Dynamic self-diffraction effects in liquid crystals

<title>3D structures and laser-induced dynamic self-organization processes in an organic medium with a long-range interaction</title>

“…(6) Transmitting the expressions (6) into the et of equations (5) and after some mathematical manipulations one sets the value (we assume G >>G ): As it is seen from eq. The essential part is, that the NLC with initially homogeneous orientation was irradiated by a single-mode (TEM) laser beam without any spatially periodic structure.…”

Light-induced modulated structures, intrinsic optical multistability and instabilities for the competitive wave interactions in liquid crystals

“…-The geometric optics approximation has been used for the theory of nonlinear interaction of the laser radiation with a nonhomogeneous anisotropic medium. The standard procedure for a NLC is described in [4,27]. The initial equation is Fig.…”

“…Both of these cases are a realization in nonlinear optics of distributed feedback systems [8]. For NLC different spatial modulated structures arise in the medium [4]. In CLC the spatial scale of periodicity is changed.…”

“…These dynamic self-diffraction effects due to the anisotropy of the medium because of two waves of different polarizations, travelling through the medium, create laser-induced gratings along the thickness (d) of the sample (z-direction). An energy interchange (over time) occurs between two polarization components (1) in this laser-distorted nonhomogeneous anisotropic medium with spatial modulation of the optical axis n (z ), which is determined by a non-adiabatic deformation [4]. Experiments have been carried out in [7,[9][10][11].…”

“…(£11, £1. are the dielectric components parallel and perpendicular to the director) and K are the optical anisotropy and elastic parameter of the NLC, consequently [4]. For CLC, the periodic energy redistribution between the waves leads to the so-called pendulum beatings (over the space) [1].…”