ADAPTIVE OPTICS WITH SEGMENTED MIRROR OR DEFORMABLE MIRROR

1980 ◽  
Vol 41 (C9) ◽  
pp. C9-269-C9-273
Author(s):  
J. P. Gaffard ◽  
C. Davila ◽  
J. C. De Miscault ◽  
G. Roger
Keyword(s):  
Adaptive Optics ◽  
Deformable Mirror ◽  
Segmented Mirror

A New Design of Large Stroke Micro-Deformable Mirror Actuated by Electrostatic Repulsive Force

2008 ◽  
Author(s):  
Fangrong Hu ◽  
Jun Yao ◽  
Chuankai Qiu ◽  
Dajia Wang
Keyword(s):  
Electric Field ◽  
Resonant Frequency ◽  
Adaptive Optics ◽  
Bottom Electrode ◽  
Sacrificial Layer ◽  
Electrostatic Force ◽  
Repulsive Force ◽  
Deformable Mirror ◽  
Optical Aberrations ◽  
Out Of Plane

In this paper, a MEMS mirror actuated by an electrostatic repulsive force has been proposed and analyzed. The mirror consists of four U-shape springs, a fixed bottom electrode and a movable top electrode, there are many comb fingers on the edges of both electrodes. When the voltage is applied to the top and bottom electrodes, an asymmetric electric field is generated to the top movable fingers and springs, thus a net electrostatic force is produced to move the top plate out of plane. This designed micro-mirror is different from conventional MDM based on electrostatic-attractive-force, which is restricted by one-third thickness of the sacrificial layer for the pull-in phenomenon. The characteristic of this MDM has been analyzed, the result shows that the resonant frequency of the first mode is 8 kHz, and the stroke reaches 10μm at 200V, a MDM with large strokes can be realized for the application of adaptive optics in optical aberrations correction.

Extreme Adaptive Optics

2018 ◽  
Vol 56 (1) ◽  
pp. 315-355 ◽  
Author(s):  
Olivier Guyon
Keyword(s):  
Adaptive Optics ◽  
Thermal Emission ◽  
Contrast Ratio ◽  
Angular Separation ◽  
Circumstellar Disks ◽  
Spectroscopic Characterization ◽  
Central Star ◽  
High Contrast ◽  
Direct Imaging ◽  
Segmented Mirror

Over the last two decades, several thousand exoplanets have been identified, and their study has become a high scientific priority. Direct imaging of nearby exoplanets and the circumstellar disks in which they form and evolve is challenging due to the high contrast ratio and small angular separation relative to the central star. Exoplanets are typically within 1 arcsec of, and between 4 and 10 orders of magnitude fainter than, the stars they orbit. To meet these challenges, ground-based telescopes must be equipped with extreme adaptive optics (ExAO) systems optimized to acquire high-contrast images of the immediate surrounding of nearby bright stars. Current ExAO systems have the sensitivity to image thermal emission from young massive planets in near-IR, while future systems deployed on Giant Segmented Mirror Telescopes will image starlight reflected by lower-mass rocky planets. Thanks to rapid progress in optical coronagraphy, wavefront control, and data analysis techniques, direct imaging and spectroscopic characterization of habitable exoplanets will be within reach of the next generation of large ground-based telescopes.

Adaptive Optics System Based on Combinational Deformable Mirror for Improving Wavefront Spatial Correction Capability

2009 ◽  
Vol 29 (3) ◽  
pp. 587-593
Author(s):  
杨华峰 Yang Huafeng ◽  
饶长辉 Rao Changhui ◽  
张雨东 Zhang Yudong ◽  
姜文汉 Jiang Wenhan
Keyword(s):  
Adaptive Optics ◽  
Deformable Mirror ◽  
Adaptive Optics System

Constraint Study on Deformable Mirror in Close-Loop Adaptive Optics System

2015 ◽  
Vol 35 (12) ◽  
pp. 1201002
Author(s):  
陈善球 Chen Shanqiu ◽  
刘文劲 Liu Wenjin ◽  
董理治 Dong Lizhi ◽  
王帅 Wang Shuai ◽  
杨平 Yang Ping ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Deformable Mirror ◽  
Adaptive Optics System
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