IRANTI: a compact flexible configuration infrared échelle spectrograph integrating emerging technologies for precise radial velocity measurements

Blaise C. Kuo Tiong*, Christian Schwab, Tobias Feger, Theodoros Anagnos, Jacob Pember, Surangkhana Rukdee, Leonardo Vanzi, David W. Coutts

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

Abstract

Small diameter single-mode fiber (SMF) allows for the design of compact spectrographs that operate at the diffraction limit. The small instrument scale, in turn, allows cost-effective configuration flexibility to use the instrument as a testbed for infrared SMF spectrograph technologies. The same base instrument could be coupled to different adaptive optics (AO) and non-AO SMF feeds. We present the build for such a spectrograph, Iranti, which works in the near-infrared (NIR) range and incorporates novel techniques. Our implementation of this instrument has sufficient cross dispersion to allow testing of a range of input fiber links, including multiple fibers or multi-core fibers (MCFs); the camera optics and detector can also be swapped out easily for different wavelength ranges. The base system uses a white pupil design that relays a slow beam between the collimator, an R6 echelle grating with 13.33 lines/mm and a volume phase holographic grating (VPH) as a cross disperser. In Iranti, we also address mechanical and thermal considerations to improve stability in the instrument. We configure the instrument for ranges in 800 to 1300nm and characterize system efficiency and stability.
Original languageEnglish
Title of host publicationProceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII
EditorsChristopher J. Evans, Julia J. Bryant, Kentaro Motohara
Place of PublicationBellingham, Washington
PublisherSPIE
Pages1-10
Number of pages10
ISBN (Electronic)9781510636828
ISBN (Print)9781510636811
DOIs
Publication statusPublished - 2020
EventGround-based and Airborne Instrumentation for Astronomy VIII - Virtual, United States
Duration: 14 Dec 202022 Dec 2020

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume11447
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceGround-based and Airborne Instrumentation for Astronomy VIII
CountryUnited States
Period14/12/2022/12/20

Keywords

  • exoplanet
  • radial velocity
  • multicore fibers
  • infrared
  • InGaAs
  • spectrograph
  • single mode fibers
  • Astronomy

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