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Quantum Electronics, IEEE Journal of

Issue 5 • Date May 2013

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Displaying Results 1 - 15 of 15
  • [Front cover]

    Page(s): C1
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  • IEEE Journal of Quantum Electronics publication information

    Page(s): C2
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  • Table of contents

    Page(s): 445 - 446
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  • 650-nm All-Polymer Thermo-Optic Waveguide Switch Arrays Based on Novel Organic–Inorganic Grafting PMMA Materials

    Page(s): 447 - 453
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2466 KB) |  | HTML iconHTML  

    All-polymer thermo-optic (TO) waveguide switch arrays at 650-nm wavelength based on novel organic-inorganic grafting poly(methyl methacrylate) (PMMA) materials are successfully designed and fabricated. The thermal stability and optical properties of the sol-gel materials are studied. The TO coefficient of organic-inorganic grafting PMMA core material is obtained as -1.65×104 °C-1. The characteristic parameters of the embedded waveguide and arrayed electrode heaters are carefully designed and simulated. The propagation loss of a 4-μm wide straight waveguide is 0.85 dB cm-1. The M-Z interferometer TO switch on-off time is 600 μs. The extinction ratio is ~ 8.2 dB and the applied electric power as the switching power is ~ 22.6 mW. The device could have great potential in biomedical applications. The technique could be well suited for polymer optical fiber integrated network systems. View full abstract»

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  • High Peak Power, Passively Q-Switched Yb:YAG/Cr:YAG Micro-Lasers

    Page(s): 454 - 461
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1756 KB) |  | HTML iconHTML  

    A high peak power (>MW), passively Q-switched Yb:YAG/Cr:YAG micro-laser end-pumped by fiber-coupled 120-W QCW LDs (Repetition rate <; 100 Hz) is developed. The convex output coupler with a curvature of -2 m successfully enlarges the fundamental mode size in the micro-laser cavity, and the output pulse energy increases to 3.6 mJ at a Cr:YAG initial transmission of 89% without optical damage. The TEM00 transverse mode and the single-frequency oscillation are confirmed. The pulse duration is 1.3 ns, and then the peak power is estimated as 2.8 MW. To our knowledge, these are the highest pulse energy and peak power ever reported in Yb:YAG/Cr:YAG micro-lasers. The Yb:YAG rod with 5 at.% Yb concentration and 4.2-mm thickness keeps more than 80% single-pass pump absorption ranging from 15°C to 45 °C in LD temperature. On the other hand, the characteristic temperatures of Yb:YAG/Cr:YAG and Nd:YAG/Cr:YAG lasers were estimated as 110 and 278 K, respectively. This means that the ratio of the increase in threshold pump energy to temperature of a Yb:YAG/Cr:YAG laser is twice or higher than that of a Nd:YAG/Cr:YAG laser due to a quasi-3-level system of Yb:YAG. View full abstract»

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  • Extending the 1-D Hovel Model for Coherent and Incoherent Back Reflections in Homojunction Solar Cells

    Page(s): 462 - 470
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (685 KB) |  | HTML iconHTML  

    In this paper we extend the analytical drift-diffusion model, or Hovel model, to model the electrical characteristics of solar cells incorporating a back mirror. We use a compact summation approach to derive modified optical generation functions in Homojunction solar cells, considering both coherent and incoherent reflections from the back reflector. These modified generation functions are then used to derive analytical formulae for the current-voltage characteristics of mirrored solar cells. We simulate the quantum efficiency of a simple GaAs np diode with a planar gold back reflector, and compare the results with the standard Hovel model using a generation function given by the Beer-Lambert law. Finally, we use the model to simulate the performance of a real GaAs solar cell device fabricated using an epitaxial-lift-off procedure, demonstrating excellent agreement between the simulated and measured characteristics. View full abstract»

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  • Optimal Design of Hexagonal Multiphase Talbot Array Illuminator Based on PPLN

    Page(s): 471 - 476
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2004 KB) |  | HTML iconHTML  

