Model-based wavefront sensorless control with magnetic fluid deformable mirror for large aberration corrections

2019 ◽  
Author(s):  
Xiang Wei ◽  
Yuanyuan Wang ◽  
Zhan Cao ◽  
Dziki Mbemba ◽  
Zhu Zhang ◽  
...  
Keyword(s):  
Magnetic Fluid ◽  
Sensorless Control ◽  
Deformable Mirror ◽  
Model Based ◽  
Aberration Corrections

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

Wavefront Sensorless Aberration Correction With Magnetic Fluid Deformable Mirror for Laser Focus Control in Optical Tweezer System

2021 ◽  
Vol 57 (1) ◽  
pp. 1-6
Author(s):  
Zhizheng Wu ◽  
Tianyu Zhang ◽  
Dziki Mbemba ◽  
Yuanyuan Wang ◽  
Xiang Wei ◽  
...  
Keyword(s):  
Magnetic Fluid ◽  
Optical Tweezer ◽  
Deformable Mirror ◽  
Aberration Correction ◽  
Laser Focus
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