Abstract
When using ray tracing for optical system design, it is often the case that the
designer would like to implement simplified versions of one or more
compound lens groups. This could be the case during initial layout
when idealized versions of such compound lenses are needed or, perhaps
alternatively, to mimic a well-corrected commercially available lens
for which the prescription details are unavailable. One option is to
use a paraxial thin lens as a proxy for the actual lens group, but
doing so will yield a layout that is not consistent with Fermat’s
principle or the Abbe sine condition. For example, a paraxial lens
version of a compound microscope objective typically produces the
wrong numerical aperture for a given entrance pupil diameter, and vice
versa. A better option is to use a lens model that provides perfect
imaging for a specified paraxial magnification and obeys Fermat’s
principle. A variant of the model can yield a perfect Fourier
transform lens. In addition, it is desirable to implement an idealized
thick lens in which the principal planes are separated by a
user-specified distance. This paper presents such a model, referred to
as the Cardinal Lens, with implementation in Zemax OpticStudio via a
user-defined surface.
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering