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

Photoinduced amplification of a subharmonic of light and photoelectric instability in glass

M. K. Balakirev, Liubov I. Vostrikova, Vitalii A Smirnov

Published Mar 15, 1999• 0 citations
Publisher

Abstract

Observations of new physical phenomena, a photoinduced amplification of subharmonic of light in glass and instability of preliminarily induced optical anisotropy by illumination of medium to coherent radiation, are produced. Connection between phenomena is adduced. Physical models of phenomena taking into account of coherent photovoltaic effect are offered.

DOI
10.1117/12.342342

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Observations of new physical phenomena, a photoinduced amplification of subharmonic of light in glass and instability of preliminarily induced optical anisotropy by illumination of medium to coherent radiation, are produced. Connection between phenomena is adduced. Physical models of phenomena taking into account of coherent photovoltaic effect are offered.
When a light beam propagates through an ensemble of two-level quantum systems, the resonant interaction between these systems and the radiation field may be described by a complex susceptibility. Even if the medium is of a type ordinarily considered isotropic, the susceptibility will be a tensor. In this paper, explicit expressions for the elements of this tensor are derived from quantum-statistical mechanics. A physical explanation of the induced anisotropy is given, and the experimental conditions under which it can be neglected are described.
A review of experimental and theoretical studies on radiative processes induced by a bichromatic (two-frequency) laser radiation in atoms, molecules, and solids is presented. The optical excitation of matter is considered at transitions of different types: bound—bound, bound—free, and free—free. A special attention is devoted to the possibility of the coherent control of the basic characteristics of radiative phenomena by varying the relative phase of monochromatic components of radiation. It is shown that this method opens up new possibilities for controlling photoinduced processes.
The control of the optical properties of a medium by atomic coherence and quantum interference effects is an important area of research, not only for its fundamental aspects in the understanding of radiation and matter interaction, but also for its potential applications in the design of optical devices. Atomic coherence can emerge in a medium through the coupling of a strong coherent field to an atomic transition. This coupling affects the optical properties of the medium in a very interesting ways. For example, it may yield light amplification without population inversion. Also, it can modify the traditional dispersion of an optical medium in such a way that maximum variations of the refractive index occur around a spectral region of vanishing absorption. In the first part of this work we investigate some fundamental aspects of this coherent dynamics. We investigate how this non-inversion gain is affected by the presence of atomic motion. The coherent interaction between atom and radiation can lead to the interference between optical paths of decay. We report on an atomic setting where the interference structures depend upon the phase of the coherent field, an new effect which is absent in other resonance fluorescent phenomena. As a potential application, we investigate a novel approach for the modulation of optical signal. This approach consists of injecting atomic coherence in the medium in order to tailor its optical properties so it is a more suitable medium for modulation.