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Proceedings Paper

Adaptive optics using curvature sensing
Author(s): Fred F. Forbes; Nicolas A. Roddier
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Paper Abstract

An adaptive optics scheme is proposed which uses curvature sensing, a bimorph PZT deformable mirror, a simple extrafocal image splitter and a sensitive, low noise Solid State Photomultiplier array detector. With curvature sensing, the incoming wavefront is described in terms of curvature which can be directly mapped point-by-point to a driven deformable segmented mirror. While other methods such as Hartmann, require time and cost consuming computations, the curvature mirror can be driven in near real-time taking full advantage of the 11 kHz bandwidth of the bimorph mirror. The SSPM is easily configured to any array pattern without loss of performance. The arrangement is particularly suited to large telescopes in the 8 m class for which the wavefront curvature sensor can provide additional useful information to correct for collimation and structural variations as well as the rapid seeing correction.

Paper Details

Date Published: 1 December 1991
PDF: 8 pages
Proc. SPIE 1542, Active and Adaptive Optical Systems, (1 December 1991); doi: 10.1117/12.48801
Show Author Affiliations
Fred F. Forbes, National Optical Astronomy Observatories (United States)
Nicolas A. Roddier, National Optical Astronomy Observatories (United States)

Published in SPIE Proceedings Vol. 1542:
Active and Adaptive Optical Systems
Mark A. Ealey, Editor(s)

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