Patent ID: 9523818
Filing Date: 2016-12-20
CPC Classification: B23K,G02B

Claim Text:
1. An optical fiber comprising: an incident end on which light is incident; an emitting end from which the light is emitted; and an aperture provided in a core located at or near the emitting end, wherein the aperture is formed by irradiating the core with an ultrashort pulsed laser beam having pulse widths of 10 wherein the aperture is formed by a light scattering region that is separated from the emitting end along an axis line of the core by a certain distance, and wherein at least part of the light passing through a region other than the light scattering region of the aperture reaches the emitting end by being reflected at an interface between the core and a clad of the optical fiber on the emitting end side of the aperture.