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Understanding Optical Lens Geometries

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Understanding Optical Lens Geometries

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Optical lenses are the most important tools in optical design for controlling light. When optical designers talk about optical lenses, they are either referring to a single lens element or an assembly of lens elements (Figure 1). Examples of single elements are plano-convex (PCX) lenses, double-convex (DCX) lenses, aspheric lenses, etc; examples of assemblies of elements are telecentric imaging lenses, infinity-corrected objectives, beam expanders, etc. Each combination is comprised of a series of lens elements and each element has a specific lens geometry which controls light in its own way.

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