Design of NEID, an extreme precision Doppler spectrograph for WIYN

C. Schwab, A. Rakich, Q. Gong, S. Mahadevan, S. P. Halverson, A. Roy, R. C. Terrien, P. M. Robertson, F. R. Hearty, E. I. Levi, A. J. Monson, J. T. Wright, M. W. McElwain, C. F. Bender, C. H. Blake, J. Stürmer, Y. V. Gurevich, A. Chakraborty, L. W. Ramsey

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

31 Citations (Scopus)


We have developed an optical design for a high resolution spectrograph in response to NASA's call for an extreme precision Doppler spectrometer (EPDS) for the WIYN telescope. Our instrument covers a wavelength range of 380 to 930 nm using a single detector and with a resolution of 100,000. To deliver the most stable spectrum, we avoid the use of an image slicer, in favor of a large (195 mm diameter) beam footprint on a 1x2 mosaic R4 Echelle grating. The optical design is based on a classic white pupil layout, with a single parabolic mirror that is used as the main and transfer collimator. Cross dispersion is provided by a single large PBM2Y glass prism. The refractive camera consists of only four rotationally symmetric lenses made from i-Line glasses, yet delivers very high image quality over the full spectral bandpass. We present the optical design of the main spectrograph bench and discuss the design trade-offs and expected performance.

Original languageEnglish
Title of host publicationGround-Based and Airborne Instrumentation for Astronomy VI
EditorsChristopher J. Evans, Luc Simard, Hideki Takami
Place of PublicationWashington, US
Number of pages6
ISBN (Electronic)9781510601956
Publication statusPublished - 2016
EventGround-Based and Airborne Instrumentation for Astronomy VI - Edinburgh, United Kingdom
Duration: 26 Jun 201630 Jun 2016

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X


OtherGround-Based and Airborne Instrumentation for Astronomy VI
CountryUnited Kingdom


  • Doppler technique
  • Echelle spectrograph
  • Exoplanets
  • Fibre-fed spectrograph
  • Radial velocities

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