Search academic texts

Information × Registration Number 0203U008200, 0100U001363 , R & D reports Title Dislocation reaction in nonparaxial perturbed laser beams a focus popup.stage_title Head Volyar Alexandr Vladimirovich, Registration Date 14-05-2003 Organization National Taurida V. Vernadsky University popup.description2 The object of investigation is: a) Non-paraxial Laguerre-Gaussian beam, carrying transverse and longitudinal optical vortices in the far field. b) Singular beams within an axially symmetric inhomogeneous medius like an optical fiber subject to weak perturbation in the form of planar bending and geometric deformation of the transverse cross-section. The purpose of the work is experimental and theoretical investigation of dislocation reaction in a non-paraxial Gaussian beam under strong focusing with a purpose of finding out optimal conditions for creation of physical sensors. Experimental and theoretical investigation of birth and annihilation processes of special form of light field in low-mode fiber and in free space in the vicinity of focus. The method of investigation are: 1) the method of Whittaker potentials as the solutions of the scalar Helmgoltz equation with the subsequent construction of vector fields, 2) the method of Hermitian operators in the perturbation theory with degeneracy, 3)In experimental investigation the method of computer processing of information coming from a CCD-camera and the method of computer modeling on the basis of experimental data. The laser beams under focusing in the vicinity of the input fiber end undergoes the deformation of its field structure. The main types of field deformation of an optical vortex are found, arising while fiber excitation. Besides, the dispersion response of a bent fiber on the optical vortex field is found. The investigation of the beams in the free space was carried out on the basis of the exact solution of the Maxwell equation. The investigations of the propagation of singular beams in low-mode fiber were carried out on the basis of perturbation theory and constructing the Hamiltonian of the spin-orbit interaction. The results of the work extend the knowledge in the field of singular optics inhomogeneous media and therefore can be of use for the scientists working in the field of topological optical, in the field of light matter interaction, for the developers and users of fiber-optical communication lines, developers of functional units of optical electronic schemes, professors and lectures of the corresponding lecture courses for students, post-graduates specializing in optical and laser physics, radio physics. Besides, the obtained results can be used while creating interferometric temperature sensors, pressure sensors and vibration sensors. Product Description popup.authors popup.nrat_date 2020-04-02 Close