An exact analysis is presented of the steady-state stability of a semiconductor laser subjected to feedback from a phase-conjugate mirror. Reduced stability occurs at low feedback whenever the effective external delay time is an integer multiple of the relaxation oscillation period. The role of a finite response time of the mirror is to enhance drastically the steady-state stability.

We present experimental and numerical studies of the dynamics of two delay-coupled device-identical semiconductor lasers. We concentrate on the regime of short delay times where the coupling delay is comparable to the period of the relaxation oscillation frequency. We find characteristic scenarios in the intensity dynamics depending on the spectral detuning and the coupling phase. For small spe...

We analyze oscillations of intermediate neutrinos in terms of the scattering of particles described by Gaussian wave packets. We study a scalar model as in a previous paper (I) but in realistic situations, where the two particles of the initial state and final state are wave packets and neutrinos are in the intermediate state. The oscillation of the intermediate neutrino is found from the time ...

Mitotic spindle is the main subcellular structure that accomplishes the chromosome segregation between daughter cells during cell division. However, how mitotic spindles sense and control their size, position and movement inside the cell still remains unclear. In this paper, we focus on the size effects of mitotic spindles, i.e., how cell size controls various interesting phenomena in the metap...

Revised We present four-dimensional and ¯ve-dimensional models for classical cross-coupled LC oscil-lators. Using these models, sinusoidal oscillation condition, frequency and amplitude can be found. Further, undesired behaviors such as relaxation-mode oscillations and latchup can be explained and detected. A simple graphical design procedure is also described.

Relaxation oscillations comprise a large class of nonlinear dynamical systems, and arise naturally from many physical systems such as mechanics, biology, chemistry, and engineering. Such periodic phenomena are characterized by intervals of time during which little happens, interleaved with intervals of time during which considerable changes take place. In other words, relaxation oscillations ex...

Optical feedback from an external cavity containing an element of dispersive loss was used to reduce the amplitude noise of a semiconductor laser. At feedback levels of Pfb/P0t 1O_2, a maximum amplitude noise reduction of 16 dB was measured close to threshold but the potiential for reduction was reduced considerably at higher injection currents as the laser noise approached the shot noise limit...

In this paper the transient control using effect of steady and relaxation oscillation in optical fiber based on neural networks and hardware implementation is described. The inherent optical feedback by the backscattered Stokes wave in optical fiber leads to instabilities in the form of optical chaos. The controlling of chaos induced transient instability in Brillouin-active fiber based smart s...

We investigate the role of polarization-photon coupling (specifically, polarization-oscillation-induced radiation electric field) in excitation ferroelectric thin films by an ultrafast terahertz field pulse. Analytical formulas are developed to predict how frequencies and relaxation time three-dimensional soft mode phonons (intrinsic polarization oscillation) modulated epitaxial strain. Ultrafa...

We developed an iteration algorithm for open resonator simulation and employed it in studying the dynamics of mode formation. Simulations of an axially symmetrical empty resonator rely on an analytical description of radiation diffraction from a narrow ring. Reflection of an incident wave with a specified amplitude-phase distribution from the mirror is calculated by the Green function method. T...