Fiber structure, optical combiner, laser light source, and laser device

An optical combiner, comprising:

• a first fiber structure and a second fiber structure,
• wherein the first fiber structure and the second fiber structure each comprises:
• a covering part, the covering part having an optical fiber strand and a coating covering the optical fiber strand,
• a strand exposed part adjacent to the covering part, the strand exposed part including an exposed optical fiber strand, and
• a sealing part covering a boundary between the covering part and the strand exposed part, the sealing part including a fluororesin having a structure represented by formula (1):
• where R represents a divalent organic fluorine compound group, and n represents an integer of 1 or more,
• wherein in the first fiber structure, the covering part and the strand exposed part have a plurality of the optical fiber strands,
• wherein in the second fiber structure, the covering part and the strand exposed part have one optical fiber strand, and
• wherein an end face of the strand exposed part of the first fiber structure and an end face of the strand exposed part of the second fiber structure are fusion-spliced.