| 摘要 |
PURPOSE:To increase the power of a light source to a higher powder and to effectively receive the laser beam from the light source in an optical fiber so that said beam is transmitted by forming the light incident end face of a core to a flat shape or forming the light incident end face larger than the other end face so as to correspond the same to the light source having the flat shape. CONSTITUTION:The light source 4 is increased in the power by increasing the width of the light emission part of a semiconductor laser element to flatten said part and to widen the light emission area. The laser beam 7 emitted from the flat light source 4 is focused by a condenser lens 6 and is made incident on the light incident end face 10 of the optical fiber 8 the sectional shape of the core 9 of which is formed flat. The light incident end face 10 of the optical fiber 8 the sectional shape of the core 9 of which is formed flat is provided diametrically opposite to the flat light source 4 in such a manner and, therefore, the coupling efficiency of the light source 4 and the optical fiber 8 is increased as high as >=90%. The emission of the high-power laser beam 7 from the light exit end 11 of the optical fiber 8 is thus possible. |
