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Quantum Electronics, IEEE Journal of

Issue 7 • Date July 1979

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Displaying Results 1 - 25 of 28
  • [Front cover and table of contents]

    Publication Year: 1979 , Page(s): 0
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    Freely Available from IEEE
  • A double-ended, unstable resonator submillimeter laser

    Publication Year: 1979 , Page(s): 538 - 540
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (352 KB)  

    The characteristics of a pulsed, methyl fluoride laser utilizing a novel, double-ended unstable resonator are described. The design incorporates an intracavity, double-faced scraper mirror to produce separate input/output ports for CO2pump laser excitation and submillimeter laser output. Experimental results show that this configuration achieves state-of-the-art conversion efficiency and diffraction-limited beam quality. View full abstract»

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  • A xenon ion pumped open dye stream laser

    Publication Year: 1979 , Page(s): 541 - 542
    Cited by:  Papers (2)
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    A pulsed xenon ion laser with an output power of 1 kW over the blue-green lines was used to pump an open dye stream laser. An efficiency of the order of 40 percent was determined in broad-band mode operation. The bandwidth in this case was 48 nm (from 582 to 630 nm). View full abstract»

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  • Characteristics of a CW water vapor laser at 118 and 28 µm

    Publication Year: 1979 , Page(s): 614 - 616
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    The characteristics of a CW water vapor laser operating at 118 and 28 μm are reported. By monitoring the discharge current, helium gas pressure, and water vapor pressure, a criterion for optimum power output has been obtained. Peak powers of 6 and 114 mW are obtained, respectively, for the 118 and 28 μm lines for a 4.5 m discharge tube. View full abstract»

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  • Further comments on "Dielectric-waveguide-modal properties: A new analysis of the one-dimensional wave equation"

    Publication Year: 1979 , Page(s): 664
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    First Page of the Article
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  • Comments on "Dielectric-waveguide-modal properties: A new analysis of the one-dimensional wave equation"

    Publication Year: 1979 , Page(s): 664
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (121 KB)  

    First Page of the Article
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  • [Back cover]

    Publication Year: 1979 , Page(s): 0
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    Freely Available from IEEE
  • The dependence of Raman gain on pump laser bandwidth

    Publication Year: 1979 , Page(s): 648 - 655
    Cited by:  Papers (18)
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    The dependence of Raman gain upon laser bandwidth is analyzed in terms of a set of coupled mode equations. The analysis predicts that the Raman gain is independent of pump laser bandwidth within limitations set by dispersion in the Raman medium. These results are verified for rotational and vibrational transitions in H2using a variable bandwidth Nd:YAG laser. View full abstract»

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  • Experimental investigation of the atomic fluorine laser

    Publication Year: 1979 , Page(s): 609 - 613
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB)  

    The atomic fluorine laser, as produced by a fast pulsed discharge in He-NF3mixtures, is investigated experimentally. Total collisional quenching rates of He 23S on NF3, BF3, CBrF3, CCIF3, CHF3, CF4, C2F6, CO2, SF6, and N2are reported. Upper limits for collisional quenching rates of He 21S, 23P, and 21P atoms on NF3are determined. We conclude that energy transfer from excited neutral He to NF3is not the primary pumping mechanism in the He-NF3atomic fluorine laser. View full abstract»

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  • Spectra of the lowest excited singlet states of rhodamine 6G and rhodamine B

    Publication Year: 1979 , Page(s): 624 - 632
    Cited by:  Papers (5)
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    Excited states of laser dyes were generated in solution by an intense 6 ns laser pump pulse tuned to the absorption maximum of the longest wavelength, ground state absorption band. They were interrogated by a shorter, simultaneous, monochromatic pulse of smaller diameter, concentric and collinear with the pump, having a crossed polarization. Plots of transmission curves against intensity for the pump beams approached residual absorptions at the highest intensities. Gain or attenuation of the probe was measured throughout the region of the long wavelength absorption bands, at the 578.2 nm copper vapor laser wavelength, and for rhodamine 6G across the lasing band. Gains were determined at different probe intensities, and were extrapolated to small-signal values. The dyes have fluorescences at the ground state absorption maxima, hence pumping at these wavelengths cannot achieve 100 percent S1population. Auxiliary saturation transmissions were determined beyond the fluorescence bands and the first experiments were corrected to give a measure of \sigma _{e} - \sigma ^{\ast } , the difference between the stimulated emission cross section and the excited state absorption cross section. Assumptions in the experiment and improvements in experimental technique are discussed. View full abstract»

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  • Mode conversion and optical filtering of obliquely incident waves in corrugated waveguide filters

    Publication Year: 1979 , Page(s): 632 - 637
    Cited by:  Papers (24)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (536 KB)  

    By employing a coupled-mode analysis, we reveal the presence of strong coupling between TE and TM modes in a periodically corrugated optical-waveguide when the wave propagates obliquely with respect to grating vector. The evidence of such mode coupling has been obtained by the polarized transmission and reflection experiment; then the measured strengths of coupling among various modes are successfully compared with calculated values. The effect of such coupling on the performance of a frequency demultiplexer is discussed with some preliminary experiments. View full abstract»

