Gallium-lanthanum-sulphide glasses: extrusion of fiber optic preforms and relevant physical properties

Angela B. Seddon; David Furniss; D. J. Sims

doi:10.1117/12.372800

10 December 1999 Gallium-lanthanum-sulphide glasses: extrusion of fiber optic preforms and relevant physical properties

Angela B. Seddon, David Furniss, D. J. Sims

Proceedings Volume 3849, Infrared Optical Fibers and Their Applications; (1999) https://doi.org/10.1117/12.372800
Event: Photonics East '99, 1999, Boston, MA, United States

Abstract

We report on some physical properties of candidate Ga-La-S compositions pertinent both to being able to extrude fiberoptic preforms, and pull fiber, as well as giving the potential for low optical loss and waveguiding for the finished fiber. For Ga-La-S glasses of Ga/La equals 70/30 and 65/35, each at two oxide contents; 0.65 wt%[O] and 2.95 wt%[O]: viscosity/temperature relations between ca. 10⁸ Pas to 10^11.3 Pas have been measured by indentation viscometry using a thermo-mechanical analyzer, and refractive indices at 632.8 nm and 3390 nm have been measured by the minimum deviation method using small glass prisms. In addition, characteristic temperatures and absorption spectra are reported. On the basis of the measured properties we have selected a core/clad pair and prepared a rod-in-tube preform by one-step extrusion using high viscosity in the region of 10⁸ Pas. Rod with good surface finish, and close to 2.5 mm diameter with a variation of less than 0.01 mm over lengths of 300 mm has been extruded. The extrusion of rods of small diameter is being investigated to enable monomode rod-in-tube preforms to be produced without the need for a stretching operation with the inherent risk of crystallization. Tube of 12 mm OD and 2.5 mm ID proved a close fit to the extruded rod.

Citation Download Citation

Angela B. Seddon, David Furniss, and D. J. Sims "Gallium-lanthanum-sulphide glasses: extrusion of fiber optic preforms and relevant physical properties", Proc. SPIE 3849, Infrared Optical Fibers and Their Applications, (10 December 1999); https://doi.org/10.1117/12.372800

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