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Powell prisms

Powell prisms are optical scribing prisms that allow a laser beam to pass through and be optimally scribed into a straight line with uniform optical density, good stability, and good straightness. Powell prism scribing is superior to the scribing mode of a cylindrical lens, eliminating the center hot spot and fading edge distribution of a Gaussian beam. A Gaussian laser beam passing through an ordinary cylindrical lens produces an unevenly distributed straight line, whereas the top of a Powell prism is a complex two-dimensional aspherical surface, which produces a large amount of spherical aberration when the laser passes through, redistributing the light path to reduce light in the center area and increase light at the edges to form a uniform straight line, which is suitable for a variety of biomedical, automotive assembly, food processing and other machine vision applications.

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