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

Laser-induced phase transitions in liquid crystals and distributed feedback-fluctuations, energy exchange, and instabilities: squeezed polarized states and intensity correlations

Sergei M Arakelyan, Yu. S. Chilingaryan, Roman B. Alaverdyan, A. P. Alodjants, V. E. Drnoian, A. S. Karayan

Published Apr 1, 1991• 0 citations
Publisher

Abstract

Laser-induced bulk gratings and temporal instabilities of nonlinear wave processes with different components of light polarization have been studied in the liquid crystals (LC). A mirrorless feedback arises because of the non-local nonlinear response of an anisotropic elastic medium on the external field. The multiplicative nature of the molecular fluctuations in the LC under external field are discussed and the light-induced reorientation effects in this medium can be considered as a noise-induced phase transition. . The quantum aspects of behavior of the radiation fluctuations for passing through the LC light are considered. A new method of formation of quantum states of the light in the linear system at dynamic diffraction is discussed for the first time. The squeezed states of the field and the photon superbunching are obtained for two geometries (Bragg and Laue) of diffraction in spatially periodic medium. The approach gives a new opportunities for a verification of quantum properties of the light in experiment.

DOI
10.1117/12.47492

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Laser-induced bulk gratings and temporal instabilities of nonlinear wave processes with different components of light polarization have been studied in the liquid crystals (LC). A mirrorless feedback arises because of the non-local nonlinear response of an anisotropic elastic medium on the external field. The multiplicative nature of the molecular fluctuations in the LC under external field are discussed and the light-induced reorientation effects in this medium can be considered as a noise-induced phase transition. . The quantum aspects of behavior of the radiation fluctuations for passing through the LC light are considered. A new method of formation of quantum states of the light in the linear system at dynamic diffraction is discussed for the first time. The squeezed states of the field and the photon superbunching are obtained for two geometries (Bragg and Laue) of diffraction in spatially periodic medium. The approach gives a new opportunities for a verification of quantum properties of the light in experiment.
The physical aspects of the manifestation of optical bistability, instabilities, and stochasticity in strongly nonlinear media in the form of liquid crystals subjected to laser radiation fields are discussed. The stress is on experimental research. Optical bistability and multistability are considered for a number of light-induced effects in homogeneous and inhomogeneous liquid crystals. The special features of these effects in liquids crystals, associated with the field-induced structural phase transitions, are stressed and the concept of intrinsic (mirrorless) optical bistability is introduced. General nonlinear systems with optical bistability are considered. An analysis is made of instabilities and stochasticity manifested in experiments on light-induced reorientation of liquid crystals in the presence of fields of different origin, giving rise to oscillatory and chaotic processes in the case of self-modulation of the transmitted light.
The analysis of formation of chaotic quantum states for two (or four) orthogonally polarized modes in a tunnelly-coupled optical fiber (TCOF) has been carried out. A special attention is devoted both to the structure of arising polarization instabilities and to the possibility to control of such a quantum state by procedure of quantum nondemolition measurements. New effect of polarization switching is obtained. A new method of generating correlated fluctuations in optical field, based on Raman-Nath diffraction by a fine grating, is discussed. A nonclassical effect is predicted: a suppression of quantum fluctuations below the level of full coherence in the sum of difference photon numbers for the transmitted and scattered waves. The physics of this phenomenon involves a correlation of quantum fluctuations in the intensities of two modes that are coupled nonlinearly. This correlation is most effective in the limit of parametric interaction between the waves in the medium.