Testing an off-axis parabola with a CGH and a spherical mirror as null lens

Chunyu Zhao, Rene Zehnder, James H. Burge, Hubert M. Martin

Research output: Contribution to journalConference articlepeer-review

19 Scopus citations


Steward Observatory Mirror Lab is currently polishing an off-axis parabola which will be the primary mirror of the New Solar Telescope. To test this mirror, we built a test equipment to combine a spherical mirror and a Computer Generated Hologram (CGH) as null lens. The spherical mirror is tilted to compensate much of the astigmatism and some coma. And the CGH compensates rest of aberrations. The combination of a spherical mirror and a CGH makes the test system compact. The technology developed here will be used to test the Giant Magellan Telescope's primary mirror segment - a five times larger off-axis parabola.

Original languageEnglish (US)
Article number586911
Pages (from-to)1-12
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2005
EventOptical Manufacturing and Testing VI - San DIego, CA, United States
Duration: Jul 31 2005Aug 1 2005

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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