| 摘要 |
PURPOSE:To measure the far field pattern (FFP) of a laser diode (LD) within a short time, by mounting and holding a plural number of laser diodes at a predetermined pitch and providing an LD mount and a plurality of light receiving parts, etc. CONSTITUTION:Corresponding to the arrangement pitch (a) of LDs 10(10-1-10-n) arranged on an LD mount 2 at an equal interval, second and third light receiving parts 12, 13 are provided to a moving stand 9 at the same pitch (a). The center position 0 of a first light receiving part 11 comes to a position integer times the pitch (a) from the shape of a rail. The light receiving part 11 detects the FFP characteristic of LD10 and the light receiving part 12 detects the current-light output (I-L) characteristic of LD10 and the light receiving part 13 detects the spectrum characteristic of LD. By this method, FFP of LD can be measured within a short time and measurement can be performed continuously and working efficiency can be enhanced. |
