Prof. E. Yousef Profile

Prof. E. Yousef

at King Khalid Univ

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Proceedings Article | 2 March 2020 Paper

Laser-operated optical anisotropy of novel rare-earth-doped TeO2-P2O5-ZnO-MxOy-PbF2 glasses

Katarzyna Ozga, Iwan Kityk, Manuela Reben, El Sayed Yousef, Marian Kubliha, Ondrej Bosak

Proceedings Volume 11274, 112741X (2020) https://doi.org/10.1117/12.2543555

KEYWORDS: Glasses, Birefringence, Oxides, Laser optics, Ions, Zinc oxide, Anisotropy, Laser applications, Transition metals, Iron

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Novel glasses based on TeO₂-P₂O₅-ZnO-M_xO_y-PbF₂ doped by rare earths for laser operated optical anisotropy are proposed. We have discovered an increase of birefringence within coherent laser densities within the 200...500 MW/cm² power densities up to 5×10^-5. After it is enhanced more slowly and is saturated after 800 MW/cm². The glasses have been treated by two bicolour laser beams which propagated under the incident angles varying within the 22…25 degree for 45 degree light polarization. The photoinducing beam have been formed by the 10 ns Nd:YAG laser with 10 Hz frequency repetition. The set of polarizers, lenses and mirrors have been used for formation of the photo inducing laser beams with the desired parameters. The all investigated glasses in temperature interval within the 20°C up to 300°C show the same mechanism of electric charge transport. We have discovered that the glasses possess a high thermostability with the small exception for the first two cycles of heating-cooling and for all the glasses for the third and higher cycling. Addition of rare earth elements has not a huge influence on their stability. The maximal changes are observed for TiO₂ containing compounds, the middle one – for ZnO and the lowest for WO₃. The laser operation has been performed by simultaneous treatment by two bicolor coherent beams. The relaxation processes are equal to about several minutes. Here principal role play polarizabilities of the Ti ions which are maximal and the relatively higher atomic radiuses for Zn and W. The obtained glasses may be promising for laser stimulated fibers during transmission of optical information.

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