Browsing Citations Only by Author "Kovanis, Vassilios"

Now showing items 41-50 of 50

    • Stability and bifurcations of periodically modulated, optically injected laser diodes 

      Nizette, Michel; Erneux, Thomas; Gavrielides, Athanasios; Kovanis, Vassilios (American Physical Society, 2001-02)
      Recent experiments using lasers subject to external injection

    • Stark effect in nonlinear Jaynes-Cummings models 

      Cardimona, David; Kovanis, Vassilios; Sharma, Mohinder (American Physical Society, 1993-02)
      We investigate the effect of the Stark shifts on the atomic-inversion dynamics when a multilevel atom interacts with a two-mode quantized radiation field. We utilize Hamiltonians obtained by adiabatically eliminating all ...

    • Subharmonic transition in an optically injected semiconductor laser: theory and experiments 

      Gavrielides, Athanasios; Erneux, Thomas; Kovanis, Vassilios; Alsing, Paul; Simpson, Thomas (Institute of Physics, 1997-08)
      The equations for a semiconductor laser subject to detuned optical injection are analysed using asymptotic methods. We derive a third-order equation for the phase of the laser field which is then investigated for small ...

    • Synchronization and control in a unidirectionally coupled array of chaotic diode resonators 

      Mozdy, Eric; Newell, Timothy; Alsing, Paul; Kovanis, Vassilios; Gavrielides, Athanasios (American Physical Society, 1995-06)
      We experimentally investigate the synchronization of a one dimensional array of unidirectionally coupled chaotic diode resonators. Though care is taken to match diode elements as closely as possible, slight differences in ...

    • Synchronization of chaotic diode resonators by occasional proportional feedback 

      Newell, Timothy; Alsing, Paul; Gavrielides, Athanasios; Kovanis, Vassilios (American Physical Society, 1994-03-14)
      Synchronization of a pair of chaotic diode resonators has been experimentally achieved by applying a minute feedback signal to the amplitude of the drive voltage of a slave resonator. The signal is proportional to the ...

    • Synchronization of chaotic resonators based on control theory 

      Alsing, Paul; Gavrielides, Athanasios; Kovanis, Vassilios (American Physical Society, 1995-04)
      We have investigated experimentally and computationally a synchronization scheme, based on control theory, for the case of two nearly identical chaotic diode resonators. From the experimentally captured time series we ...

    • Synchronization of coupled semiconductor lasers 

      Hohl-AbiChedid, Angela; Erneux, Thomas; Gavrielides, Athanasios; Kovanis, Vassilios (The International Society for Optical Engineering (SPIE), 1998-07)
      The dynamics of two mutually coupled semiconductor lasers is studied experimentally and numerically for weak coupling. The two lasers are pumped at different levels and have dissimilar free-running relaxation oscillation ...

    • Synchronous Sisyphus effect in diode lasers subject to optical feedback 

      Gavrielides, Athanasios; Newell, Timothy; Kovanis, Vassilios; Harrison, Robert; Swanston, N.; Yu, Dejin; Lu, Weiping (American Physical Society, 1999-08)
      Diode lasers exposed to moderate optical feedback, when biased near threshold, exhibit low-frequency intensity fluctuations in the RF spectrum that materialize as dropout events in the intensity time series. We recorded ...

    • Unfolding of the period-two bifurcation in a fiber laser pumped with two modulation tones 

      Newell, Timothy; Gavrielides, Athanasios; Kovanis, Vassilios; Sukow, David; Erneux, Thomas; Glasgow, S. (American Physical Society, 1997-12)
      The effect of a small second frequency component on a pump modulated neodymium fiber laser is investigated experimentally and theoretically. This term, whose frequency is exactly half the primary driver, incites an unfolding ...

    • Using neural networks for controlling chaos 

      Alsing, Paul; Gavrielides, Athanasios; Kovanis, Vassilios (The International Society for Optical Engineering (SPIE), 1994-03)
      A feed-forward backpropagating neural network is trained to achieve and maintain control of the unstable periodic orbits embedded in a chaotic attractor. The controlling algorithms used for training the network are based ...