By Topic

Quantum Electronics, IEEE Journal of

Issue 6 • Date June 1982

Filter Results

Displaying Results 1 - 20 of 20
  • [Front cover and table of contents]

    Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (203 KB)  
    Freely Available from IEEE
  • Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optical bistability

    Page(s): 1042 - 1043
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (218 KB)  

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Lasers and chemical change

    Page(s): 1043
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (95 KB)  

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Back cover]

    Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (916 KB)  
    Freely Available from IEEE
  • Efficiency studies of the thallium anti-Stokes Raman laser

    Page(s): 941 - 943
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB)  

    Selective photodissociation of TlCl and TlI using 248 nm radiation from a KrF* excimer laser has been used to create a Tl* (6p^{2}Pdeg_{3/2}) metastable state population inversion. Stimulated anti-Stokes Raman emission at 376 nm has been observed using a 532 nm pump laser. Output power at the anti-Stokes wavelength and conversion efficiencies are reported. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Interband Auger recombination in InGaAsP

    Page(s): 938 - 941
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (368 KB)  

    The interband Auger recombination lifetimes of two Auger processes have been calculated to correlate measured threshold current densities and carrier lifetimes for InGaAsP and InGaAsSb lasers. Good aggreement with experimental data was obtained for lasers with low nominal threshold current densities. These results demonstrate the importance of Auger recombination in the threshold characteristics of InGaAsP/InP lasers. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Injection locking properties of a semiconductor laser

    Page(s): 976 - 983
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (976 KB)  

    Injection locking properties of a semiconductor laser have been analyzed, taking into account the injected carrier density dependent refractive index in the active region. It has been found that this dependence significantly affects the injection locking properties, giving rise to a peculiar asymmetric tuning curve and dynamic instability. The instability originates from the intermode interaction via the modulation in the injected carrier density caused by intensity beat. The detuning dependence of the direct modulation response characteristics inside and outside of the locking range have also been examined. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Luminescence decay and injected carrier lifetime in the high injection region of AlGaAs lasers

    Page(s): 971 - 976
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (656 KB)  

    Luminescence decays following short current pulse excitation of an antireflection coated AlGaAs laser diode have been measured. Using an optical gating technique, decays in the high injection region (simgthreshold density of uncoated lasers) were measured with a 100 ps time resolution. The observed luminescence decay is shown to be strongly affected by net gain in the active region. It is also shown that both monomolecular and bimolecular carrier recombination must be considered. A model has been developed that takes these effects into account and is shown to accurately describe steady-state and decay spontaneous emission intensities from laser diodes. A procedure is outlined for determining the necessary device and material parameters for interpreting laser diode characteristics. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Study of the XeCl laser pumped by a high-intensity electron beam

    Page(s): 1008 - 1020
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1464 KB)  

    We present the results of a detailed experimental study of the XeCl laser pumped by a high-intensity electron beam. The laser system was optimized as an oscillator for mixtures of Xe and HCl with Ne, Ar, and Kr diluents. The peak intrinsic efficiency (laser energy out/electron-beam energy deposited) was near 4.5 percent for each of these diluents. Small-signal gain and background absorption were measured as a function of electron-beam deposition rate from 0.4 to 6 MW/ cm3. The ratio of small-signal gain to absorption was found to be constant over this range with a value of ∼5. Measurements of absorption in the presence of a large photon flux indicated that there was no appreciable saturable contribution to the absorption. Measurements of fluorescence from theBandCstates indicate that collisional mixing between these states is very rapid. The formation efficiencies of theBandCstates are estimated to be 0.15 and 0.05, respectively. A vibrational relaxation rate of between 1 and1.5 times 10^{-10}cm3. s-1was determined. The effect of this finite relaxation rate is to reduce the energy available to the stimulated process by a factor of 0.67-0.75. Estimates of the XeCl* deactivation rates by HCl and electrons were also obtained. A value of1.7 times 10^{-9}cm3. s-1was obtained for quenching by HCl, and a value ofsim 1 times 10^{-7}cm3. s-1was estimated for electron deactivation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Calculation of separated multiclad-layer stripe geometry laser modes

    Page(s): 984 - 991
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (760 KB)  

    The waveguide modes have been calculated for the separated multiclad-layer stripe geometry laser recently described by Ishikawa et al. Our analysis includes coupling of the mode within the stripe to both guiding and antiguiding modes outside the stripe. Mode losses larger than previously estimated have been calculated, but they are within acceptable limits and are comparable to or smaller than losses in a similar CSP laser. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Coherence and intersymbol interference in digital fiber optic communication systems

    Page(s): 944 - 951
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (776 KB)  

    Because of the quadratic relation between optical power and optical field, the transmission of optical power through an optical fiber is, in principle, nonlinear. Under usual conditions, random fluctuations of the incoherent source field and mode mixing tend to linearize the system. Previous assessments of the effect of intersymbol interference (ISI) on the performance of digital fiber optical communication systems are based on the assumption of linearity. This paper examines the effect of ISI on error rates in the other limit of complete coherence where fields are additive but powers are not. It is found that in this nonlinear regime and for weak dispersion, ISI may reduce the error rates slightly, whereas strong dispersion augments it considerably. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optical AND gate

    Page(s): 992 - 995
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB)  

