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Quantum Electronics, IEEE Journal of

Issue 2 • Date February 1970

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Displaying Results 1 - 14 of 14
  • [Front cover and table of contents]

    Page(s): 0
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    Freely Available from IEEE
  • Analysis of frequency modulation of junction lasers by ultrasonic waves

    Page(s): 129 - 132
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    An analysis of the interaction of ultrasonic waves with the junction-laser modes is performed, using first-order perturbation theory. It demonstrates that in the presence of sound waves, each laser mode is frequency-modulated with negligible harmonic distortion or mode mixing. It is also shown that bandwidths of several GHz, with high-modulation index are possible. View full abstract»

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  • Characteristics of stimulated emission from CdS by electron-beam pumping

    Page(s): 133 - 137
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    The results of electron-beam experiments on undoped single-crystal CdS are presented. A description of the beam-injection apparatus is given. The relevance of various indications for lasing in this type of structure is discussed, and an operational definition of lasing threshold current is described. In this paper intensity versus pumping carves, stimulated-emission moding curves, and measurements of the frequency- and time-dependent characteristics of the stimulated emission from undoped CdS will be presented and discussed. New data show that there is a 1.1 Å/ns shift of the stimulated peak emission to longer wavelengths which is independent of the pumping current density. This effect is not understood but is crucial to the understanding of the CdS electron-beam-pumped semiconductor laser. View full abstract»

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  • [Back cover]

    Page(s): 0
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    Freely Available from IEEE
  • Use of plasma tube impedance variations to frequency stabilize a CO2laser

    Page(s): 139 - 140
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (288 KB)  

    A method for stabilizing the frequency of a single-J- value CO2laser to the center of its output power versus frequency curve based upon the variation of the impedance of the plasma tube with the optical power extracted is described. Frequency modulation of the laser produces an ac component of voltage drop across the plasma tube, which is synchronously detected to generate a frequency-error signal. View full abstract»

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  • Coupling of power from a circular confocal laser with an output aperture

    Page(s): 93 - 96
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    An iteration technique is used for a theoretical study of the field distributions and diffraction losses at the reflectors of an asymmetric confocal cylindrical resonator having an output hole in one mirror for the low-loss TEM00and TEM10modes with Fresnel numbers ofN = 0.8and 1.2. A digital computer is used to numerically iterate an initially launched uniform distribution as it reflects back and forth between the mirrors until a steady-state field distribution occurs. The edge and coupling hole diffraction losses and the power coupled from an output hole in one mirror are also computed. The presence of the coupling hole produces a perturbation of the field distribution with distortion of the field increasing for increasing Fresnel number and for low-order modes. The relationship between hole radius and power output is presented. An optimum-size coupling hole may be selected from this data, which will yield maximum power output in the mode of operation desired. It has been found that, with the use of a coupling hole, mode selection of the lowest order TEM00mode is possible for resonators having large Fresnel numbers (N > 1.0). View full abstract»

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  • Axial magnetic field effects on a saturated He-Ne laser amplifier

    Page(s): 117 - 122
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    The behavior of a He-Ne laser amplifier in the presence of an axial magnetic field has been studied experimentally by measuring Faraday rotation and gain for various values of input signal intensity. Two high-gain transitions in the 3.39-μ region were used for study-aJ = 1toJ = 2transition and aJ = 1toJ = 1transition. Theoretical expressions have been developed, which included the nonlinear effects of saturation strength signals. Experimental results clearly show saturation of Faraday rotation; in addition, for theJ = 1toJ = 1transition, a Faraday rotation reversal and a traveling-wave magnetic field dip are seen. These results match the theoretical predictions and provide a method for measuring the upper (3s2) level quadrupole moment decay rate. View full abstract»

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  • Stabilized efficient single-frequency Nd:YAG laser

    Page(s): 101 - 104
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    It is shown how intracavity etalons can be optimally designed for axial mode selection and frequency stabilization of gas and crystal lasers. Relevant laser parameters, required etalon properties, and expected losses are determined. A simple frequency stabilization scheme based on birefringent etalons is described, which does not require laser modulation. Major problems associated with stable single-frequency operation of solid-state lasers are discussed. Using an optimally designed crystal quartz etalon, a Nd:YAG laser could be stabilized to 10-7in frequency and 2 percent in amplitude. The linearly polarized single frequency TEM00output was 150 mW, which compares to an unpolarized 12-mode output of 400 mW for the bare laser. View full abstract»

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  • Dynamic optical properties of CW Nd:YAlG lasers

    Page(s): 97 - 100
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    The thermal and optical properties of CW Nd:YAlG laser rods have been measured before and during optical pumping with tungsten lamps. Instabilities in the optical properties during pumping were found to correlate reasonably well with the fluid flow characteristics of the coolant used. The importance of stable optical properties to the attainment of maximum laser radiance and amplitude stability is emphasized. Estimates of the mean temperature rise and profile in the rod during pumping are given. View full abstract»

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  • Far-infrared laser action using compound grating Fabry-Perot resonators

    Page(s): 138 - 139
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    A water vapor laser has been operated with a subsidiary grating Fabry-Perot resonator replacing one end mirror. Double-wavelength operation was obtained. Single-wavelength operation was obtained with strong rejection of shorter wavelength radiation, a variable effective reflectivity of the end mirror, and control of polarization characteristics of the cavity, allowing linear or circular polarization. View full abstract»

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  • Far-infrared laser emission in gas discharges containing boron trihalides

    Page(s): 113 - 116
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    Laser emission has been observed at 54 wavelengths between 11 and 41 μ in pulsed electrical discharges in BF3, BCl3, and BBr3. The emission wavelengths have been measured and the time behavior of the lines studied. Lasing in each of the gases produces total peak powers on the order of 10 to 100 mW. The addition of N2, He, or H2O to the discharge is found to have considerable effect on the peak powers of various lines and on the total energy emitted. The observed wavelengths are consistent with pure rotational transitions in HF, HCl, and HBr. Some short wavelength lines in the1.5-6 muregion are also observed but do not appear to be associated directly with the far-infrared emissions. View full abstract»

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  • Some effects of group-velocity dispersion on parametric interactions

    Page(s): 123 - 129
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    Three-wave parametric interactions are studied in media exhibiting group-velocity dispersion. Under certain conditions these interactions may be described by the same equations that govern pulse propagation in a two-level resonant system. This analogy suggests the existence of steady-state pulse solutions in the three-wave parametric system. Such solutions are found, and are analogues of pi and two-pi pulses. The variety of solutions in the parametric system is greater than in the resonant case. View full abstract»

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  • CO2transverse-discharge lasers

    Page(s): 105 - 113
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    A parametric study has been undertaken to determine the gain characteristics of flowing CO2-N2-He lasers employing a transverse-discharge configuration. Unlike conventional cylindrical discharge tubes, in this device the gas-flow and electrical-discharge paths lie perpendicular to the optical axis. Box lasers with various aspect ratios and electrode configurations were evaluated. The gain exhibited an inverse dependence upon the height of the box laser. The axial gain in the Faraday dark space is lower than in the region of the positive column, decreasing monotonically to zero at the cathode. The character of the axial gain profile is significantly changed by a reversal in the direction of gas flow relative to the polarity of the discharge. For a volumetric gas flow of 0.3 scfm, a peak gain of 3.4 dB/m was attained with a box laser characterized by 1/2-inch height, an 8:1 aspect ratio, and a 1-inch adjacent electrode spacing. Power output data are presented for a box laser employing a folded optical resonator. 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