| 摘要 |
PURPOSE:To prevent the generation of Raman scattered rays by forming the inner side of a metallic member which is stuck to the inner side of a tubular covering member and has optically high reflectivity as a hollow part. CONSTITUTION:This fiber is formed of the tubular covering member 1, the aluminum foil 2 which is stuck to the inner side of the member 1 and has the high reflectivity of light, and the hollow part 3 which is provided to the inner side of the aluminum foil 2. The light progressing in the direction different from the axial center of the fiber for light transmission in incident light A is reflected toward the inner side by the aluminum foil 2 having the high reflectivity at the point (a) or (b) on the surface of the aluminum foil 2. The incident light A is thereby transmitted mostly toward the other end and is emitted as exit light B. The generation of the Raman scattered rays is thus obviated. |
