| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a multi optical fiber which can uniform a polarization state of laser beams emitted from a plurality of optical fibers within an allowable range. SOLUTION: In the multi optical fiber comprised of a plurality of optical fibers, a laser light from a laser light source is guided to a predetermined position to form a plurality of secondary light sources to the predetermined position. The optical fiber has a predetermined length or smaller. The predetermined length is 40 cm or smaller, and preferably 15 cm or smaller.</p> |
