Abstract
Sapphire fiber is a promising candidate for harsh environment sensing due to its high melting point, compact structure, and corrosion resistance, where the fiber with a smaller diameter and a larger length-diameter ratio is being widely demanded. In this work, high quality sapphire crystal fibers with minimum diameter of 25 μm and maximum length of 24.5 m were successfully prepared by laser-heated pedestal growth technique, which is the dimension record for crystal fibers that ever reported. Sapphire fibers exhibit anisotropic growth behaviors and the c-oriented sapphire fibers were demonstrated to have higher tensile strength compared to a-oriented sapphire fibers, illustrating superior mechanical properties. Moreover, various essential properties such as flexibility, surface roughness, and crystallinity have also been systematically investigated.
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