cardinal_points

pygrin.pygrin.cardinal_points(n_0, pitch, length, offset=0)

Cardinal points of a grin lens relative to first surface.

Parameters:

• n_0 – index of refraction at center of grin lens [unitless]

• pitch – pitch or period of the lens [unitless]

• length – axial length of the lens [mm]

• offset – float (optional) origin relative to first lens surface

Returns:

float – location of the front focal point [mm] float: location of the first lens surface [mm] float: location of the first principal plane [mm] float: location of the second principal plane [mm] float: location of the second lens surface [mm] float: location of the back focal point [mm]