By Topic

Quantum Electronics, IEEE Journal of

Issue 7 • Date July 1987

Filter Results

Displaying Results 1 - 25 of 26
  • [Front cover and table of contents]

    Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (1409 KB)  
    Freely Available from IEEE
  • Announcing a joint special issue of the journal of lightwave technology and the IEEE journal of quantum electronics on integrated optics

    Page(s): 1102
    Save to Project icon | Request Permissions | PDF file iconPDF (257 KB)  
    Freely Available from IEEE
  • Editorial announcement

    Page(s): 1102
    Save to Project icon | Request Permissions | PDF file iconPDF (257 KB)  
    Freely Available from IEEE
  • Announcing a special issue of the IEEE journal of quantum electronics on nonlinear optical phase conjugation

    Page(s): 1103
    Save to Project icon | Request Permissions | PDF file iconPDF (264 KB)  
    Freely Available from IEEE
  • Announcing a special issue of the IEEE journal of quantum electronics on the quantum and nonlinear optics of single atoms, ions, and electrons

    Page(s): 1104
    Save to Project icon | Request Permissions | PDF file iconPDF (227 KB)  
    Freely Available from IEEE
  • Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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 (847 KB)  
    Freely Available from IEEE
  • Application of linear prediction least-squares fitting to time-resolved optical spectroscopy

    Page(s): 1116 - 1121
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2208 KB)  

    Linear prediction least-squares fitting is shown to be a powerful tool for the quantitative analysis of pump-probe-type experiments. When used correctly, it is capable of extracting multiple exponential or exponentially damped sinusoidal components from noisy data. Furthermore, it can be used to analyze data that are not simply the response of the system being studied, but rather the convolution of a nonnegligible instrument function with the desired response. In pump-probe experiments, it can be used to deduce time constants that are considerably shorter than the laser pulse itself. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Nonlinear self-guiding and switching in an all-fiber device

    Page(s): 1108 - 1112
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1240 KB)  

    We study the nonlinear propagation of light in optical fibers in the strong nonlinearity limit. In this limit, the transverse guiding properties are altered and cannot be decoupled from the longitudinal part of the wave equation. We consider a refractive index profile with no bound modes at low intensities and show that stable self-guiding occurs at a critical intensity. This critical intensity is a property of the guide and can be made much lower than the threshold for unstable self-focusing. We consider a particular design for which self-guiding occurs at three orders of magnitude lower than the self-focusing threshold. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Properties of four-layer planar optical waveguides near cutoff

    Page(s): 1172 - 1179
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2472 KB)  

    Mode properties of four-layer planar optical waveguides near cutoff are considered. The four-layer structures considered are applicable to waveguiding layers formed on cladding layers above either silicon or gallium arsenide substrates. Perturbation approaches are shown to be accurate except near mode cutoff where a numerical solution of the four-layer equations is required. Numerical calculations of waveguide attenuation due to substrate coupling for thermally nitrided silicon dioxide and for gallium aluminum arsenide waveguides are presented for a variety of layer thicknesses, layer material compositions, and wavelengths. Comparison to some experimental data is included. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Phase-mismatch dependence of efficiency of wave generation through four-wave mixing in a single-mode optical fiber

    Page(s): 1205 - 1210
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1752 KB)  

    The generation wave efficiency with respect to phase mismatch in the four-wave mixing process is clarified experimentally in a single-mode fiber transmission line at 825 nm wavelength. The generated power of approximately 20 pW is measured successfully for input signal powers below 1 mW by the technique utilizing a heterodyne receiver and lock-in detector. The calculated efficiency as a function of the equivalent frequency separation can well explain and reflect the results obtained experimentally. Furthermore, the efficiency at zero chromatic dispersion wavelengths of 1.3 and 1.55 μm is also discussed considering chromatic dispersion slope against wavelength. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The refractive index measurements of RF magnetron sputtered ZnO thin film on sapphire

    Page(s): 1105 - 1107
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (728 KB)  

    Measurements were made of the refractive index of an RF magnetron sputtered ZnO thin film on sapphire. We compare the experimental results to theory when TE and TM guided waves propagate in the plane at an arbitrary angle with respect to thecaxis when thecaxis lies in the plane of the film. Care also should be taken when one usesm-line spectroscopy to determine the refractive index of a film. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Impact ionization resonance and auger recombination in Hg1 - xCdxTe ( 0.6 \le x \le 0.7 )

