Commercial-Tolerance Superachromatic Near-IR Lens System

The figure depicts the optical layout and meridional-plane ray-trace diagram of a four-element superachromatic near-infrared (IR) lens system. The system features a 30-mm-diameter entrance pupil, a focal-length-to-diameter ratio (ƒ/ number) of 4, and a field of view with a half-cone-angle width of 0.25°.