    We theoretically and experimentally study a hexagonal multiphase Talbot array illuminator based on periodically poled LiNbO3 crystal, in which phase shift is electro-optically tunable by controlling an external electric field. Numerical simulation revealed the effects on intensity distribution of diffraction field from array duty cycle, external electric field and diffraction distance. The higher light compression ratio can be obtained by adopting suitable duty cycle and diffraction distance under lower applied electric field. The highest light compression ratio can be realized by the optimal parameters, including array duty cycle of 71%, phase difference of 0.75π and diffraction position of 0.20 times Talbot distance. The experiment results correspond well with the simulation results. View full abstract»

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  • Design of a Wavelength Selective Medium by Graded Index Photonic Crystals

    Page(s): 477 - 484
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (680 KB) |  | HTML iconHTML  

    In this paper, a novel technique for spatial wavelength division using graded index photonic crystals (GRIN PCs) is proposed. The designed GRIN PC structure with hyperbolic-secant refractive index profile at a fixed frequency generates spatial shifts in the longitudinal direction with respect to different incident wavelengths so that distinct path trajectories are followed by propagating beams through the graded medium. Due to gradual variation of the refractive index profile (incremental decrease), an incident beam with an appropriately selected wavelength undergoes continuing refraction and finally, total internal reflection (TIR) occurs at the turning point. Due to the wavelength-dependency characteristic of GRIN PCs, TIR takes place at different positions for different wavelengths and thus, light wave emanates from the GRIN medium at different locations with different exit angles. It is revealed that the designed structure can work in three distinct frequency regimes and is able to separate a certain number of incident beams with different wavelengths, viz. from three to seven different wavelengths. This condition enables the deployment of the GRIN PC configuration for the design of wavelength selective media. View full abstract»

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  • Pulsed Gating With Balanced InGaAs/InP Single Photon Avalanche Diodes

    Page(s): 485 - 490
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    We demonstrate balanced InGaAs/InP single photon avalanche diodes operated in gated mode for a data transmission rate of up to 20 MHz. The common-mode signal cancellation realized with the balanced configuration enabled detection of small avalanche pulses. For a laser repletion rate of 20 MHz at 240 K, the dark count probability for a photon detection efficiency of 13% is $1.9times 10^{-5}$. The afterpulse probability is 0.3% for a 2 ns pulse width, hold-off time of 20 ns, and 10% PDE, at 240 K. View full abstract»

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  • Time-Domain Analysis of Third-Order Quantum-Dot-Based Laterally-Coupled Distributed Feedback Lasers Using Travelling-Wave Approach

    Page(s): 491 - 498
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (717 KB) |  | HTML iconHTML  

    In this paper, we present a time-domain (TD) coupled model suitable to investigate high-order λ/4 phase-shift grating quantum-dot (QD) based laterally-coupled distributed feedback (LC-DFB) laser. First, by integrating the Streifer's coefficients, we include the effects of radiation and evanescent modes into the TD coupled wave equations, and hence we investigate the effect of the radiation modes. Then, via a well-established set of rate equations coupled with the travelling field propagation equations, population dynamics in the QD region are modeled and the homogeneous and inhomogeneous broadening of, respectively, the whole QD ensemble and each QD inter-band transition are properly taken into account in the model. Finally, we consider the coupling between forward and backward electric fields due to the grating via the travelling-wave approach. This approach advances the impact of radiating partial waves in high-order QD-LC-DFB lasers. It is shown that, in particular for third-order rectangular grating, longitudinal spatial hole-burning is highly reduced, high single mode suppression ration (60 dB) is obtained and larger frequency modulation is achieved thanks to the fine engineering of the grating features and the particular properties of QD. Eventually, such results highlight the beneficial effect of considering high-order grating QD-LC-DFB lasers for better longitudinal-mode discrimination and high device performances. View full abstract»

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  • Special issue of the IEEE/OSA Journal of Lightwave Technology on optical interconnects

    Page(s): 499
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  • Call for papers - Special issue of the IEEE Journal on selected topics in quantym electronics on nanobiophotonics

    Page(s): 500
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  • Blank page

    Page(s): i - ii
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  • IEEE Journal of Quantum Electronics information for authors

    Page(s): C3
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  • [Blank page - back cover]

    Page(s): C4
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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