An innovative integral field unit upgrade with 3D-printed micro-lenses for the RHEA at Subaru

Theodoros Anagnos, Pascal Maier, Philipp Hottinger, Christopher H. Betters, Tobias Feger, Sergio G. Leon-Saval, Itandehui Gris-Sanchez, Stephanos Yerolatsitis, Julien Lozi, Tim A. Birks, Sebastien Vievard, Nemanja Jovanovic, Adam D. Rains, Michael J. Ireland, Robert J. Harris, Blaise C. Kuo Tiong, Olivier Guyon, Barnaby Norris, Sebastiaan Y. Haffert, Matthias BlaicherYulin Xu, Moritz Straub, Jörg Uwe Pott, Oliver Sawodny, Philip L. Neureuther, David W. Coutts, Christian Schwab, Christian Koos, Andreas Quirrenbach

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding

3 Citations (SciVal)
43 Downloads (Pure)


In the new era of Extremely Large Telescopes (ELTs) currently under construction, challenging requirements drive spectrograph designs towards techniques that efficiently use a facility's light collection power. Operating in the single-mode (SM) regime, close to the diffraction limit, reduces the footprint of the instrument compared to a conventional high-resolving power spectrograph. The custom built injection fiber system with 3D-printed microlenses on top of it for the replicable high-resolution exoplanet and asteroseismology spectrograph (RHEA) at Subaru in combination with extreme adaptive optics of SCExAO, proved its high efficiency in a lab environment, manifesting up to ∼77% of the theoretical predicted performance.

Original languageEnglish
Title of host publicationAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV
EditorsRamon Navarro, Roland Geyl
ISBN (Electronic)9781510636897
Publication statusE-pub ahead of print - 13 Dec 2020
EventAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV 2020 - Virtual, Online, USA United States
Duration: 14 Dec 202022 Dec 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV 2020
Country/TerritoryUSA United States
CityVirtual, Online

Bibliographical note

Funding Information:
T.A. is a fellow of the International Max Planck Research School for Astronomy and Cosmic Physics at the University of Heidelberg (IMPRS-HD) and is supported by the Cotutelle International Macquarie University Research Excellence Scholarship. P.M., M.B., Y.X. and C.K. are supported by Bundesministerium für Bildung und Forschung (BMBF), joint project PRIMA (13N14630), the Helmholtz International Research School for Teratronics (HIRST), Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy via the Excellence Cluster 3D Matter Made to Order (EXC2082/1-390761711). R. J. H. and P.H. are supported by the Deutsche Forschungsgemeinschaft (DFG) through project 326946494, ’Novel Astronomical Instrumentation through photonic Reformatting’. T.B. & S.Y. are supported from the European Union’s Horizon 2020 grant 730890, and from the UK Science and Technology Facilities Council grant ST/N000544/1. S.Y.H. is supported by the NASA Hubble Fellowship grant #HST-HF2-51436.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. The development of SCExAO was supported by the JSPS (Grant-in-Aid for Research #23340051, #26220704 #23103002), the Astrobiology Center (ABC) of the National Institutes of Natural Sciences, Japan, the Mt Cuba Foundation and the directors contingency fund at Subaru Telescope, and the OptoFab node of the Australian National Fabrication Facility. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. This research made use of Astropy, a community-developed core Python package for Astronomy,23,24 Numpy25 and Matplotlib.26 Furthermore, this publication makes use of data generated at the Königstuhl Observatory Opto-mechatronics Laboratory (KOOL) which is run at the Max-Planck-Institute for Astronomy (MPIA, PI Jörg-Uwe Pott, in Heidelberg, Germany. KOOL is a joint project of the MPIA, the Landessternwarte Königstuhl (LSW, Univ. Heidelberg, Co-I Philipp Hottinger), and the Institute for System Dynamics (ISYS, Univ. Stuttgart, Co-I Prof. Oliver Sawodny). KOOL is partly supported by the German Federal Ministry of Education and Research (BMBF) via individual project grants.

Publisher Copyright:
© 2020 SPIE.

Copyright 2021 Elsevier B.V., All rights reserved.


  • astrophotonics
  • diffraction-limited spectrograph
  • fiber injection
  • integral field unit
  • micro-lenslets
  • optical fibers
  • radial velocity
  • SCExAO
  • spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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