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Journal of Experimental and Theoretical Physics

Formation of extreme (squeezed) states for laser pulses and beams in Bragg diffraction of light in a spatially periodic nonlinear medium

A. P. Alodzhants, Sergei M. Arakelyan, D. ter Haar

Published Mar 1, 1993• 0 citations
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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.
Light-induced change in the index of refraction of a Kerr medium is well known.1 Illumination with a spatially periodic light intensity leads to the formation of an index grating in the Kerr medium. We make a comparative study of the response time and power requirement for index grating formation in photorefractive and Kerr media. We examine the conditions in which the index grating in the Kerr medium will be spatially shifted from the light intensity that induces it. Two-beam coupling via Bragg diffraction from the nonlocal index grating is studied.2 The coupling constant is found to depend on the relaxation mechanism of the atoms in the Kerr media and the frequency detunings of the two beams from the line center.