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Optics and Spectroscopy

The formation of moving kinks under the effect of collimated tubular optical beams

A. V. Vysloukh, Vyacheslav A. Trofimov

Published May 1, 2000• 1 citation
Publisher

Abstract

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.

DOI
10.1134/1.626867

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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.
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.
Recently, we predicted1) that partial sample switching can occur in a system showing resonatorless optical bistability due to induced absorption. For an increasing intensity of the incident light, a stepwise propagation of the kink in the excitation profile takes place. In the meantime, the corresponding modulation of the transmitted light has been observed in sharp-cut color filters2). Here, we present an in-depth study of the structure, formation and motion of the kinks. We supplement and expand our original numerical investigations1) by detailed analytical studies. We show that the kink profile may be approximated by a soliton structure if the diffusion of the excitation density is taken into account. Furthermore, we present some simple estimates for the kink propagation.