Patent ID: 7903695
Filing Date: 2011-03-08
Classification: H01S

Abstract:
1. An optical fiber laser that has an optical fiber comprising a core to which a rare earth element is added and a clad disposed around the core, and also has an excitation light source for emitting excitation light incident on a side of the optical fiber; wherein the clad has corrugated parts in a corrugated shape, a diameter of an outer circumference of the corrugated parts continuously increasing and decreasing in a cyclic manner along a longitudinal direction of the optical fiber; wherein the optical fiber is wound in a spiral form with a plurality of turns and is bundled in such a way that adjacent sides of the corrugated parts of the clad are brought into contact with one another, and that the excitation light beams are incident across the turns of the optical fiber; and wherein the optical fiber is wound in such a way that: tops of convex parts in the corrugated parts of adjacent turned optical fibers do not match each other; bottoms of concave parts in the corrugated parts of adjacent turned optical fibers do not match each other; and the bottoms of the concave part and the top of the convex part in the corrugated parts of adjacent turned optical fibers do not match each other.