    Page(s): 1145 - 1154
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2488 KB)  

    The purpose of this paper is the study of the impact ionization and the Auger recombination in Hg1-xCdxTe avalanche photodiodes, with0.6 leq x leq 0.7. Forx sim 0.7it is shown that the spin orbit splitting Δ is lower than the bandgap energy Egso that impact ionization is initiated by holes from the Split-off valence band. Forx sim 0.6, Delta sim E_{g}, the rate of the Auger recombination is maximum, corresponding to a resonant impact ionization and to a maximum ratiok = beta / alphawhere α and β are, respectively, the impact ionization coefficient for electrons and holes. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spectroscopic and laser properties of Cr3+-doped Al2(WO4)3and SC2(WO4)3

    Page(s): 1122 - 1126
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1560 KB)  

    Different tungstates and molybdates have been examined in view of their potential application as host lattices for tunable Cr3+solid-state lasers. From chemical, crystal growth, and structural considerations, Cr:Al2(WO4)3and Cr:Sc2(WO4)3are suitable and have been investigated spectroscopically in detail. Due to the acentric site symmetry of the Cr3+laser ions (C1), both compounds exhibit strong absorption and emission cross sections in the 10-19cm2range and therefore belong to the class of high-gain Cr materials. For the first time, laser action has been observed in Cr : Al2(WO4)3at about 800 nm wavelength. Laser experiments with Cr:Sc2(WO4)3are in progress. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Subnanosecond laser pulses from a grazing incidence dye laser

    Page(s): 1113 - 1115
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (768 KB)  

    Dye laser pulses with a duration of 160-350 ps and a spectral width of 0.06 nm were obtained by pumping a grazing incidence dye laser with aQ-switched Nd : YAG laser. The pulse shortening was due to a cavity transient effect which has also been observed in N2laser-pumped dye lasers. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Bistable solitons and optical switching

    Page(s): 1199 - 1204
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1960 KB)  

    Using a particular nonlinearity (the "linear + smooth step" model) as an illustrative example, it is demonstrated numerically that cyclic switching between bistable soliton states of the highly-non-linear (generalized) Schriödinger equation can occur. Some important aspects of the switching process, including the nature and role of the intermediate states, are discussed. This numerical simulation may serve as a model of optical switching between distinctly different soliton states in a nonlinear optical fiber and should stimulate the search for the materials and mechanisms with appropriate nonlinearities. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Rate equation models and wavelength modulation in semiconductor diode lasers

    Page(s): 1127 - 1134
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2944 KB)  

    Various aspects of the rate equation model of a diode laser are discussed in light of the dielectric waveguide model of the laser. Precise definitions of various quantities used in the rate equation model are given. Emphasis is on analysis of wavelength modulation or chirp. It is shown that the so-called linewidth enhancement factor relevant for predicting wavelength modulation must be defined in a way that depends on laser structure and modulation frequency. A number of proposed mechanisms leading to wavelength modulation are compared directly within the framework of the waveguide model. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optical gain and large-signal characteristics of illuminated GaAs MESFET's

    Page(s): 1160 - 1171
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4376 KB)  

    The illuminated large-signal characteristics of a uniformly doped epitaxial GaAs MESFET have been measured when optically gated with an He-Ne laser source. The dependence of the measured optical gains on the applied electrical biases and optical intensity, position, and spot size indicate that the dominant dc gain mechanisms are transit time photoconductivity combined with an effective photovoltaic change in the pinchoff voltage. The photovoltaic change in the pinchoff voltage dominates for high optical power levels, while the photoconductive response dominates for low power levels. Optical gains in the range of 5-10 were measured for the photoconductive regime, while gains in the range of 50-70 were measured for the photovoltaic regime. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Numerical study of currents and fields in a photoconductive detector

    Page(s): 1185 - 1192
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2472 KB)  

    A numerical study of the current, field, and carrier density distributions within a photoconductive detector is presented. The photodetector, an interdigitated Schottky barrier diode, is made with metallic fingers of alternating voltage bias on a thin semiconductor layer grown on a transparent dielectric substrate. The Poisson and continuity equations for electrons and holes are treated in two dimensions. A modified successive line overrelaxation method, faster than the capacitance matrix method, is developed as the Poisson solver. A simple alternative to the Scharfetter-Gummel treatment of current density is also introduced. We investigate steady-state cases with and without optical illumination, and transient responses to picosecond optical pulses. The steady-state current Shows near saturation with increasing voltage, as observed experimentally. The calculated typical response of a silicon detector to a picosecond optical pulse is a current pulse lasting on the order of 10 ps. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Stability of single-mode optically pumped lasers

