Second-order time fluctuations in optical bistability

The master equation for a hybrid optical bistability is numerically solved and the results obtained for the second order time fluctuations are compared with the results derived from the theory.     

Removal of single-atom optical bistability by quantum fluctuations

The dynamics of the quantum-statistical properties of the radiation of an atom in a cavity interacting with an external coherent field is investigated. A high level of quantum fluctuations of the field in the cavity is shown to destroy optical bistability in the multiatom case. Photon-number fluctuations and the spectral dispersion of the canonically conjugate quadratures of the field inside and outside a cavity are calculated. It is found that in contrast to the multiatom case quadrature squeezing and squeezing of the radiation intensity of a single atom are negligible inside and outside the cavity. Zh. éksp. Teor. Fiz. 115, 2001–2013 (June 1999)     

Simulations of the dynamics of optical bistability with fluctuations

Numerical integrations of the Langevin-equation for the fluctuating light-field in a nonlinear resonator are presented. As an xample, the nonlinearity of the two-photon resonance of the excitonic molecule in semiconductors is treated. Time-dependent switching processes and the response of the system to nonstationary incident fields are investigated with the technique of molecular dynamics simulations. Using many independent realizations of the stochastic process, the time-dependence of the field dostribution function is determined. Furthermore, it is shown that the decay of metastable states can be described by simple exponential decay rates.     

Transients in optical bistability

In this paper we report on both a theoretical model for the transients in optical bistability in a Fabry-Perot cavity and the corresponding experimental results. An analytical calculation permits to predict the shape of the transient curves and the order of magnitude of their time duration in the case of a slow sweep of the length of the cavity. The experiment, which uses the nonlinearity arising from a two-photon transition in rubidium, yields results in good agreement with the theoretical calculation.Work supported by the D.R.E.T.     

光栅光学双稳态

本文报道了一种光栅光学双稳态装置.利用改变一对对称光栅间相对位移,实现了对透过光强的周期性调制.将这样的系统作为传输部分,分别用He-Ne激光和普通白光完成了光学双稳实验.实验结果与理论分析相符.     

Piezooptical optical bistability

A glass fiber piezooptical optical bistability device is reported.Basing on pho-toelastic and strain effects of single-mode fiber,we have realized piezooptical modulation andperformed experiments of optical bistability.     

Self-pulsing in two-cavity optical bistability

We discuss two serially coupled ring cavities which contain media modelled by an ensemble of homogeneously broadened two-state atoms. This system produces pulsed outputs for appropriate CW inputs and values of the cooperativity parameters in the absorptive regime. In particular, self-pulsing occurs when both stable and unstable steady-state output versus input characteristics are everywhere monotomic with positive slope. An analytic requirement for this self-pulsing is obtained in the absorptive case.     

富勒烯分子的光学双稳性

本文采用非线性法布里-珀罗腔的全光光学方法,在C_(60)/C_(70)薄膜中首次观测到双稳开关现象,其开关时间为10ns.     

Fluctuations in multiphoton optical bistability

We show that in multiphoton lasers nonclassical effects are absent, whereas in multiphoton optical bistability the maximum reduction of fluctuations is by a factor of four.     

Nonsecular terms in optical bistability

We investigate the influence of the nonsecular terms on the optical bistability in a photonic-crystal single-atom laser. The nonsecular terms result in a significant reduction of the bistability threshold. The optical bistability can be controlled by adjusting the parameters of the discontinuity in the photon density of states.     

Recent advances in optical bistability

In this paper, recent advances in optical bistability and gating of semiconductors will be reviewed. Nonlinear mechanisms responsible for switching will be described. The advantages of nonlinear etalons for massive parallelism and current problems in performing such operations will be mentioned.     

Effect of lightwave intensity fluctuations on the dynamics of nonresonance optical bistability near exciton resonance

The effect of lightwave intensity fluctuations on absorption bistability in the region of exciton resonances is studied. Below a critical magnitude of the incident laser radiation, bistability of the exciton states is induced by external noise, whereas above this magnitude the effect of external noise shifts the region of bistability to somewhat higher intensities of the incident light. It is shown that the probability of a spontaneous shift of states is exponentially small. Chernovtsy State University, Chernovtsy. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, Vol. 41, No. 12, pp. 94–98, December, 1998.     

Transverse effects in absorptive optical bistability

Absorptive bistability loops are computed for a laser beam with a gaussian input spatial profile incident on a unidirectional ring cavity containing a saturable nonlinear medium. Sharp radially dependent switching with wide bistable loops is predicted for large Fresnel numbers. Intermediate Fresnel numbers result in whole beam switching with significant narrowing of the associated bistable loops. At low Fresnel numbers, bistability can disappear. Radially integrated hysteresis loops differ quantitatively from plane-wave predictions.     

Nonlinear polarization bistability in optical nanowires

Using the full vectorial nonlinear Schr?dinger equations that describe nonlinear processes in isotropic optical nanowires, we show that there exist structural anisotropic nonlinearities that lead to unstable polarization states that exhibit periodic bistable behavior. We analyze and solve the nonlinear equations for continuous waves by means of a Lagrangian formulation and show that the system has bistable states and also kink solitons that are limiting forms of the bistable states.     

Low threshold optical bistability with optical pumping

By use of circularly polarized light we have exploited optical pumping within the Zeeman sublevels of the ground state to obtain optical bistability in sodium vapours with low threshold power (around 1 mW) and a wide tuning range (>12 GHz). Experimental results are presented for different conditions of operation and compared to computer calculations, that include propagation effects and inhomogeneous broadening, based on a three-level atomic model that accounts for optical pumping.CEILAP, Buenos Aires, Argentina     

Critical slowing down in optical bistability

The role of critical slowing down in optical bistability is discussed, taking fully into account the non-linear effects. In particular, we show that the critical slowing down may lead to interesting novel applications, such as compact optical delay lines and electric field to time converters.