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IEEE Journal of Quantum Electronics

Issue 2  Part 1 • Date February 1972

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Displaying Results 1 - 25 of 51
  • [Front cover and table of contents]

    Publication Year: 1972, Page(s): 0
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    Freely Available from IEEE
  • A coupled-mode analysis of mode locking in homogeneously broadened lasers

    Publication Year: 1972, Page(s):29 - 33
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1380 KB)

    The coupled-mode equations are solved for homogeneously broadened lasers modulated near the axial mode separation frequency. The character of the oscillations changes rapidly when the modulation period is tuned through the round-trip delay at the group velocity. Specifically, this is the region in which phase modulation leads to pulsing and loss modulation leads to pulsing at normal power. The pre... View full abstract»

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  • An investigation of gases for Stark modulating the CO2laser

    Publication Year: 1972, Page(s):34 - 38
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1415 KB)

    A number of gases are reported that extend the range of CO2laser lines able to be modulated by means of the molecular Stark effect. Data are presented on external modulation of the ... View full abstract»

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  • A simplified model for predicting gain, saturation, and pulse length for gas dynamic lasers

    Publication Year: 1972, Page(s):46 - 53
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2572 KB)

    A single time-scale model is developed to describe the 10.6-μ laser energy extraction from an initially inverted N2-CO2catalyst mixture where the energy is stored primarily in the N2vibration. This condition is typical of high-pressure gas dynamic lasers, but the methods are general and applicable to other systems. In the absence of external pumping, the nitro... View full abstract»

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  • The time behavior and spectra of relaxation oscillations in a high-gain laser

    Publication Year: 1972, Page(s):69 - 73
    Cited by:  Papers (46)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1642 KB)

    It is found that under appropriate conditions the high-gain 3.51-μ xenon laser may exhibit relaxation oscillations in the frequency range of 1 to 10 MHz. Experimental investigations have been conducted in both the time and frequency domains. Most of the observed features of these fluctuations are in good agreement with theoretical considerations. View full abstract»

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  • Preface

    Publication Year: 1972, Page(s): 97
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    Freely Available from IEEE
  • Laser generation of conductor patterns

    Publication Year: 1972, Page(s):126 - 131
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1940 KB)

    A laser pattern generation system has been developed to define gold conductor patterns on ceramic substrates. Such patterns are used as interconnection circuitry for silicon integrated circuits. The system consists of a mechanical positioning device for the substrates, a numerical control system, and an Nd:YAG laser to evaporate the gold selectively to form the desired pattern. Rotational motion i... View full abstract»

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  • Characteristics of a CO laser

    Publication Year: 1972, Page(s):150 - 160
    Cited by:  Papers (68)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3144 KB)

    Some characteristics of CO laser operation are reported. A discussion of the roles of the various ingredients necessary for optimization of the gas compositions is given and measurements of efficiency, spectral output, small signal gains, and saturation intensity at various temperatures are reported. Important mechanisms that dominate the kinetics of the molecules and electrons in electrical disch... View full abstract»

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  • A survey of integrated optics

    Publication Year: 1972, Page(s):199 - 205
    Cited by:  Papers (38)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2222 KB)

    In order for optical transmission systems to compete successfully with other techniques, the circuits must be comparably small, comparably rugged, and comparably priced. The avenue to achieving these characteristics is via miniature guided-wave structures in contrast to beam-mode propagation via lenses and mirrors. Passive miniature transmission lines with satisfactory losses have been formed in g... View full abstract»

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  • Wave propagation in thin-film optical waveguides using gyrotropic and anisotropic materials as substrates

    Publication Year: 1972, Page(s):212 - 216
    Cited by:  Papers (19)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1604 KB)

    Wave propagation in optical waveguides on substrates of magnetic, optically active, or birefringent material is analyzed. The conditions for TE \Leftrightarrow TM mode conversion are derived and computer calculations showing the characteristic of a quartz-substrate mode converter is obtained. A mathematical analysis of a gyrator using two mode converters in s... View full abstract»

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  • Stimulated emission in multiply doped Ho3+:YLF and YAG - A comparison

    Publication Year: 1972, Page(s):225 - 230
    Cited by:  Papers (40)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1285 KB)

    A comparison of threshold and slope efficiency is made for 2-μm laser action in Ho3+-doped YLF and YAG hosts at room temperature. Spectroscopic and laser properties of these materials are also discussed. View full abstract»

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  • 2.1-µm laser of 20-W output power and 4-percent efficiency from Ho3+in sensitized YAG

    Publication Year: 1972, Page(s):231 - 234
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1334 KB)

    The most efficient lamp-pumped laser yet reported has been obtained from the 2.1-μm transition of Ho3+in Er3+-Tm3+sensitized YAG at liquid nitrogen temperatures. Multimode CW output of 20 W, efficiencies up to 4 percent, and 5-W TEM00at 1 percent resulted when tungsten-iodine pump lamps were utilized. View full abstract»

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  • Wide-band laser communications in space

    Publication Year: 1972, Page(s):263 - 272
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3617 KB)

    Candidate wide-bandwidth (1-Gbit/s) satellite laser communications systems are compared on two different bases. First, a comparison is made with projected component technology to establish relative performance between the various approaches based on the fundamental system parameters. From this comparison it appears that the CO2(10.6-μm) system offers a signal-to-noise advantage ove... View full abstract»

