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Optics and Spectroscopy

Multistability of states of a molecular gas with the V-T relaxation time dependent on the vibrational energy

Vyacheslav A. Trofimov, Yu. V. Troshchiev

Published Jan 1, 2005• 0 citations
Publisher

Abstract

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.

DOI
10.1134/1.1858035

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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.
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.
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 effect of the temperature dependence of the free-electron radiative recombination time on the onset of absorption optical bistability has been considered within the point-charge model. The existence of multistable states and the possibility of reducing by tens of times the switching temperatures and intensities and the differences between their corresponding values have been revealed. This permits one to reduce considerably the energy expended per switching event and, hence, to increase the speed of response of a bistable system.
We discuss a model of selective absorption of infrared radiation by an anharmonic molecular vibrational mode. The effects of the rotational sublevels and of the energy dissipation mechanisms are described phenomenologically. We show that in the context of our model the absorption process is described by coupled nonlinear equations for the complex vibrational amplitude and for the average excitation quantum number. Two distinct dynamic regimes (coherent and adiabatic limit) can be identified depending on the relative magnitude of the rotational relaxation time and of the laser pulse duration.
An optically bistable absorption system involving several feedback loops formed by the lateral supply of a fraction of light energy passed through a semiconductor with single-and two-photon absorption is analyzed. It is shown that multistability can be realized in the case of two-photon absorption. The use of several loops makes it possible to significantly reduce energy expenditures on switching and to reduce the switching time by approximately a factor of 10. A method of switching the system from one state to another by varying the reflectivities of side mirrors is proposed.