Phosphate glasses for optical fibers: Synthesis, characterization and mechanical properties

• Published in: Journal of non-crystalline solids 2013-02, Vol.362, p.147-151
• Main Authors: Mura, Emanuele, Lousteau, Joris, Milanese, Daniel, Abrate, Silvio, Sglavo, Vincenzo M.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fiber optics; Fundamental areas of phenomenology (including applications); Glasses (including metallic glasses); Materials science; Mechanical properties; Optical fibers; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Optics; Phosphate glass; Physics; Specific materials
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2012.11.029

Phosphate glasses (P2O5–Al2O3–Li2O–B2O3–BaO–La2O3) are studied in the present work for the fabrication of passive optical fiber for amplifier and laser applications. Innovative phosphate glasses with large stability toward crystallization (more than 200°C), low transition temperatures (477°C) and low thermal expansion coefficient (10×10−6°C−1) have been successfully produced. Thermo-mechanical and optical properties of the glasses are presented and discussed with respect to the glass composition. Specific care was used to the design and fabrication of two glasses with adequate thermo-mechanical properties to be suitable in the fiber drawing process. Due to the inner surface quality of the tubes manufactured by the rotational casting, the fiber presents very high quality interface between the core and the cladding. Mechanical characterization of the obtained fibers allowed the evaluation of tensile strengths of the order of 200–500MPa and a Weibull modulus of about 10. ► We present the study of phosphate glasses for the fabrication of a passive optical fiber for fiber lasers and amplifiers. ► The prepared phosphate glasses show large stability and low thermal expansion coefficient. ► We demonstrate a phosphate glass optical fiber for the first time using rotational casting for preform fabrication. ► Mechanical properties of the phosphate optical fiber are measured and reported.