Search academic texts

Information × Registration Number 0215U001101, 0112U002151 , R & D reports Title Formation, propagation and focusing of laser beams of terahertz radiation with an inhomogeneous polarization structure popup.stage_title Head Svitch V, Maslov V., Registration Date 19-01-2015 Organization Kharkov National University named after V.N. Karazin popup.description2 Object of research: physical processes of propagation and transformation of wave beams with inhomogeneous polarization in laser resonant terahertz systems and in free space The purpose of work: the creation of new and effective methods of formation of laser beams with non-uniform polarization in the terahertz range of the radiation, the study of the physical features of their propagation and focusing in free space. For exciting a single transverse mode with azimuthal polarization field for the first time in an optically pumped waveguide laser of terahertz range as an output mirror reflector is suggested which used as a dielectric layer coated with a metal ring grating. On the basis of calculations and experimental studies for the first time is show that the stable structure of the field for the waveguide modes in the terahertz range is observed on a nearer distance than determined by the Rayleigh criterion for the far-field diffraction. First theoretically based on the vector diffraction theory and experimentally using terahertz waveguide laser, the physical features of the effect of "moderate" and "severe" focusing beams of radiation in the form of waveguide modes with different spatial polarization field are established. The research results can be used to solve problems of transfer and the formation of wave beams with given space-energy characteristics of the radiation in the processing of materials, high-resolution metrology, mikroellipsometrii, spectroscopy and electron acceleration. Product Description popup.authors Гурін О. Дегтярьов А. Петриченко В. Рубан Т. Сенюта В. Топков О. Холодов В. popup.nrat_date 2020-04-02 Close