Manufacture and use of a Shack-Hartmann sensor with a multifaceted prism for simultaneous sensing of multiple wavefronts

Nicole Putnam, Miguel Snyder, Thomas Stalcup, Roger Angel

Research output: Contribution to journalConference article

4 Scopus citations


A new requirement for astronomical adaptive optics is the simultaneous measurement of wavefronts of multiple natural or laser guide stars. We have devised a new implementation of the Shack-Hartmann method to image multiple spot patterns on a single imaging array. An image of the telescope pupil is formed on a multifaceted prism with rings of subapertures. All beacons in the field are then imaged by a camera lens to form the same spot pattern repeated over the detector format. The facets are fly-cut in polycarbonate, tangent to a convex surface. In order to minimize scattering and aid manufacturing, the prism angles are exaggerated, and an index-matching fluid is used to reduce the refracted angles by a factor of 15. Results from lab and telescope tests are presented.

Original languageEnglish (US)
Article number200
Pages (from-to)1138-1145
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue numberPART 3
StatePublished - Dec 1 2004
EventAdvancements in Adaptive Optics - Glasgow, United Kingdom
Duration: Jun 21 2004Jun 25 2004



  • Adaptive optics
  • Index matching
  • Laser guide star
  • MCAO
  • Prism array
  • Tomography
  • Wavefront sensor

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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