Browsing Citations Only by Author "Kovanis, Vassilios"

Now showing items 21-40 of 50

    • Investigation of coupled diode laser dynamics using an electronic analog 

      Sukow, David; Kovanis, Vassilios; Gavrielides, Athanasios (The International Society for Optical Engineering (SPIE), 1999-08)
      We study the behavior of coupled semiconductor lasers using a reduced phase model that captures their essential dynamics yet remains analytically tractable. We design a simple electronic circuit analog, a phaselocked loop, ...

    • Lang and Kobayashi phase equation 

      Alsing, Paul; Kovanis, Vassilios; Gavrielides, Athanasios; Erneux, Thomas (American Physical Society, 1996-06)
      Lang and Kobayashi equations for a semiconductor laser subject to optical feedback are investigated by using asymptotic methods. Our analysis is based on the values of two key parameters, namely, the small ratio of the ...

    • Lang and Kobayashi phase equation and its validity for low pump 

      Erneux, Thomas; Alsing, Paul; Kovanis, Vassilios; Gavrielides, Athanasios (The International Society for Optical Engineering (SPIE), 1996-05)
      An asymptotic theory of Lang and Kobayashi (LK) equations describing a semiconductor laser subject to optical feedback is investigated in detail. We obtain a simple third order, nonlinear, delay-differential equation for ...

    • Largely detuned injection-locked semiconductor lasers 

      Kovanis, Vassilios; Erneux, Thomas; Gavrielides, Athanasios (Elsevier Science B.V., 1999-01-01)
      The equations for a semiconductor laser subject to injection are examined numerically and analytically for large values of the detuning parameter. Our analysis is motivated by recent experimental studies using either ...

    • Linewidth broadening across a dynamical instability 

      Varangis, Petros; Gavrielides, Athanasios; Kovanis, Vassilios; Lester, Luke (Elsevier Science B.V., 1998-12-21)
      We investigate experimentally and theoretically the variation of the emission linewidth of an optically-injected semiconductor laser across a resonant period-doubling bifurcation. Close to the dynamical instability, the ...

    • Localized synchronization in two coupled nonidentical semiconductor lasers 

      Hohl-AbiChedid, Angela; Gavrielides, Athanasios; Erneux, Thomas; Kovanis, Vassilios (American Physical Society, 1997-06-23)
      The dynamics of two mutually coupled but nonidentical semiconductor lasers are studied experimentally, numerically, and analytically for weak coupling. The lasers have dissimilar relaxation oscillation frequencies and ...

    • Low pump limit of the bifurcation to periodic intensities in a semiconductor laser subject to external optical feedback 

      Lythe, Grant; Erneux, Thomas; Gavrielides, Athanasios; Kovanis, Vassilios (American Physical Society, 1997-06)
      The conditions for a bifurcation to periodic intensities (Hopf bifurcation) for low values of the pump current are examined using singular perturbation methods. We show that the frequency of the oscillations at the bifurcation ...

    • Low-frequency fluctuations in external cavity semiconductor lasers: understanding based on a simple dynamical model 

      Prasad, Awadhesh; Lai, Ying-Cheng; Gavrielides, Athanasios; Kovanis, Vassilios (Institute of Physics, 2001-08)
      We investigate the dynamical origin of low-frequency fluctuations (LFFs) in external cavity semiconductor lasers by utilizing a simplified, three-dimensional model derived from the infinite-dimensional Lang-Kobayashi (LK) ...

    • Mechanism for period-doubling bifurcation in a semiconductor laser subject to optical injection 

      Erneux, Thomas; Kovanis, Vassilios; Gavrielides, Athanasios; Alsing, Paul (American Physical Society, 1996-06)
      The single-mode rate equations for a semiconductor laser subject to optical injection are investigated analytically. We determine the first branch of periodic solutions for low values of the injection field. For larger ...

    • Motion of the wave-function zeros in spin-boson systems 

      Ellinas, Demosthenes; Kovanis, Vassilios (American Physical Society, 1995-05)
      In the analytic Bargmann representation associated with the harmonic oscillator and spin coherent states, the wave functions considered as consisting of entire complex functions can be factorized in terms of their zeros ...

