Design of liquid crystal-deformable mirror adaptive optical system data acquisition and process software

Yu-kun, 王玉坤 Wang; Zhaoliang, 曹召良 Cao; Da-yu, 李大禹 Li; Huan-yu, 徐焕宇 Xu; Li, 宣丽 Xuan

doi:10.3788/ope.20182606.1507

Cited by 3 publications

(3 citation statements)

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“…We first calculate the wavefront generated by the LC without decoupling. The control matrix C for the LC can be calculated using Formulas ( 13)- (15). The LC response wavefront can be expressed as follows:…”

Section: Decoupling Of the Lc-dm Ao Systemmentioning

confidence: 99%

“…So far, the coupling term is obtained with Formula (18), and the coefficient C coup can be calculated with Formula (15). The third step is to subtract the coupling term to reset the control signal sent to the LC, thus the control signal sent to the LC after decoupling is as follows:…”

Section: Decoupling Of the Lc-dm Ao Systemmentioning

confidence: 99%

“…Irrespective of whether a device is a dual DM system or an LC-DM system, the aberrations to be corrected are measured by a wavefront sensor (WFS). The distribution and decoupling methods of aberrations must be studied to prevent the correction loss caused by the opposite aberrations of each corrector, and the AO correction can be rendered unstable [15]. To achieve simultaneous working of dual correctors, researchers have proposed many decoupling control methods, including the two-step [16], Zernike limited term [17], control signal reset [18], Fourier mode [19], Lagrangian damped least square [20], and the wavelet mode decoupling [21] method.…”

Section: Introductionmentioning

confidence: 99%

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Eigenmode Wavefront Decoupling Algorithm for LC–DM Adaptive Optics Systems

Wang

Jin

2022

Applied Sciences

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To realize the decoupling control of the dual corrector of liquid crystal (LC)–deformable mirror (DM) adaptive optics (AO) systems and prevent the loss of correction ability induced by coupling aberrations, a wavefront decoupling method based on DM eigenmodes was proposed. The coupling relationship of two correctors was studied, and the distribution of aberrations corrected using the DM and LC was investigated. First, a DM eigenmode matrix was derived according to the DM influence function. Then, aberrations were decomposed according to the Strehl ratio, and the projection of the LC response matrix on the DM eigenmode matrix, that is, the coupling term, was derived. Before using the LC corrector, the coupling item was eliminated for the decoupling of the two correctors, and the decoupling effect was verified through simulations. Finally, a 2 m telescope LC–DM AO system was developed to validate the proposed method. The simulation and experimental results showed that the root mean square of the DM-corrected residual after 55 eigenmodes’ correction was 0.09 μm. After decoupling correction, the resolution of the 700–1700 nm wide band improved from 1.1 to 1 times the diffraction limit, which is 1.2 times better than that obtained using the traditional Zernike mode correction.

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Section: Decoupling Of the Lc-dm Ao Systemmentioning

confidence: 99%

Section: Decoupling Of the Lc-dm Ao Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Eigenmode Wavefront Decoupling Algorithm for LC–DM Adaptive Optics Systems

Wang

Jin

2022

Applied Sciences

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A Global Decoupling Control Algorithm for LC-DM Adaptive Optics System

Wang

Zhang

et al. 2021

IEEE Access

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The liquid crystal (LC) and deformable mirror (DM) cascaded adaptive optics (AO) system can be used to effectively extend the imaging waveband of a large aperture telescope from the infrared to the visible waveband. However, to maintain the effectiveness and stability of the LC-DM AO system, the issues of synchronization and cross-coupling must be resolved. This study proposed a global decoupling control algorithm to simultaneously control the two correctors with high precision. The global decoupling control matrix has been constructed using an eigenmode orthogonal basis and a constraint matrix. The eigenmode orthogonal basis has been derived from the response matrix of the DM and is used for selectively distributing the large stroke low-order aberration to the DM and the remaining aberration to the LC. The constraint matrix has been derived from the projection of the LC response matrix onto the DM eigenmode orthogonal basis, which is used for restraining the LC generating the cross-coupling shape with the DM. The control vectors for both correctors have been calculated simultaneously using the global decoupling control matrix. Numerical simulation indicates that this algorithm exhibits good performance in correcting the different spatial frequency aberrations simultaneously and suppressing the cross-coupling between the dual correctors. Compared to the typical Zernike decomposition algorithm, this algorithm can make full use of the compensation ability of LC-DM. An experiment was conducted on the LC-DM AO system for a 2 m telescope. The experimental results demonstrate that this algorithm is practical for the LC-DM AO system. The cross-coupling between the dual correctors can be restrained well for static and dynamic aberrations simultaneously.

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Automatic Acquisition Method of Geotechnical Engineering Survey Data based on Artificial Intelligence

Mudan

2020

2020 IEEE International Conference on Industrial Application of Artificial Intelligence (IAAI)

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Design of liquid crystal-deformable mirror adaptive optical system data acquisition and process software

Cited by 3 publications

References 0 publications

Eigenmode Wavefront Decoupling Algorithm for LC–DM Adaptive Optics Systems

Eigenmode Wavefront Decoupling Algorithm for LC–DM Adaptive Optics Systems

A Global Decoupling Control Algorithm for LC-DM Adaptive Optics System

Automatic Acquisition Method of Geotechnical Engineering Survey Data based on Artificial Intelligence

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