Reversed Switching in a Two-Channel Optical Bistable System

Surya P. Tewari, Saad S. M. Hassan

We have developed, ab initio, a theory for the interaction of coherent laser light in three-photon resonance with two effective levels of a multilevel atom. The theory is developed to consider the optical bistability of homogeneously broadened, three-photon, resonant multilevel atoms inside a ring cavity. It is shown that optical bistable behaviour in the fundamental and the generated third harmonic can be obtained using, for example, Na atoms. The device may be useful in constructing two-channel, optical bistable switches. In certain nonlinear regimes it may be possible to obtain reversed switching between the fundamental and the third harmonic bistability.

A. Daunois, J.‐Y. Bigot

Nasser N. Peyghambarian, H. M. Gibbs, Daniele Hulin +3 more

Seyed Morteza Mousavi, Mohammad Mahmoudi

We present a novel approach to achieving intrinsic optical bistability and multistability through the interplay between saturable and reverse saturable absorption. Our findings reveal that the stable points on the optical bistability curve align with the switching points of intensity-dependent nonlinear absorption. By analyzing the optical properties of a four-level cascade quantum system, we demonstrate that these switching behaviors can be triggered by applying laser fields to induce nonlinear absorption. Furthermore, we propose a comprehensive model to describe the intensity-dependent nonlinear absorption within this quantum system. Finally, it is shown that the optical bistability switches to the multistability when the detuning of applied fields exceeds the multi-photon resonance condition.

Nikolai N Rozanov, Федоров Анатолий Валентинович

Hui Wang

The characteristic of optical bistability switching of azobenzene molecules is discussed.First,we compute the coefficient of reverse saturable absorption based on the model of photoisomerization of azobenzene molecules.Second,we simulate and compute the process of bistability switching based on reverse saturable absorption.The result shows that the reverse saturable absorption based on photoisomerization of azobenzene molecules can realize full optical switches of bistability.We also discusse the Trans isomer σT,the Cis isomer σC and the thermal constant K to the optical bistability influence.