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23 September 2015 Chromatic variation of aberration: the role of induced aberrations and raytrace direction
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Abstract
The design and optimization process of an optical system contains several first order steps. The definition of the appropriate lens type and the fixation of the raytrace direction are some of them. The latter can be understood as a hidden assumption rather than an aware design step. This is usually followed by the determination of the paraxial lens layout calculated for the primary wavelength. It is obvious, that for this primary wavelength the paraxial calculations are independent of raytrace direction. Today, most of the lens designs are specified not to work only for one wavelength, but in a certain wavelength range. Considering such rays of other wavelengths, one can observe that depending on the direction there will already occur differences in the first order chromatic aberrations and additionally in the chromatic variation of the third-order aberrations. The reason for this effect are induced aberrations emerging from one surface to the following surfaces by perturbed ray heights and ray angles. It can be shown, that the total amount of surface-resolved first order chromatic aberrations and the chromatic variation of the five primary aberrations can be split into an intrinsic part and an induced part. The intrinsic part is independent of the raytrace direction whereas the induced part is not.
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A. Berner, T. Nobis, D. Shafer, and H. Gross "Chromatic variation of aberration: the role of induced aberrations and raytrace direction", Proc. SPIE 9626, Optical Systems Design 2015: Optical Design and Engineering VI, 96260N (23 September 2015); https://doi.org/10.1117/12.2191347
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