Method of laser modification of an optical fibre
AssigneeOxford University Innovation Limited
InventorsJulian Fells, Martin Booth, Patrick Salter
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Abstract
Method of laser modifying an optical fibre to form a modified region at a target location within the fibre, comprising positioning at least a portion of an optical fibre in a laser system for modification by a laser, applying a correction to an active optical element of the laser system to modify wavefront properties of the laser to counteract an effect of aberration on laser focus, and laser modifying the optical fibre at the target location using the laser with the corrected wavefront properties to produce the modified region.
Claims18
A single-mode sapphire optical fibre comprising an array of laser modified regions, the material of each laser modified region having undergone a negative refractive index change by the laser modification.
A sapphire optical fibre comprising a plurality of laser-written modifications which are solid, and surround an unmodified core of the fibre to thereby form a waveguide.
A sapphire optical fibre comprising a plurality of laser-modified regions surrounding a core of the fibre and being thereby arranged to provide a waveguide in the fibre, the optical fibre being configured by the laser-modified regions to increases losses for predetermined propagation modes therein and/or reduce the number of modes that can propagate in the optical fibre.
Dependencies are inferred from the claim text.