| 摘要 |
A laser unit includes a plurality of multi-mode semiconductor lasers configured to output laser lights in multi-mode, an optical multiplexer configured to multiplex and output the laser lights, a multi-mode optical fiber configured to connect the multi-mode semiconductor lasers to optical multiplexer and including a core portion, a cladding portion formed at an outer periphery thereof, and a coated portion coating an outer periphery thereof, a first bending portion formed to the optical fiber and bent with a predetermined bending length and at a predetermined first bending radius, a radiation portion formed outside the coated portion at the first bending portion and radiating heat of the optical fiber, and a second bending portion formed to the multi-mode optical fiber between the first bending portion and the optical multiplexer and bent at a predetermined second bending radius. Increase in a temperature at the second bending portion is restrained by radiation from the radiation portion. Thus, a highly reliable and miniaturized laser unit is provided. |
