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Achromatic Doublet Lenses

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Achromatic Doublet Lenses

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Visible Achromatic Doublet Lenses have significantly better optical performance than singlet lenses in visible imaging and laser beam manipulation applications. Our achromats have precise specifications and tolerances for uncompromising image quality. Computer optimized designs minimize aberrations, yielding smaller focused spot sizes. Our achromats can be substituted for our singlet lenses, allowing complex experiments to be verified with simple lenses and later improved with achromats.An achromat consists of a positive low-index crown glass lens element cemented to a negative high-index flint glass lens element. The elements are chosen so as to cancel chromatic aberration at two well separated wavelengths; usually in the blue and red region of the spectrum. Focal length is constant at those two wavelengths and focal length shifts are virtually eliminated across the visible wavelengths. All of our achromats are available with a single-layer MgF2 broadband antireflection coating to increase transmission throughout the visible spectrum. Our precision achromats are also available with a multi-layer anti-reflection coating (AR.14) for superior transmission efficiency in the broadband visible range.

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