Sensitivity to differential piston and to adaptive optics errors with the Large Binocular Telescope Interferometer

Fabien Patru, Simone Esposito, Alfio Puglisi, Armando Riccardi, Enrico Pinna, Carmelo Arcidiacono, John Hill, Philip M Hinz

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


On-sky adaptive optics wavefront screens have been used and random optical path fluctuations-differential pistons-have been included in numerical simulations for the Large Binocular Telescope Interferometer. We characterize the Point Spread Function (PSF) and the Optical Transfer Function (OTF) by computing respectively the interferometric Strehl and the visibility criteria. We study the contribution of the wavefront disturbance induced by each adaptive optics system and by the optical path difference between the arms of the LBTI. To provide an image of quality (Strehl above 70%) suitable with standard science cases, the requirements for a LBTI mode in the visible wavelengths (750nm) must be at least an adaptive optics wavefront RMS fluctuations below λ/1840nm (Strehl above 90%) provided by each adaptive optics system, and a differential piston RMS fluctuations below λ/8100nm in the overall LBTI system. The adaptive optics wavefront errors-mainly the differential tip-Tilt-appear to be more critical than the differential piston.

Original languageEnglish (US)
Title of host publicationOptical and Infrared Interferometry and Imaging V
ISBN (Electronic)9781510601932
StatePublished - 2016
Externally publishedYes
EventOptical and Infrared Interferometry and Imaging V - Edinburgh, United Kingdom
Duration: Jun 27 2016Jul 1 2016


OtherOptical and Infrared Interferometry and Imaging V
Country/TerritoryUnited Kingdom


  • Adaptive optics
  • Differential piston
  • Interferometry
  • Large Binocular Telescope Interferometer
  • Optical path difference
  • Optical transfert function
  • Point spread function
  • Wavefront aberrations

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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