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Proceedings Paper

Imaging issues for interferometry with CGH null correctors
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Paper Abstract

Aspheric surfaces, such as telescope mirrors, are commonly measured using interferometry with computer generated hologram (CGH) null correctors. The interferometers can be made with high precision and low noise, and CGHs can control wavefront errors to accuracy approaching 1 nm for difficult aspheric surfaces. However, such optical systems are typically poorly suited for high performance imaging. The aspheric surface must be viewed through a CGH that was intentionally designed to introduce many hundreds of waves of aberration. The imaging aberrations create difficulties for the measurements by coupling both geometric and diffraction effects into the measurement. These issues are explored here, and we show how the use of larger holograms can mitigate these effects.

Paper Details

Date Published: 19 July 2010
PDF: 12 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77390T (19 July 2010); doi: 10.1117/12.857810
Show Author Affiliations
James H. Burge, College of Optical Sciences, The Univ. of Arizona (United States)
Chunyu Zhao, College of Optical Sciences, The Univ. of Arizona (United States)
Ping Zhou, College of Optical Sciences, The Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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