| Near Field The near field refers to the region close to a radiation source or an object where the electromagnetic field patterns are complex and vary significantly with distance. In optics and electromagnetic theory, the near field is distinguished from the far field, which is the region where the field patterns become more uniform and predictable. In laser systems, the near field is the area immediately surrounding the laser aperture or output surface, where the laser beam undergoes significant spatial and intensity variations. Understanding the near field is essential for optimizing laser beam quality, focusing, and controlling beam characteristics in various laser applications, including laser cutting, welding, and microscopy. |
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