Abstract
Abstract A low refractive index fluoride glass based on barium, indium and gallium has been synthesized. By addition of aluminum, sodium and potassium fluorides to the base glass (BIGaZYbTZr), an index as low as 1.482 is obtained. The glass physical parameters are given and are found to be fully compatible with those of the base glass. A preform suitable for fiber drawing and exhibiting a theoretical numerical aperture of 0.26 is obtained. Optical losses are measured for the best fiber.
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