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  • [Back cover]

    Publication Year: 1972, Page(s): 0
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    Freely Available from IEEE
  • Deep penetration welding with high-power CO2lasers

    Publication Year: 1972, Page(s):132 - 135
    Cited by:  Papers (37)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1432 KB)

    Experiments performed over the past year have involved the use of near-diffraction-limited lasers at power levels up to 20 kW for welding applications. This is a substantially higher power level than used in all previously reported experiments. As a result of the higher powers, significantly deeper penetration has been achieved. The optical cavity for the lasers used in these tests was an unstable... View full abstract»

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  • Importance of self-focusing in a laser amplifier with large beam diameter

    Publication Year: 1972, Page(s):273 - 276
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1392 KB)

    The self-focusing of a beam with Gaussian intensity profile is examined for dependence on sample length, beam diameter, and beam divergence or convergence. The results indicate that amplifiers for Q -switched pulses can be designed to avoid significant self-focusing effects. View full abstract»

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  • Experiments with a pulsed CO2gas dynamic laser

    Publication Year: 1972, Page(s):161 - 163
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    We report operation of a pulsed combustion-heated gas dynamic CO2laser. The pulsed version is compared with the continuous gas dynamic laser. Variation of the pulse energy with the stagnation pressure of the gas, the shape of the expansion nozzle, and output mirror transmittance is discussed. Observed laser pulse energy of 110 J is compared with theoretical estimates of maximum obtainab... View full abstract»

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  • Effects of mode conversion in acoustooptical modulation

    Publication Year: 1972, Page(s):184 - 191
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2504 KB)

    The conversion of a Gaussian laser beam into higher order optical beam modes through acoustooptical modulation is treated. In particular the effects of this conversion in an optical communications system are described with emphasis placed on the actual signal received by a distant antenna rather than on the total power scattered. For the special case of pulse amplitude modulation, which is conside... View full abstract»

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  • On the stability of a steady-state π pulse

    Publication Year: 1972, Page(s):89 - 90
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    It is shown that in the absence of relaxation or inhomogeneous broadening the steady-state π pulse in an amplifier is locally unstable against the introduction of certain amplitude perturbations. View full abstract»

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  • High-sensitivity receiver for infrared laser communications

    Publication Year: 1972, Page(s):252 - 263
    Cited by:  Papers (22)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3792 KB)

    The design of a high-sensitivity wide-bandwidth 10.6-μm heterodyne receiver has been established for space and ground operational use, and key elements for a satellite-to-earth communications link were demonstrated. The receiver includes a cooled HgCdTe infrared mixer diode, a conical scanner for spatial tracking, an acquisition channel for spatial search and station alignment, and an automat... View full abstract»

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  • Fundamental mode radiation with solid-state lasers

    Publication Year: 1972, Page(s):239 - 245
    Cited by:  Papers (16)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2280 KB)

    Optical pumping of solid-state lasers induces thermal lensing in the laser crystal. This lansing determines the beam properties in the resonator; the TEM00-mode radiation is limited to a small laser rod volume and it depends on the pump power. Especially with pulse-pumped systems, the generation of stable fundamental mode radiation could only be obtained with low efficiency. Laser reson... View full abstract»

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  • The cross-beam electric-discharge convection laser

    Publication Year: 1972, Page(s):139 - 144
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2168 KB)

    An experimental investigation of a 60-cm-wide × 2.5-cm-high N2-CO2cross-beam electric-discharge convection laser (EDCL) is described. In the cross-beam EDCL, the discharge is maintained along the flow in a rectangular cross-section channel and optical power is extracted transverse to the discharge and flow. High mass flow rates are employed to achieve high volumetric pow... View full abstract»

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  • Gigahertz cutoff frequency capabilities of CdHgTe photovoltaic detectors at 10.6 µ

    Publication Year: 1972, Page(s):180 - 184
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1568 KB)

    Using departure from stoichiometry, p-n junctions were prepared in CdxHg1-xTe with x \simeq 0.20 for the study of photovoltaic detection at 10.6 μ. In the final photodiodes, with sensitive areas between 4 \times 10^{-4} and 10-3cm2, values such as ... View full abstract»

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  • Lasing and spectral line characteristics in phosphate glasses and inorganic liquids with neodymium

    Publication Year: 1972, Page(s):196 - 198
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    Possible reasons for narrow-band oscillation of phosphate glass and inorganic liquid lasers with neodymium are described. It is shown that experimental data considered earlier to be evidence of fast energy-transfer rate can alternatively be explained if the degree of spectral line inhomogeneity is about unity. Neodymium stimulated-emission cross sections in phosphate glasses are compared at room a... View full abstract»

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  • Mode configurations in second-order mode-locked lasers

    Publication Year: 1972, Page(s):74 - 79
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1960 KB)

    An analysis of the mode frequencies and phases of lasers that are self-pulsing due to second-order mode locking is presented. It is shown that locking can occur with the modes arranged in several different configurations with different pulsing frequencies corresponding to the beat notes between different combinations of longitudinal modes. The experimental observations of the transition between tw... 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