Hello,

Ellipsoidal (or elliptical) surfaces can be created in sequential or non-sequential modes using a Standard Surface with the appropriate radius and conic constant, the values of which can be determined by optimization.

For non-sequential mode, you can use either a Standard Surface or a Standard Lens. You could also create the desired lens in sequential mode and convert it to non-sequential using the built-in tool.

In the attached non-sequential file, the reflector is a Standard Surface. A Source Two Angle fills the reflector and the reflected rays strike a detector. The source and detector are placed at the intended foci of the reflector. The Optimization Wizard is used to generate a merit function that targets the RMS spot size to zero. The radius and conic constant of the reflector are variables. (Ignore Errors is set on the NSTR operand.)