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Why use a aspheric lenses ?

Aspheric lenses are designed to focus or collimate light without introducing spherical aberration into the transmitted wavefront. For monochromatic sources, spherical aberration is often what prevents a single spherical lens from achieving diffraction limited performance when focusing or collimating light. Thus, an aspheric lens is often the best single element solution for many applications including collimating the output of a fiber or laser diode, coupling light into a fiber, spatial filtering, or imaging light onto a detector.
Yutai Optics offers CNC precision-polished large-diameter aspherical lenses, with and without anti-reflection (AR) coatings. These lenses are available in larger sizes, provide better surface quality, and maintain the M squared values of the input beam better than their molded aspheric lens counterparts. The surface of an aspheric lens is designed to eliminate spherical aberration, providing diffraction-limited spot sizes. They are often employed to collimate light exiting a fiber or laser diode. We also offer acylindrical lenses, which provides the advantages of aspheres in one-dimensional focusing applications.
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