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Capillary optical fibers based on SiO2 –TiO2–P2O5 and TiO2–P2O5 internal coatings prepared by sol-gel method

  • Original Paper: Sol-gel and hybrid materials for optical, photonic and optoelectronic applications
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Abstract

This paper presents a novel approach to the preparation of capillary optical fibers using sol-gel method. It employs a novel modification of sol-gel techniques for the application of layers onto the inner walls of silica tubes. This modification was employed for the preparation of multilayer internal coatings of silica tubes which consist of alternating low-index layers of silica and high-index layers containing titania. Novel materials, namely silica-titania-phosphorus pentoxide and titania-phosphorus pentoxide prepared by the sol-gel method, were used in the high-index layers. Morphology and optical properties of single layers of all the materials applied on glass slides are presented as well as the optical properties of multilayer coatings inside silica tubes. The internally coated tubes were drawn into fibers with air and solid cores. Characteristics of the prepared fibers are also shown in the paper. Fibers with optical losses below 0.02 dB/cm have been prepared.

Graphical Abstract

Sols for the fabrication of SiO2-TiO2-P2O5 and TiO2-P2O5 thin films were prepared. The films were applied inside silica tubes alternating with SiO2 films by using a novel modified dip-coating technique. Capillary optical fibers with minimum optical losses below 0.02 dB/cm were drawn from the tubes.

Highlights

  • A novel approach for preparation of capillary optical fibers using sol-gel method.

  • New materials: silica-titania-phosphorus pentoxide and titania-phosphorus pentoxide.

  • Homogenous and low-loss single layers of these materials.

  • A novel modification of the application of thin layers on the inner walls of the silica tubes.

  • Capillary fibers with attenuations below 0.02 dB/cm were prepared.

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Acknowledgements

This research was financially supported by the Czech Science Foundation number 16-10019S.

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Authors and Affiliations

  1. Institute of Photonics and Electronics of the Czech Academy of Sciences, Chaberská 1014/57, 182 51, Prague, Czech Republic

    Ivo Barton, Vlastimil Matejec & Ondrej Podrazky

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  1. Ivo Barton
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  2. Vlastimil Matejec
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  3. Ondrej Podrazky
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Correspondence to Ivo Barton.

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Barton, I., Matejec, V. & Podrazky, O. Capillary optical fibers based on SiO2 –TiO2–P2O5 and TiO2–P2O5 internal coatings prepared by sol-gel method. J Sol-Gel Sci Technol 106, 847–859 (2023). https://doi.org/10.1007/s10971-023-06083-0

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  • DOI: https://doi.org/10.1007/s10971-023-06083-0

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