27 November 2017 Thick lens chromatic effective focal length variation versus bending
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Proceedings Volume 10590, International Optical Design Conference 2017; 105900C (2017) https://doi.org/10.1117/12.2292745
Event: International Optical Design Conference - IODC 2017, 2017, Denver, United States
Abstract
Longitudinal chromatic aberration (LCA) can limit the optical performance in refractive optical systems. Understanding a singlet’s chromatic change of effective focal leads to insights and methods to control LCA. Long established, first order theory, shows the chromatic change in focal length for a zero thickness lens is proportional to it's focal length divided by the lens V number or inverse dispersion. This work presents the derivation of an equation for a thick singlet's chromatic change in effective focal length as a function of center thickness, t, dispersion, V, index of refraction, n, and the Coddington shape factor, K. A plot of bending versus chromatic focal length variation is presented. Lens thickness does not influence chromatic variation of effective focal length for a convex plano or plano convex lens. A lens's center thickness'influence on chromatic focal length variation is more pronounced for lower indices of refraction.
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Scott Sparrold, "Thick lens chromatic effective focal length variation versus bending", Proc. SPIE 10590, International Optical Design Conference 2017, 105900C (27 November 2017); doi: 10.1117/12.2292745; https://doi.org/10.1117/12.2292745
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