    • Mutual entrainment in delay-coupled non-identical semiconductor lasers 

      Hohl-AbiChedid, Angela; Gavrielides, Athanasios; Erneux, Thomas; Kovanis, Vassilios (The International Society for Optical Engineering (SPIE), 1997-06)
      The dynamics of two mutually coupled but non-identical semiconductor lasers are studied experimentally, numerically and analytically for weak coupling. The lasers have dissimilar relaxation oscillation frequencies ...

    • Observation of the concurrent creation and annihilation of periodic orbits in a nonlinear RLC circuit 

      Newell, Timothy; Kovanis, Vassilios; Gavrielides, Athanasios; Bennett, P. (American Physical Society, 1996-10)
      We have numerically investigated and experimentally demonstrated the presence of antimonotonicity: the concurrent creation and destruction of periodic orbits in a driven nonlinear RLC circuit. A simple manifestation of ...

    • Period three limit-cycles in injected semiconductor lasers 

      Gavrielides, Athanasios; Kovanis, Vassilios; Nizette, Michel; Erneux, Thomas; Simpson, Thomas (Institute of Physics Publishing, 2002-02)
      Experiments showing period three intensity oscillations are reported for a semiconductor laser subject to external injection. These oscillations appear close to a period doubling bifurcation of the fundamental laser ...

    • Period-doubling cascades and chaos in a semiconductor laser with optical injection 

      Simpson, Thomas; Liu, Jia-Ming; Gavrielides, Athanasios; Kovanis, Vassilios; Alsing, Paul (American Physical Society, 1995-05)
      We characterize the nonlinear dynamics of a semiconductor laser subject to optical injection. The key characteristics of measured optical spectra are reproduced in calculations based on a single-mode model that includes ...

    • Period-doubling route to chaos in a semiconductor laser subject to optical injection 

      Simpson, Thomas; Liu, Jia-Ming; Gavrielides, Athanasios; Kovanis, Vassilios; Alsing, Paul (American Institute of Physics, 1994-06-27)
      Experimental measurements and a single-mode analysis of a quantum-well laser diode subject to strong optical injection are combined to demonstrate that the diode follows a period-doubling route to chaos. All laser parameters ...

    • Quantum collapses and revivals in a nonlinear Jaynes-Cummings model 

      Cardimona, David; Kovanis, Vassilios; Sharma, Mohinder; Gavrielides, Athanasios (American Physical Society, 1991-04-01)
      We investigate the atomic inversion dynamics when a multilevel atom interacts with a two-mode quantized radiation field in a Raman-type process. By utilizing the rotating-wave approximation and adiabatically eliminating ...

    • Quasiperiodic synchronization for two delay-coupled semiconductor lasers 

      Hohl-AbiChedid, Angela; Gavrielides, Athanasios; Erneux, Thomas; Kovanis, Vassilios (American Physical Society, 1999-05)
      The dynamical behavior of two mutually coupled semiconductor lasers is studied experimentally, numerically, and analytically for weak coupling. The lasers have dissimilar relaxation oscillation frequencies and intensities, ...

    • Regular dynamics of low-frequency fluctuations in external cavity semiconductor lasers 

      Davidchack, Ruslan; Lai, Ying-Cheng; Gavrielides, Athanasios; Kovanis, Vassilios (American Physical Society, 2001-05)
      It is commonly believed that the dynamics responsible for low-frequency fluctuations (LFF’s) in external cavity semiconductor lasers is stochastic or chaotic. A common approach to address the origin of LFF’s is to investigate ...

    • Self-organization of coupled nonlinear oscillators 

      Gavrielides, Athanasios; Kottos, Tsampikos; Kovanis, Vassilios; Tsironis, George (EDP Sciences, 1998-12-01)
      The effects of impurities introduced into a lattice of strongly coupled oscillators are studied. Contrary to our expectations, a single impurity can control the chaotic behavior of a long array of chaotic oscillators and ...

    • Spatiotemporal organization of coupled nonlinear pendula through impurities 

      Gavrielides, Athanasios; Kottos, Tsampikos; Kovanis, Vassilios; Tsironis, George (American Physical Society, 1998-11)
      We study the effect of impurities introduced into a lattice and their ability to control the dynamical behavior of arrays of coupled nonlinear chaotic oscillators. In particular we show that under certain conditions a ...