As performance demands continue to grow, many optical fibre systems are operating at progressively higher power levels. However, Brillouin scattering restricts continued power scaling in narrow-linewidth systems. Optical fibres with engineered Brillouin properties that are manufactured using industry-accepted methods would be of great practical benefit. Here, we show all-glass optical fibres derived from sapphire that have alumina concentrations of up to ∼55 mol%, which is considerably greater than conventionally possible and enables a series of useful properties. Specifically, a Brillouin gain coefficient of 3.1 × 10−13 m W−1, a value nearly 100 times lower than commercial fibre, was measured for a fibre with an average alumina concentration of 54 mol%. Furthermore, a fibre with ∼38 mol% alumina was found to be athermal, with a Brillouin frequency that was insensitive to changes in temperature. Such optical fibres may be beneficial in realizing enhanced telecommunication, sensor and high-energy laser systems.
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The authors thank C. Dunn for technical support and A. Yablon for the refractive index profile measurements.
The authors declare no competing financial interests.
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Dragic, P., Hawkins, T., Foy, P. et al. Sapphire-derived all-glass optical fibres. Nature Photon 6, 627–633 (2012). https://doi.org/10.1038/nphoton.2012.182
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