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  • Injection laser characteristics due to reflected optical power

    Publication Year: 1979 , Page(s): 559 - 565
    Cited by:  Papers (38)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (928 KB)  

    Fluctuations in injection laser output intensity and spectrum caused by light reflected from an optical system are investigated theoretically and experimentally. The theoretical analysis is accomplished by applying the semiclassical theory to an injection laser, and introducing an optical feedback term. It is shown that light reflected from a near-field region causes power deviation and an oscillating wavelength shift. It is also shown that reflected light from a far-field region changes laser light spectrum and introduces frequency noise components in laser output power. View full abstract»

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  • Theoretical and experimental study of threshold characteristics in InGaAsP/InP DH lasers

    Publication Year: 1979 , Page(s): 571 - 579
    Cited by:  Papers (20)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (768 KB)  

    Threshold characteristics of stripe-geometry InGaAsP/InP double-heterostructure injection lasers have been analytically derived as a function of active layer thickness and stripe width. The effects of stripe width, refractive index in the active layer, diffusion of injected carriers, carrier lifetime, absorption loss in the cladding layer, gain coefficient, and cavity length on the optimum thickness of the active layer which gives minimum threshold or on threshold current density were studied. These lasers were fabricated on View full abstract»

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  • Transmission characteristics of long spliced graded-index optical fibers at 1.27µm

    Publication Year: 1979 , Page(s): 638 - 642
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (608 KB)  

    Transmission characteristics of graded-index fibers at 1.27 μm are investigated. Bandwidth measurements are made in the frequency domain by using a CW GaInAsP laser diode modulated by a sinusoidal signal. For a germanium pbosphosilicate fiber, the optimum index profile at 1.27 μm is determined as 1.98. It is shown that optimum profile at 0.83 μm is 2.08 and there exists a large profile dispersion effect: for example, the experimental maximum 3-dB bandwidth at 1.27 μm decreases to one-third at 0.83 μm. Length dependence of bandwidth is investigated for 48 km long spliced graded-index fibers at 1.27 μm. It is verified that using a simplified transmission model in which mode conversion is assumed at splicing points, the bandwidths of long spliced fibers are predicted with satisfactory accuracy in terms of unit fiber transfer functions. View full abstract»

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  • III-V alloy heterostructure high speed avalanche photodiodes

    Publication Year: 1979 , Page(s): 549 - 558
    Cited by:  Papers (23)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1392 KB)  

    Heterostructure avalanche photodiodes have been successfully fabricated in several III-V alloy systems: GaAlAs/GaAs, GaAlSb/GaSb, GaAlAsSb/GaAlSb, and InGaAsP/InP. These diodes cover optical wavelengths from 0.4 \to 1.8 \mu m. Early stages of development show very encouraging results. High speed response of <35 ps and high quantum efficiency >95 percent have been obtained. The dark currents and the excess avalanche noise will also be discussed. A direct comparison of GaAlSb, GaAlAsSb, and InGaAsP avalanche photodiodes is given. View full abstract»

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  • Operating characteristics of a high pressure DF-CO2CW chemical transfer laser

    Publication Year: 1979 , Page(s): 595 - 602
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    Interest in the DF-CO2transfer chemical laser (TCL) is stimulated by its potential to yield high specific efficiencies and high gain coefficients at high optical cavity pressures. Previous technology studies of the DF-CO2TCL for the most part have been limited to operation at cavity pressures of 100 torr or less. Recently, high pressure operation (233 torr) of a supersonic TCL has been achieved. Analytical predictions have indicated that a high velocity subsonic TCL could be operated at cavity pressures as high as 200 torr. Based upon these predictions, a small subsonic device has been designed and constructed specifically for operation at 200 torr. Parametric scanning gain and power extraction experiments have been conducted on this device at cavity pressures of 100, 140, and 200 torr. Parametric analytical studies at these cavity pressures have also been completed. The emphasis in the present work was placed on achieving flow conditions yielding the highest gain distributions. The device is found to produce 500 W of closed cavity power under optimum flow conditions. The performance of the device is well represented by the analysis with peak gains of 1.5 percent/cm being attained in typical experiments. View full abstract»

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  • Comprehensive kinetics model for DF-CO2transfer chemical lasers

    Publication Year: 1979 , Page(s): 602 - 608
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    A computer model of the DF-CO2CW transfer chemical laser (TCL) which treats the first nine vibrational states of DF and the first thirty-nine vibrational states of CO2is described in detail. Information theory, as it now exists, was used to correlate the large number of possible energy transfer processes involving the CO2molecule with the rather small body of published experimental data. The parameters required in the description of rate processes involving the DF molecule were obtained from the latest reviews of the subject. The model, with a scheduled mixing assumption, was used with good success to describe the operational characteristics of a variety of subsonic devices covering a pressure range of 20-200 torr. The computer model, as developed herein, is fairly complete and should be capable of describing a variety of laser options including operation at wavelengths other than at 10.6 μm, e.g., at 9.4, 12-14, and 16 μm, with only minor alterations required. View full abstract»

