University of Hawaii adaptive optics system: III. Wavefront curvature sensor
Abstract
A wavefront curvature sensor suitable for adaptive optics has been developed at the University of Hawaii. This paper describes a curvature sensor that can rapidly scan between extra focus images with a vibrating membrane acting as a variable curvature active optical element at 7 - 20 khz. This optical system is coupled to an array detector, of a special design, that is computer optimized to match the response of a bimorph adaptive mirror. Recent laboratory results will show wavefront comparisons with other more established technique for curvature sensing and closed loop performance test with a monolithic piezo deformable mirror with 21 actuators. Results will also be given showing tip/tilt corrections achieved on Procyon with this wavefront sensor at the Canada France Hawaii 3.5 m Telescope on Mauna Kea during April 1991.
- Publication:
-
Active and Adaptive Optical Systems
- Pub Date:
- December 1991
- DOI:
- 10.1117/12.48814
- Bibcode:
- 1991SPIE.1542..262G
- Keywords:
-
- Adaptive Optics;
- Curvature;
- Mirrors;
- Wave Front Deformation;
- Feedback Control;
- Membranes;
- Instrumentation and Photography