    Page(s): 1217 - 1232
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5080 KB)  

    We study mode competition in optically pumped lasers with one active laser line. The stability of single-mode operation under one mode pumping (both fields arbitrarily intense) is determined by calculating the saturated laser gain using either a mono- or bichromatic probe. The probe spectra differ dramatically from the single-mode, intense field gain curves occasionally exploited in this context in earlier works. Some features in the spectra are interpreted with the dressed atom picture. The mathematically simpler single probe gain is shown to be a good approximation for large mode spacings. When the strong field induced Rabi flipping is comparable to the mode spacing, however, a bichromatic probe containing two frequencies which are symmetric with respect to the intense mode is usually needed. Typical mono- and bichromatic probe spectra are discussed and parameter regions are explored which give stable single-mode operation. The results are also relevant in general laser instability studies: some aspects due to the strong field induced coherences will be pointed out. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electrooptic modulation of multilongitudinal mode laser diodes: Demonstration at 850 nm with simultaneous data transmission by coherence multiplexing

    Page(s): 1135 - 1144
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3384 KB)  

    An electrooptic modulation method based on signal coding through optical delays larger than the source coherence length is described. The method is illustrated with the simultaneous transmission of several signals by path-difference multiplexing. In this method, the signals are coded as a sequence of optical delays introduced by a series of electrooptic modulators working as delay lines. Decoding is carried out by temporal correlation performed by another sequence of optical delays introduced by birefringent plates, and matched to those used at the emission process. The permissible delays are shown to be ruled by the source coherence length and by the number of laser modes. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Non-frequency-shifted phase conjugation by Brillouin-enhanced four-wave mixing

    Page(s): 1211 - 1216
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1968 KB)  

    We present a theoretical treatment of four-wave mixing (FWM) in a Brillouin-active medium for the case in which the pump waves differ in frequency by approximately twice the Brillouin frequency shift of the medium and in which the probe-wave frequency is approximately the arithmetic mean of the frequencies of the two pump waves. Under these conditions, the conjugate wave produced by the FWM process has the desirable property of being at the same frequency as the probe. We derive the coupled amplitude equations describing this interaction. We solve these equations analytically in the limit of negligible pump depletion and find that large phase conjugate reflectivities are readily achievable. The coupled amplitude equations are solved numerically for the general case, and it is found that large power transfer from the pumps to the output wave is possible. The output wave is shown to be a nearly perfect phase conjugate of the probe wave, even far into the regime where pump depletion effects are important. Our formalism predicts the existence of a parametric instability in the propagation of the pump waves, but good performance is predicted before the onset of this instability. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High-order soliton pulse compression and splitting at 1.32 µm in a single-mode optical fiber

    Page(s): 1193 - 1198
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1704 KB)  

    The optically compressed pulses from a CW mode-locked Nd:YAG laser operating at 1.32 μm have been further compressed through a high-order soliton generation effect in a 40 m length of single-mode dispersion-shifted optical fiber. Two- and three-fold splitting of the soliton pulses have been demonstrated. Experimental compression factors and spectra forN = 3, 5, 7, 9, 11, and 13 solitons have been shown to agree qualitatively with theory. In shorter fiber lengths pulses as short as 33 fs have been generated, corresponding to an over-all compression factor of X2700, the largest reported so far. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Carrier-induced lasing wavelength shift for quantum well laser diodes

    Page(s): 1155 - 1159
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1464 KB)  

    Lasing wavelength was analyzed for quantum well laser diodes (QW-LD's) considering both the bandgap shrinkage effect and the band-filling effect. The bandgap shrinkage effect was calculated by the local density functional method, treating both electron and hole distribution self-consistently. Assuming nok-selection rule, the band-filling effect is larger than the bandgap shrinkage effect when the carrier density is high. The lasing wavelength shifts to the short side as the threshold carrier density increases. QW-LD's with a large threshold carrier density lase at very short wavelength corresponding to the transition between the second sublevel. However, this wavelength is still longer than that expected because of the bandgap shrinkage effect. 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