Visible Achromatic Doublets
Most visible achromatic doublets use the helium “D” line (587.6nm, yellow), hydrogen “F” (486.1nm, blue/green), and “C” (656.3nm, red) lines to represent the visible spectrum and define the Abbe V number of a material. These cemented doublets are computer optimized to provide excellent performance in the visible region. When chromatic aberration must be controlled, a doublet is typically employed. Frequently, a diffraction-limited spot may be achieved when using a monochromatic source such as a laser.
Positive Visible Achromats: Infinite Conjugate Ratio
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UV Fused Silica Plano-Convex Lenses

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