| 摘要 |
PURPOSE:To suppress the rays of light which are reflected back to a semiconductor laser by fixing two positions between an optical fiber core and a fiber holder and, the end part between an optical fiber element wire and the holder. CONSTITUTION:A lens 2 is arranged at the distance of >=1mm from the semiconductor laser and consists of three divided parts; semiconductor laser part, lens and isolator part, and optical fiber part. An adjustment perpendicular to the optical axis of the lens isolator part and adjustments parallel and perpendicular to the optical axis of the optical fiber are so made that projection light from the laser 1 is passed through the lens 2, magneto-optic crystal 5, and a polarizer 7 and is made incident on the optical fiber from the end part of the fiber element wire 8 at a maximum, and then a fixing part 10' is fixed. The fiber element wire 8 and fiber holder 9 are fixed by the fixing part 8, the position of the optical fiber is adjusted, and the laser part and isolator part, and the isolator part and holder 9 are fixed respectively. Consequently, the quantity of reflected light is suppressed at a specified value or below. |
