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Quantum Electronics

Nonreciprocal optical effects in moving periodic absorption and amplification gratings

О. Е. Наний, D D Shcherbatkin

Published May 31, 2001• 0 citations
Publisher

Abstract

The nonreciprocal amplitude and phase effects emerging upon the passage of counterpropagating light waves through moving periodic absorption or amplification gratings are studied theoretically. Analytic expressions are derived for amplitude and phase nonreciprocity. It is shown that the maximum phase nonreciprocity corresponds to the incidence of light waves on a moving grating at the Bragg angle.

DOI
10.1070/qe2001v031n05abeh001979

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The nonreciprocal amplitude and phase effects emerging upon the passage of counterpropagating light waves through moving periodic absorption or amplification gratings are studied theoretically. Analytic expressions are derived for amplitude and phase nonreciprocity. It is shown that the maximum phase nonreciprocity corresponds to the incidence of light waves on a moving grating at the Bragg angle.
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A nonreciprocal ring optical resonator with the simplest type of nonuniformity in the form of two interacting scatterers is considered. A boundary problem of a periodic type allowing one to write the characteristic equation for determining eigenfrequencies is formulated. Analytic expressions for eigenfrequencies and the distribution coefficient of travelling waves in the mode are derived under the assumption of relative smallness of the reflection coefficient and the nonreciprocity parameter. The peculiarities of splitting these frequencies and the structure of the eigenfrequencies (resonator modes) corresponding to them are discussed.
A theoretical analysis is made of the transformation of light waves by optically induced amplitude-phase gratings of different order in a saturable absorbing medium. Allowance is made for gratings appearing; due to the absorption saturation and inhomogeneous heating of the medium. It is shown that, under certain conditions, the higher-order gratings may play a considerable role in the diffraction process. The contributions made by multistage and direct mechanisms to the n-th order diffraction are calculated. Estimates are obtained of the conditions which must be satisfied by the intensity and duration of radiation pulses, as well as by the optical properties and thickness of the absorbing medium, for these contributions to be comparable.
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