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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

New methods of formation of switching waves in an optical bistable cavity-free system

Vyacheslav A. Trofimov, Yu. V. Troshchiev

Published Sep 24, 1999• 3 citations
Publisher

Abstract

The basic opportunity of bistable dependencies of medium temperature and vibrational energy of molecules on heat conduction parameter and on normalized VT-relaxation time is shown for light energy absorption at non-ground vibrational levels. Practical realization is possible, particularly, by usage of elliptically defocused beams. As a result there is anew opportunity to form high temperature domains in the any section of medium, using defocused light beams. The bistability property, discussed within the framework of the point model, is confirmed by modeling of a light pulse propagation in optically non-uniform vessel with molecular gas.

DOI
10.1117/12.364540

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The basic opportunity of bistable dependencies of medium temperature and vibrational energy of molecules on heat conduction parameter and on normalized VT-relaxation time is shown for light energy absorption at non-ground vibrational levels. Practical realization is possible, particularly, by usage of elliptically defocused beams. As a result there is anew opportunity to form high temperature domains in the any section of medium, using defocused light beams. The bistability property, discussed within the framework of the point model, is confirmed by modeling of a light pulse propagation in optically non-uniform vessel with molecular gas.
The possibility of realizing multistability of states under the action of IR radiation on a molecule under conditions of nonlinear absorption of light energy and dependence of the V-T relaxation time on its vibrational energy is shown. A two-wave optically bistable arrangement potentially having a highly contrasting range of states is proposed. The nonlinear dependence of the V-T relaxation time on the vibrational energy is shown to allow the realization of optical bistability based on the absorption of light energy at the frequency of the fundamental vibrational transition.
Problems of stability of bistable states in aspect of information storage are considered. Influence of temperature dependencies of absorption coefficient and relaxation time of free electrons onto realization of bistability and possibility of self-switching were investigated in context of a point-wise model. As a result various regimes of interaction of light pulse with the semiconductor were revealed due to the numerical simulation and parametrical analysis. Principal possibility of instability of both bistable states, which promote development of self- switching, was first shown in the model.
Physical reasons for the development of spatial and temporal instabilities realizing in optical bistability (OB) cavity- free systems are analyzed. It is shown that there are certain types of instability. We describe diffraction instability of light beams due to its propagation through a boundary on a high absorption domain. We consider instability generated by nonlinear dependence of a relaxation time of excited states of atoms (molecules) on vibration temperature or on room temperature under the condition of presence (or absence) of nonlinear absorption. We investigate instability due to an influence of laser- induced electric field and instability caused by the delay in a scheme with additional lateral feedback and instability in a scheme with mirror having a hole at its axis caused by dynamical lenses.
An optically bistable two-wave scheme implemented upon absorption of light energy by a molecular gas is proposed. Switching from one state into another is performed by a pulse at one of the two frequency. At the same time, the medium is continuously exposed to light of another frequency. It is shown that, under certain conditions, the system switched to the upper state remains in this state for an arbitrarily long time. This effect makes it possible to implement long-term dynamic memory and logical operations. A two-wave action on a molecular gas also decreases several tens or hundreds of times the intensities necessary for switching a system from one state to another.
We report about the dual-wave optical bistable scheme realized on the base of light energy absorption by molecular gas. Switching from one state to another takes place due to optical pulse action on one of the frequencies. Under certain conditions after switching of system to the upper state, it remains in this state as much as long. That allows to realize long-time dynamic memory and various logic operations. Using of dual-wave action on molecular gas leads as well to decreasing in tens and hundreds times the intensity at which switching of system takes place. The obtained results can find wider applications, and not only to considered object - molecular gas, since we do not use its specific properties in our report. The results can be applied, for example, to a polymer, that is more preferable to practice.
The possibility of formation of a basic (stationary) and an additional (moving) high-absorption domain in an optically bistable system, based on high absorption, is demonstrated. A semiconductor with the absorption coefficient dependent on the concentration of free charge carriers in the conduction band is considered as a nonlinear medium. Under certain conditions, an optical beam passing through the stationary high-absorption domain acquires an annular profile and, after traveling a certain distance, transforms into a Gaussian beam with an intensity on the axis sufficient to switch the medium-beam system to the upper state. This moving domain periodically disappears and reappears due to diffusion processes.