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When the beam from a semiconductor laser is focused through a lens or conducted through a fiber or similar element, it is important to have a clear understanding of the NFP (Near Field Pattern) of the semiconductor laser. The NFP of a semiconductor laser is extremely small, with a size on the order of 1 um, so precise measurement requires an expansion optics with a high rate of magnification. The illustration below shows a system capable of precise measurement of the semiconductor laser NFP, using an optics with an expansion magnification rate of 500 times (the A4859-01 NFP optics).
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