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about
About
The mandatory parameters table allows to enter the necessary input datas for each surface of the system (radius of curvature : R, refraction index of the medium after the surface : n, constringence of the medium after the surface : V, distance to the next surface : d, diameter : D). It includes also optional parameters (constr., type, V parax., aperture and tilt/decenter).
Constr.
It enables to constrain the parameters of a surface to those of a reference surface. If the check box of this column is activated for a surface, the reference surface and the constraint factors corresponding to each parameter must be entered in the constraints table.
Type
It defines the shape or the behaviour of the surface. Complementary parameters related to the surface (geometrical parameters or focal lengths) must be entered in the non spherical surfaces table for any type of surface other than "spherical". Among other types, "thin lens" is a flat surface behaving as a paraxial thin lens and "thin lensXY" is a flat surface behaving as a paraxial thin lens with independant focal lengths in the XZ and YZ planes.
V parax.
This cell is only activated if the selected type of surface is "thin lens" or "thin lensXY". It defines then the constringence of the paraxial lens.
Aperture
This cell allows to declare eventual extra obturations to be applied to the surface (other than the aperture defined by the surface diameter D). Extra obturation parameters must be entered in the links and obturations table for any aperture type other than "none".
Tilt-decenter
It allows to select how rotations and/or decentrations (if any) are processed on a surface by choosing among several options. Once an option is selected, the eventual values of rotations and/or decentrations must be entered in the tilts and decenters table.
For more details concerning the mandatory parameters table, see the related tutorial.