| 摘要 |
PROBLEM TO BE SOLVED: To provide a measuring method of the far-field image of a laser, which can distinguish whether a laser beam is emitted in the vertical direction at an angle or the emitting position of the laser beam is shifted in the vertical direction, by measuring the space distribution of the intensity of beam of the laser beam at least two places or more, where the distant separately from the emitting position of the laser beam, and the device for measuring the far- field image of the laser. SOLUTION: Photodetectors are arranged at least two places or more of spots, where distance separate from the emitting position of a laser beam differ, the space distribution of the intensity of beam of the laser beam at the respective spots is measured and data on the measurements using the respective photodetectors are compared with each other, to distinguish whether the laser beam is emitted in the vertical or horizontal direction at an angle or whether the emitting position of the laser beam is shifted in the vertical or horizontal direction, whereby the far-field image of a semiconductor laser is measured with high accuracy and with high resolution.
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