Optical Design Considerations for a Millimeter-Wave Focal Plane Array

This paper focuses on the optics design for a 3 x 3 millimeter-wave focal plane array for the Delingha 13.7-m telescope. Three optical schemes, such as that with relay optics consisting of focusing mirrors or lenses, or that without relay optics, have been evaluated using ZEMAX, with a comparison to that from GRASP9. The conclusion drawn from the two software tools agree well with each other.