DocumentCode :
2519248
Title :
Requirements of deformable mirrors for adaptive optics
Author :
Dainty, Charis ; Dalimier, Eugenie
Author_Institution :
Appl. Opt. Group, Nat. Univ. of Ireland, Galway
fYear :
2005
fDate :
1-4 Aug. 2005
Firstpage :
183
Lastpage :
184
Abstract :
An adaptive optics (AO) system is one that is capable of correcting dynamic distortions and aberrations in an optical image or beam. There are three keys elements in a "conventional" AO system: the wavefront sensor, the correction device ("deformable mirror", DM), and a control system. The fundamental limits of AO are usually governed by the noise in the wavefront sensor, but the practical limit is often set by the correction device. Possible correction devices include: piezo-stack mirrors, bimorph mirrors, membrane mirrors, MEMS mirrors and refractive or reflective liquid crystal spatial light modulators. The temporal response required of deformable mirrors is strongly application dependent, varying from perhaps a few Hz in vision science to several KHz in strong turbulence. A parameter of special significance when thinking about MEMS mirrors is the physical size of the device. The DM is placed in a plane conjugate to the plane of the aberration (this might be the pupil plane in some cases), and the ratio of the diameter of the device to that of the correction area (e.g. pupil) determines the (de-)magnification M: however, angles in the pupil are then magnified by a factor M on the DM
Keywords :
aberrations; adaptive optics; micromechanical devices; micromirrors; optical images; spatial light modulators; wavefront sensors; MEMS mirrors; aberration; adaptive optics; bimorph mirrors; de-magnification factor; deformable mirror; dynamic distortion; membrane mirrors; optical images; piezo-stack mirror; pupil correction area; reflective liquid crystal; refractive liquid crystal; spatial light modulator; temporal response; wavefront sensor; Adaptive optics; Delta modulation; Liquid crystal devices; Micromechanical devices; Mirrors; Optical beams; Optical distortion; Optical noise; Optical refraction; Optical sensors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Optical MEMS and Their Applications Conference, 2005. IEEE/LEOS International Conference on
Conference_Location :
Oulu
Print_ISBN :
0-7803-9278-7
Type :
conf
DOI :
10.1109/OMEMS.2005.1540140
Filename :
1540140
Link To Document :
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