strong evidence that an associative molecular Xe laser has been achieved. View full abstract»

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  • [Back cover]

    Page(s): 0
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    Freely Available from IEEE
  • The performance of photon-drag detectors at high laser intensities

    Page(s): 1007 - 1011
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    The response of germanium photon-drag detectors at high CO2-laser intensities is found to be nonlinear. Depending on the conditions, both superlinearity and saturation can be observed. It is known that the absorption of germanium at 10.6 μm decreases at high intensities, while the resistivity increases. It is shown that the nonlinear behavior of drag detectors can be satisfactorily accounted for by taking account of these two effects. In consequence, it is shown that it is possible to design germanium photon-drag detectors, without sacrifice of sensitivity, which are linear within a few percent up to power densities of about 40 MW.cm-2. View full abstract»

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  • Graded-index planar dielectric waveguides

    Page(s): 1023 - 1028
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    Properties of planar dielectric waveguides having a diffusion-induced index of refraction distribution are investigated. It is found that the spatial distribution of modes, group velocity, and mode spectrum of these guides differed qualitatively from the corresponding properties found in a slab waveguide. These results were experimentally verified by measuring the mode spectrum of a dielectric waveguide having an assumed complimentary error-function distribution of refractive index. View full abstract»

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  • TE modes of graded-index slab waveguides

    Page(s): 1000 - 1006
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    An analysis of the TE modes of a slab waveguide with graded refractive-index distribution is presented. The refractive index is approximated by a piecewise-linear distribution for which exact solutions of the guided-wave problem can be obtained. For multimode guides, useful approximate solutions can be worked out with the help of the Wentzel-Kramers-Brillouin (WKB) approximation. A formula is given for the total number of guided TE modes supported by the waveguide. The coupling efficiency of a prism coupler is investigated by studying the radiation losses of the guided modes escaping from the waveguide through the coupling prism. It is found that the radiation losses of the modes of the graded-index waveguide are more nearly constant than those of the asymmetric slab waveguide. View full abstract»

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  • Oversaturation of high-gain CO2lasers

    Page(s): 1030 - 1031
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    Sophisticated numerical calculations have been made of the optical power densities available in electric CO2lasers. For high values of the vibrational temperature of the ν3mode (> 1000 K), they give values 25 percent lower than those obtained by the classical gain-saturation formula. This oversaturation effect may also exist in other types of lasers. View full abstract»

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  • Spectral hole-burning and nonlinear-gain decrease in a band-to-level transition semiconductor laser

    Page(s): 1011 - 1019
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    Frequency characteristics of a nonlinear lasing gain under the condition that a laser oscillation exists at a fixed frequency are theoretically obtained on the basis of a band-to-level transition model (without thek- selection rule) of semiconductor lasers. This nonlinear gain exhibits a spectral hole-burning in the vicinity of oscillation frequency as well as a decrease from the corresponding linear gain over the entire spectral region. The analysis uses a semiclassical density-matrix formalism and a perturbation method. The lasing transitions are assumed to occur between a conduction-band Bloch state and a localized acceptor level. The above-defined nonlinear gain is obtained from a third-order perturbation calculation. In the neighborhood of a lasing frequency, a narrow spectral region where the gain is burned is theoretically found (hole-burning effect). The width of this "hole" increases with the relaxation rate at acceptor states, and is almost independent of excitation level. The gain decrease over the entire spectral region results from the absence of thek-selection rule, and corresponds to the saturation of spontaneous emission after the onset of lasing. Rapid relaxations in the conduction band and lower acceptor concentrations make more significant gain decreases at a frequency sufficiently apart from the lasing frequency. This effect makes possible a single axial-mode operation in some cases. View full abstract»

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  • Focusing-type optical modulator

    Page(s): 984 - 986
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    An optical modulator having a bandwidth of 1.6 GHz and a required power of 1 W for 100-percent intensity modulation at the wavelength of 0.63 μm has been constructed. The wide-band and low-drive power performance is obtained by the use of a structure-like beam waveguide. View full abstract»

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  • Transmission of a kodak 9740 dye solution under picosecond pulses

    Page(s): 979 - 984
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    The transmission of Kodak 9740 dye solutions as a function of picosecond pulse energy has been measured. The experimental results have been compared to theoretical ones. The validity of these results is borne out by the variation of the round-trip transit gain in the train of pulses emitted by a Nd3+glass laser mode locked by a Kodak 9740 dye solution. On the basis of this last result, it appears that the dye is not yet saturated at the beginning of the train of pulses. View full abstract»

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  • On the effect of cesium in photoionization laser plasmas

    Page(s): 1020 - 1023
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    A number of photoionization mechanisms and how they can be used to generate large-volume laser plasmas are discussed. Reaction rates for two-step photoionization of the cesium atoms as well as formation of molecular ions (Cs2+) are estimated. The necessary cross-section data were obtained from related research in thermionic energy converters. View full abstract»

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  • Near-infrared2Δ-2Π nitric oxide laser with predissociated lower state

    Page(s): 1029 - 1030
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    The spectrum of the light emitted at 10 200 Å by an NO laser is photographed with high resolution. The rotational analysis fully confirms the assignment made earlier to the transitionF^{2}Delta-C^{2}Pi(1, 1) between two electronically excited levels of the NO molecule, both of which are configurationally mixed with valence levels. View full abstract»

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  • High-radiance light-emitting diodes

    Page(s): 987 - 991
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    The properties of AlxGa1-xAs heterojunction incoherent edge emitters are described. Single (SH) and double-heterojunction (DH) diodes emitting at about 8200 Å were studied. The highest CW radiance measured perpendicular to the emitting facet was 95 W/cm2.sr at 4200 A/cm2for a stripe-geometry SH device. This high radiance level was found to be consistent with an operating life of many thousands of hours. The near- and far-field patterns of the diodes are presented as well as the spectral characteristics and the radiance as a function of drive current, both pulsed and dc. View full abstract»

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  • Measurement of fourth-order aberration in a lens-like medium

    Page(s): 967 - 971
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    Deformation of the spot of an off-axis Gaussian beam after passing through a lens-like glass fiber (SELFOC®) with the fourth-order aberration is investigated by using first-order perturbation theory and numerical calculation. A method for determining the coefficient of the fourth-order aberration is proposed. By this method, it is found that a SELFOC sample (0.5 mm in diameter and 150 mm in length) has a coefficienthof about 1.1, if the dielectric constant in the meridional plane of the sample is expressed asepsilon(x) = epsilon(0) (1 - g^{2}x^{2} + hg^{4}x^{4}), wherexis the distance from the axis of the medium andgis a positive constant. 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