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Technical Physics Letters

Formation of multiple longitudinal high-absorption kinks under the action of collimated gaussian light beams

A. V. Vysloukh, Vyacheslav A. Trofimov

Published Feb 1, 2000• 1 citation
Publisher

Abstract

The possibility of formation of several longitudinal kinks under the action of a collimated Gaussian light beam in a medium with absorptive cavityless optical bistability is demonstrated to be possible. The beam is essentially affected by diffraction. The domain formation is caused by the focusing of an annular beam into which the Gaussian beam is transformed due to nonlinear light absorption at small depths.

DOI
10.1134/1.1262761

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The possibility of formation of several longitudinal kinks under the action of a collimated Gaussian light beam in a medium with absorptive cavityless optical bistability is demonstrated to be possible. The beam is essentially affected by diffraction. The domain formation is caused by the focusing of an annular beam into which the Gaussian beam is transformed due to nonlinear light absorption at small depths.
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.
It is shown that several longitudinal domains of high absorption are formed under certain conditions in an optically bistable element based on increasing absorption under the action of a hyper-Gaussian light beam. This is caused both by the transformation of the initial beam profile into a tubular distribution and by the diffraction of light by a nonuniform boundary of the region of high absorption. The analysis of dynamics showed the possibility of formation of quasi-stationary regions with high absorption, which exist during a certain time. These effects can lead to false data recording in three-dimensional optical recording systems.
The dynamics of switching waves in optically bistable systems on the basis of growing absorption is analyzed by quasi-optical description. A new scenario of kinks moving towards the optical beam under the action of a tubular optical beam is described. As opposed to an originally Gaussian beam focused on to the entrance face, a high intensity at the exit from the medium under the action of a collimated tubular beam is achieved due to the transformation of its profile. The structures formed are shown to be identical for both cases of action. The scenario of the development of moving switching waves found in this work is an alternative to that known in the literature earlier, which developed under the action of focused Gaussian beams and was analyzed with no regard for the variations of the phase of the optical beam.
Koch et al.1 have solved the transport equations for the light intensity and the excitation density for a system that exhibits increasing absorption2 optical bistability. Under pulse operation a kink in the excitation density is predicted, which moves discontinuously in the beam direction and causes a saw-tooth variation in the transmitted intensity. Herein is reported the first observation of these kinks which emphasize the local nature of increasing absorption optical bistabillty. Kinks illustrate well the intrinsic difference between increasing absorption optical bistability and optical bistability that depends on external feedback, where a longitudinal discontinuity cannot occur.