Deployment of focal plane WFS technologies on 8-m telescopes: from the Subaru SPIDERS pathfinder, to the facility-class GPI 2.0 CAL2 system

SPIDERS/CAL2 collaborations

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

9 Scopus citations


Facility-class high-contrast exoplanet imaging systems are currently limited by non-common path quasi-static speckles. Due to these aberrations, the raw contrast saturates after a few seconds. Several active wavefront correction techniques have been developed to remove this noise, with limited success. The NRC Canada is funding two projects, the SPIDERS pathfinder at the Subaru telescope (ETA 2023), and the CAL2 upgrade of the Gemini Planet Imager-2 (ETA 2024), to deploy a modified self-coherent camera (based on FAST) to measure the focal plane electric field, and to apply wavefront corrections in a closed-loop down to 10s of ms in a narrow band. The CAL2 project will focus on developing a facility-class focal plane & Lyot-stop Low-order sensors using a CRED2 and a SAPHIRA-based camera, reaching up to a gain of 100x in contrast for bright stars. The SPIDERS pathfinder will have a similar configuration with the addition of an imaging Fourier transform spectrograph, allowing the acquisition of a 3.3” diagonal FOV to up to R-20,000 in the NIR to perform advanced spectral differential imaging at a high-spectral resolution to search and characterize exoplanets. These projects will serve as the foundation to develop similar systems for future ground-/space-based telescopes, and be an important step toward the development of instruments to search for life signatures in the atmosphere of exoplanets.

Original languageEnglish (US)
Title of host publicationAdaptive Optics Systems VIII
EditorsLaura Schreiber, Dirk Schmidt, Elise Vernet
ISBN (Electronic)9781510653511
StatePublished - 2022
EventAdaptive Optics Systems VIII 2022 - Montreal, Canada
Duration: Jul 17 2022Jul 22 2022

Publication series

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


ConferenceAdaptive Optics Systems VIII 2022


  • Adaptive Optics
  • exoplanets
  • focal plane WFS
  • high-contrast
  • imaging
  • self-coherent camera

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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