Progress toward science results with the ACES spectrograph

Robert O. Reynolds, Michael Lloyd-Hart, Michael P. Lesser, Matthew A. Kenworthy, Jian Ge

Research output: Contribution to journalConference articlepeer-review

8 Scopus citations


The use of spectrographs with telescopes having high order adaptive optics (AO) systems offers the possibility of achieving near diffraction-limited spectral resolution on ground-based telescopes, as well as important advantages for instrument design. The small stellar image diameters obtained with adaptively corrected systems allow high resolution without a large loss of light at the spectrograph entrance slit, as well as greater spectral coverage per exposure. The adaptively corrected echelle spectrograph (ACES), designed at Steward Observatory for a spectral resolution R ≈ 200,000, couples the telescope pupil to the instrument with a 10 μm diameter near single-mode optical fiber. Initial observations at the 2.5m telescope on Mt. Wilson validated the concept of achieving high spectral resolution with an adaptively corrected telescope and fiber coupled spectrograph. However the transmission of multiple modes in the fiber lead to a wavelength-dependent variation in illumination that made flat fielding impossible. In this paper we describe instrument design improvements, the installation and testing of a new CCD detector, and testing aimed at understanding and eliminating the fiber-related transmission problems to permit science quality imaging.

Original languageEnglish (US)
Pages (from-to)1705-1714
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue number3
StatePublished - 2002
EventInstrument Design for Optical/Infrared Ground-based Telescopes - Waikoloa, HI, United States
Duration: Aug 25 2002Aug 28 2002


  • Adaptive optics
  • CCD
  • Echelle
  • Modal noise
  • Optical fiber
  • Single mode fiber
  • Spectrograph

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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