A cylindrical lens is an optical element with a cylindrical surface, belonging to the category of aspheric lenses. Its cross-section can exhibit various shapes, including plano-convex, plano-concave, biconvex, or biconcave.
This lens alters the light path through one-dimensional magnification, causing the plane image to distort. Parallel beams are focused into straight lines, while the image quality of non-parallel beams varies with the angle of incidence.
Compared to traditional spherical lenses, aspheric cylindrical lenses eliminate spherical aberration, forming a focal line rather than a focal point on the focusing axis, significantly reducing the beam size of monochromatic light sources. Applications include laser systems, barcode scanning, spectroscopy, and medical technology.
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