    We have successfully demonstrated a new type of logic circuit which provides an optical output pulse that is the AND function of two wavelength multiplexed optical input signals. The active components of this optically coupled logic gate are a triggerable semiconductor laser and a novel photodetector consisting of two series photodiodes which are sensitive in different wavelength bands. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electrooptic gigahertz light-pipe modulator for CO2laser wavelength

    Page(s): 1021 - 1029
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1312 KB)  

    We have built a traveling-wave electrooptic modulator for 10.6 μm where the optical beam propagates in a highly oversized waveguide. Three CdTe-crystals measuring35 times 0.8 times 0.8mm3each are cascaded to yield an aspect ratio of 131. Velocity matching between optical and modulating waves and a line impedance of 100 Ω are achieved by proper choice of dielectric embedding and of electrode width. Measured characteristics are: optical transmission 96 percent, maximum input VSWR 1.25:1, half-wave voltage 450 V, and frequency response ±1.1 dB over a 0.006-1 GHz range. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Externally heated copper vapor laser for parametric studies

    Page(s): 996 - 998
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (368 KB)  

    The construction and operation of a reliable externally heated copper vapor laser for parametric studies is presented. A long-life high-temperature heating element is described. A temperature measurement method has been developed that is compatible with laser operation and has an accuracy ofpm20degC over the range0-1700degC. The laser is operated in the burst mode to eliminate effects of discharge hearing and enable measurement of the time evolution of laser behavior. An electrical circuit was developed which eliminates transient electrical behavior at the beginning of the burst. An example of parameter measurement, the dependence of output power on tube temperature under specific operating conditions, is also given. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Observation and assignment of large offset farinfrared laser lines in CH3OH optically pumped by a CO2waveguide laser

    Page(s): 1004 - 1008
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (600 KB)  

    Four new FIR laser lines at 62.98, 48.77, 224.53, and 190.65 μm are reported from CH3OH, optically pumped by the 10R34 and 9R10 lines of a waveguide CO2laser. Measurements performed by several techniques confirm that the pump offsets are outside the tuning range of conventional CO2lasers. Two of the lines are assigned as highJtransitions within the torsional ground state of the CO stretch. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Oscillation center frequency tuning, quantum FM noise, and direct frequency characteristics in external grating loaded semiconductor lasers

    Page(s): 961 - 970
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1200 KB)  

    Simple analytical expressions for the oscillation frequency, quantum FM noise spectrum, oscillation power spectrum, spectral linewidth, and direct optical frequency modulation efficiency in semiconductor lasers with external grating feedback are presented. Experimental results for the grating loaded AlGaAs lasers are in good agreement with the theoretical predictions. Remarkable reduction in spectral linewidth to less than 50 kHz is achieved by feeding back only 10-3of the output power. Oscillation frequency stabilization, frequency jump behavior, and reduction in direct optical frequency modulation efficiency are also discussed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optical frequency conversion in quasi-phase-matched stacks of nonlinear crystals

    Page(s): 1029 - 1041
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1488 KB)  

    We present a quantitative theory of nonlinear frequency conversion in stacks of crystals where the phase mismatch due to dispersion is compensated by changing the sign of the nonlinear coupling coefficient in successive crystals-a method first proposed by Armstrong et al. We include pump depletion in our calculations of the second harmonic generation and sum and difference frequency generation. We start with ideal stacks in which the crystal lengths are tailored to achieve perfect phase compensation. When the conversion in each coherence length is small, all crystal lengths tend to equal the coherence lengthpi/Deltak. Frequency conversion in such stacks is well approximated by that in an equivalent phase-matched crystal with the nonlinear coupling coefficient reduced by a factor of2/pi. The effect of systematic as well as random departures in crystal lengths are studied with special attention to the evolution of the relative phase. We show that with appropriate choice of the signs of the nonlinear coupling coefficient in various crystals, high efficiency frequency conversion should be possible using practically any sufficiently large set of nonlinear crystals. The theory of second harmonic generation in periodic stacks and in rotationally twinned crystals of zinc-blend structure is described in detail. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Mode characteristics of nonplanar double-heterojunction and large-optical-cavity laser structures

    Page(s): 952 - 961
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1128 KB)  

    Mode behavior of nonplanar double-heterojunction (DH) and large-optical-cavity (LOC) lasers is investigated using the effective index method to model the lateral field distribution. The thickness variations of various layers for the devices discussed are correlated with the growth characteristics of liquid-phase epitaxy over, topographical features (channels, mesas) etched into the substrate. The effective dielectric profiles of constricted double-heterojunction (CDH)-LOC lasers show a strong influence on transverse mode operation: the fundamental transverse mode (i.e., in the plane perpendicular to the junction) may be laterally index-guided, while the first (high)-order mode is laterally index-antiguided. The analytical model developed uses a smoothly varying hyperbolic cosine distribution to characterize lateral index variations. The waveguide model is applied to several lasers to illustrate conditions necessary to convert leaky modes to trapped ones via the active-region gain distribution. Theoretical radiation patterns are calculated using model parameters, and matched to an experimental far-field pattern. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Radial laser-induced sound wave propagation and vibrational relaxation in carbon dioxide

    Page(s): 999 - 1003
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (504 KB)  

    The effective vibrational relaxation time of CO2excited to the 00°1 level has been measured by the phase fluctuation Optical heterodyne technique. An apparent pressure dependence of the relaxation time can be attributed to the finite velocity of sound. This effect can be corrected to yield a value ofptau = 7.6 mus . atm. The effect of laser-initiated cylindrical sound waves on the data is examined in some detail. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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