Magnetic fluid deformable mirror based wavefront sensorless adaptive optics systems

2018 ◽  
Author(s):  
Yuanyuan Wang ◽  
Zhizheng Wu ◽  
Zhu Zhang ◽  
Dziki Mbemba
Keyword(s):  
Adaptive Optics ◽  
Magnetic Fluid ◽  
Deformable Mirror

scholarly journals Large Aberration Correction by Magnetic Fluid Deformable Mirror with Model-Based Wavefront Sensorless Control Algorithm

2019 ◽  
Vol 20 (15) ◽  
pp. 3697
Author(s):  
Xiang Wei ◽  
Yuanyuan Wang ◽  
Zhan Cao ◽  
Dziki Mbemba ◽  
Azhar Iqbal ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Magnetic Fluid ◽  
Control Algorithm ◽  
Imaging System ◽  
Colloidal Suspension ◽  
Deformable Mirror ◽  
Model Based Control ◽  
Model Based ◽  
Proposed Model ◽  
Ferromagnetic Particles

Magnetic fluid is a stable colloidal suspension of nano-sized, single-domain ferri/ferromagnetic particles dispersed in a liquid carrier. The liquid can be magnetized by the ferromagnetic particles aligned with the external magnetic field, which can be used as a wavefront corrector to correct the large aberrations up to more than 100 µm in adaptive optics (AO) systems. Since the measuring range of the wavefront sensor is normally small, the application of the magnetic fluid deformable mirror (MFDM) is limited with the WFS based AO system. In this paper, based on the MFDM model and the relationship between the second moment (SM) of the aberration gradients and the far-field intensity distribution, a model-based wavefront sensorless (WFSless) control algorithm is proposed for the MFDM. The correction performance of MFDM using the model-based control algorithm is evaluated in a WFSless AO system setup with a prototype MFDM, where a laser beam with unknown aberrations is supposed to produce a focused spot on the CCD. Experimental results show that the MFDM can be used to effectively compensate for unknown aberrations in the imaging system with the proposed model-based control algorithm.

scholarly journals Beam Shaping by a Magnetic Fluid Deformable Mirror With Curved Trajectory for Optical Tweezer System

IEEE Access ◽  
2021 ◽  
Vol 9 ◽  
pp. 121645-121653
Author(s):  
Xiang Wei ◽  
Yongjun Yang ◽  
Dziki Mbemba ◽  
Feng Li ◽  
Zhizheng Wu ◽  
...  
Keyword(s):  
Magnetic Fluid ◽  
Optical Tweezer ◽  
Beam Shaping ◽  
Deformable 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.

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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