| FL FL, or Focal Length, is a critical parameter in laser engraving that refers to the distance between the focal point of the laser lens and the surface of the material being engraved. The focal length determines the size and shape of the laser spot on the material, influencing engraving precision, depth, and resolution. Engravers adjust the focal length to achieve optimal focus and engraving quality, ensuring sharp and well-defined marks across a range of material thicknesses and surface curvatures. |
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