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  • Spectral narrowing of a flashlamp-pumped high-energy dye laser by two-stage injection locking

    Publication Year: 1979 , Page(s): 616 - 623
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (888 KB)  

    This paper proposes a new scheme of multistage injection locking controlled by a narrow-band CW dye laser to obtain spectral narrowing of a high-energy flashlamp-pumped dye laser (FLPL). The spectrum of FLPL with an output energy of 23 J was successfully narrowed to 0.7 GHz by this method. A narrow-band CW radiation was injected into the cavity of a small FLPL, then its locked output emission was injected into the cavity of the high-energy FLPL. With a CW injected power of 15 mW, about 70 percent of the output energy of the final laser was concentrated into the same spectral region as the injected CW radiation. The effective power gain obtained was as large as 4 \times 10^{8} . Using coupled rate equations based on a simplified model, the injection-locking phenomena were analyzed. This model makes it possible to derive the locking efficiency as a function of the injected power in an explicit form, and gives an insight for experiments. Some performances of injection-locked operation were studied experimentally. View full abstract»

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  • Longitudinal mode competition in a pulse modulated AlGaAs DH semiconductor laser

    Publication Year: 1979 , Page(s): 542 - 544
    Cited by:  Papers (2)
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    Mode competition in pulsed AlGaAs lasers, which oscillate in a few longitudinal modes, is studied by time resolved spectrum measurement. Only a single mode oscillates at a time; other modes are suppressed. Mode transition time is 30 ns which coincides with theoretical evaluation. View full abstract»

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  • Electronically tuned synchronously pumped dye laser

    Publication Year: 1979 , Page(s): 547 - 548
    Cited by:  Papers (2)
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    We have demonstrated electronically tunable pulses as short as 1.3 ps with a tuning rate of 150 Å/kV using a synchronously pumped rhodamine dye laser. Electronically tunable transform limited pulses of 5 ps duration have also been produced. View full abstract»

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  • Sensitivity analysis of optical waveguides

    Publication Year: 1979 , Page(s): 545 - 546
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    The change in the characteristics of dielectric slab and fiber waveguides due to dimensional tolerances of their parameters has been analyzed. The analysis is helpful in fabrication and use of such guides in optical communication systems. View full abstract»

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  • Calculated spontaneous emission factor for double-heterostructure injection lasers with gain-induced waveguiding

    Publication Year: 1979 , Page(s): 566 - 570
    Cited by:  Papers (126)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    The fraction of spontaneous emission going into an oscillating laser mode has been calculated. It is shown that this fraction strongly depends on the strength of astigmatism in the laser output beam. Therefore the spontaneous emission factor in planar stripe lasers with narrow stripe is in the order of 10-4and by one order of magnitude larger than in injection lasers with a comparable active layer volume and with a built-in index waveguide. It is shown that the spontaneous emission factor is approximately proportional to the solid angle of laser radiation and nearly independent of the transverse active layer dimensions. Owing to the large spontaneous emission factor, the spectral width of narrow planar stripe lasers is significantly broader compared to narrow stripe lasers with a built-in index waveguide. In addition the large spontaneous emission coefficient also yields a much stronger damping of relaxation oscillations. View full abstract»

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  • Thin-film tunable optical filtering using anisotropic and noncollinear acoustooptic interaction in LiNbO3waveguides

    Publication Year: 1979 , Page(s): 642 - 647
    Cited by:  Papers (2)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (608 KB)  

    Theoretical and experimental studies of optical filtering which utilize anisotropic and noncollinear acoustooptic interaction in a Y -cut LiNbO3waveguide are reported. A guided-light beam from either an He-Ne laser at 6328 Å or an argon laser at around 5000 Å, propagating at an angle centering around 70° from the Z(c) axis of the LiNbO3crystal, was Bragg diffracted by the surface acoustic wave with 500 MHz center frequency and propagating at 16° from the x axis of the crystal. High optical resolving power, large optical angular aperture, and good spatial separation between the filtered light and the unfiltered light have been simultaneously achieved. An optical passband of 16 Å and an angular aperture of 9° have been measured for the case in which the undiffracted and diffracted light propagate in TE0mode and TM0mode, respectively. Furthermore, by varying the acoustic frequency from 350 to 670 MHz, the filtered optical wavelength may be tuned from 8300 to 5000 Å. View full abstract»

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  • Interference of an AlGaAs laser diode using a 4.15 km single mode fiber cable

    Publication Year: 1979 , Page(s): 535 - 537
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    Polarization characteristics in cabled single mode fibers were studied. By using 4.15 km long fibers and a single frequency AlGaAs double-heterostructure laser, interference fringes were observed. View full abstract»

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  • New CW far-infrared laser lines from CO2laser-pumped CH3OD

    Publication Year: 1979 , Page(s): 537 - 538
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (216 KB)  

    Seven new CW far-infrared laser lines are reported for the CH3OD molecule optically pumped by a CO2laser. 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