ULTIMATE-Subaru is the next-generation facility instrument program of the Subaru Telescope which will extend the existing Subaru’s wide-field survey capability to the near-infrared (NIR) wavelength. The ULTIMATE-Subaru instrument suite includes Ground-Layer Adaptive Optics (GLAO) and wide-field near-infrared instruments, aiming to provide ~ 0.2 arcsec image size at K band (2.2 micron) over 20 arcmin diameter field of view at the Cassegrain focus. The planned first-light instrument is a Wide-Field Imager (WFI), which covers a 14 x 14 square arcmin field of view in NIR wavelength. The instrument development is led by Subaru/NAOJ in collaboration with ANU, Tohoku University, ASIAA, and the University of Tokyo. The GLAO and WFI are currently in the final and the preliminary design phases, respectively, aiming to conduct the commissioning at the telescope in 2028. In this presentation, an overview of the ULTIMATE-SUBARU instruments, their current status, and future prospects will be presented.
The Asgard instrument suite proposed for the ESO’s Very Large Telescope Interferometer (VLTI) brings with it a new generation of instruments for spectroscopy and nulling. Asgard will enable investigations such as measurement of direct stellar masses for Galactic archaeology and direct detection of giant exoplanets to probe formation models using the first nulling interferometer in the southern hemisphere. We present the design and implementation of the Astralis-built Heimdallr, the beam combiner for fringe tracking and stellar interferometry in K band, as well as Solarstein, a novel implementation of a 4-beam telescope simulator for alignment and calibration. In this update, we verify that the Heimdallr design is sufficient to perform diffraction-limited beam combination. Furthermore, we demonstrate that Solarstein presents an interface comparable to the VLTI with co-phased, equal intensity beams, enabling alignment and calibration for all Asgard instruments. In doing so, we share techniques for aligning and implementing large instruments in bulk optics.
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