Citations Only: Recent submissions
Now showing items 381-400 of 990
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Quantum collapses and revivals in a nonlinear Jaynes-Cummings model
(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 ... -
Stark effect in nonlinear Jaynes-Cummings models
(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 ... -
Frequency-to-voltage converter based on Bloch oscillations in a capacitively coupled GaAs-GaxAl1-xAs quantum well
(American Physical Society, 1993-09-15)A charged capacitor which is placed with a semiconductor in a closed loop will normally discharge in a characteristic time τ=1/RC. We show, however, that if a semiconductor of high purity is subjected to a rf bias with ... -
Synchronization of chaotic diode resonators by occasional proportional feedback
(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 ... -
The Relationship between the magnitudes of SSR(X(2)) and SSR(X(2)|X(1)): a geometric description
(American Statistical Association, 1993-02)We use geometric methods to investigate the relative magnitudes of SSR(x(2)), the sum of squares for regression on x(2) alone, and SSR(x(2)|x(1)), the increase in the regression sum of squares resulting from the addition ... -
A mathematical model of retinal neovascularization
(Elsevier Science B.V., 1999-01)A mathematical model based on diffusion equations is presented, which directly relates the production of Vascular Endothelial Growth Factor (VEGF) in the retina to oxygen concentration and consumption, the capillary density ... -
Mechanism for period-doubling bifurcation in a semiconductor laser subject to optical injection
(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 ... -
Synchronization and control in a unidirectionally coupled array of chaotic diode resonators
(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 ... -
Motion of the wave-function zeros in spin-boson systems
(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 ... -
Period-doubling cascades and chaos in a semiconductor laser with optical injection
(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
(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 ... -
Synchronization of chaotic resonators based on control theory
(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 ... -
Instabilities and chaos in optically injected semiconductor lasers
(American Institute of Physics, 1995-11-06)We have experimentally obtained and theoretically analyzed a systematic map of the various instabilities induced in a semiconductor laser subject to strong optical injection as the amount of optical injection power and ... -
Controlling chaos may induce new attractors in an optical device
(Elsevier Science, B.V., 1995-04-01)The logistic map has been used to describe period doubling bifurcations for periodically modulated lasers. It also represents an asymptotic approximation of Ikeda's map for a passive ring cavity. Because various control ... -
Cavity enhancement of resonant frequencies in semiconductor lasers subject to optical injection
(American Physical Society, 1995-12)The injection of an optical signal into a semiconductor laser biased near or above the lasing threshold modifies the coupling between the free carriers and the intracavity field. The detuning between the frequency of the ... -
History-dependent control of unstable periodic orbits
(American Physical Society, 1994-09)We present a method of stabilizing unstable periodic orbits in systems whose natural time scales are on the order of or faster than the time it would take for the experimental implementation of the Ott-Grebogi-Yorke (OGY) ... -
Lang and Kobayashi phase equation
(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 ... -
Experimental demonstration of antimonotonicity: the concurrent creation and destruction of periodic orbits in a driven nonlinear electronic resonator
(American Physical Society, 1996-08-26)We have experimentally demonstrated antimonotonicity, the concurrent creation and destruction of periodic orbits in a driven nonlinear electronic resonator. A manifestation of antimonotonicity in one-dimensional systems ... -
Models of shrinking clusters with applications to epidermal wound healing
(Elsevier Science B.V., 1997-03)Models of growing clusters, such as the Eden model and Diffusion Limited Aggregation (DLA), have been widely used to describe a variety of natural growth processes. In this paper, we develop models of shrinking clusters ... -
Low pump limit of the bifurcation to periodic intensities in a semiconductor laser subject to external optical feedback
(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 ...