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Telecommunications and Radio Engineering
SJR: 0.202 SNIP: 0.2 CiteScore™: 0.23

ISSN Druckformat: 0040-2508
ISSN Online: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v74.i7.50
pages 619-628

INFLUENCE OF THE REFRACTIVE INEX ANISOTROPY ON THE OPTICAL AND EMISSION CHARACTERISTICS OF LASER MATRICES BASED ON THE DYE-DOPED POLYURETHANES

S. V. Nikolaev
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
V. V. Pozhar
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
M. I. Dzyubenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine; V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine; Kharkiv National University of Radio Electronics, 14 Nauka Ave, Kharkiv 61166, Ukraine

ABSTRAKT

Recently, increased interest has been shown toward investigations oriented at the creation of efficient solid-state dye lasers. The majority of these investigations are focused on synthesizing solid active media on the basis of transparent polymers of various chemical natures. One class of the polymers that can be used in the laser technologies is represented by the polyurethane and its derivatives. The polyurethane media have been studied much poorly as compared with other kinds of the polymeric media. In particular, this concerns their optical properties. The study is aimed at analyzing the causes for occurrence of refractive index anisotropy in active polyurethane materials and investigating its influence on the optical and emission characteristics of laser matrices. It is ascertained that the optically anisotropic state of the medium is called forth by both the internal stresses of the polyurethane due to intermolecular interaction and thermal stresses induced by the powerful pumping. It is shown that the optical anisotropy results in the local birefringence effect in the media. The influence of the birefringence induced by the transverse pumping on the laser emission polarization is investigated. It is shown that under such conditions the active polyurethane elements generate a polarized emission even being excited by unpolarized light.