Developing the field selector system for the SHARP multi-IFU: optomechanical design and first prototype validation

This paper presents the innovative field selector system (FSS) developed for VESPER, the multi-Integral field unit of the SHARP near-infrared spectrograph. The proposed system employs an array of movable light-collection probes (field selectors) that travel along parallel, vertically offset planes to avoid mechanical interference and vignetting. The true novelty, to our best knowledge, lies in its optomechanical synchronization: as each probe translates by Δ y to select a target, a set of folding mirrors shifts by Δ y/2. This maintains a constant optical path length, allowing multiple independently moving probes to share a single focal plane and form a continuous image on it, which is easy to slice by the slicer. A dedicated optical test setup was developed to characterize the positioning stability and repeatability of the probe motion. The measured mechanical errors were converted into equivalent optical tilts and incorporated into the SHARP optical model to assess their impact on instrument performance. The experimental results identified the dominant sources of positioning error and provided valuable insight into the relationship between mechanical tolerances and optical performance. The study also highlights several design improvements capable of significantly reducing probe tilting and enhancing system stability. The results demonstrate the viability of the proposed concept and indicate that, with the identified improvements, the system represents an excellent field-selection solution for SHARP and other multi-integral-field-unit (mIFU) spectrographs.