06 Sep 2021 The near-axial aberrations such as spherical aberration, coma aberration, and chromatic aberration are well corrected by computer optimization design. When used to focus the collimation, the surface of a convex lens or small radius of curvature is usually oriented toward the collimation light. When used for imaging, a convex lens must be oriented toward the side with the object or image at a longer distance. In the design, the different values of dispersion and lens shape were optimized to achieve the minimum chromatic aberration at the three wavelengths of blue (486.1nm), green (546.1nm), and red (656.3nm). Thus, such a lens can be used throughout the visible light region.
An achromatic lens is used to minimize or eliminate chromatic aberration, and its achromatic design also helps to minimize spherical aberration, which is much smaller than a single lens. When used in an infinite conjugate state, the spherical difference is minimal. The achromatic lens is suitable for fluorescence microscopy, image relay, detection, or spectrum applications. The manufacture of achromatic lenses involves gluing together two or more components. Achromatic lenses can produce smaller points of light than monocolor lenses.
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