| 摘要 |
PURPOSE:To measure far field patterns (FFP) of plural LDs in a short time by providing an LD mount, a rail a photodetector, etc. CONSTITUTION:The LD mount 2 is replaceable from a fixed base 3 and LDs 10 are mounted in an array at equal intervals. Further, the rail 4 is provided on the base 3a and its center 0 corresponds to the LDs 10. The photodetector 5 is fitted to the rail 4 so that its photodetection surface 5a is in the center direction on the rail 4. The photodetector 5 is movable by a driving means 6 arcuately on the rail 4. The rail 4 is rotatably by specific angle through a rotating means 7. Namely, the rail 4 is rotated by, for example, 90 deg. above the surface of an LD 10 to measure the FFP of the LD 10 in a short time. Further, the means 7 is movable by a moving means 8 at pitch intervals of the LDs 10 on the mount 2, and the FFPs of the LDs 10 are measured continuously. |
