Open loop liquid crystal adaptive optics systems: progresses and results

2015 ◽  
Author(s):  
Zhao-liang Cao ◽  
Quan-quan Mu ◽  
Huan-yu Xu ◽  
Pei-guang Zhang ◽  
Li-shuang Yao ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Adaptive Optics ◽  
Open Loop

Open loop adaptive optics testbed on 2.16meter telescope with liquid crystal corrector

2012 ◽  
Vol 285 (6) ◽  
pp. 896-899 ◽  
Author(s):  
Quanquan Mu ◽  
Zhaoliang Cao ◽  
Lifa Hu ◽  
Yonggang Liu ◽  
Zenghui Peng ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Adaptive Optics ◽  
Open Loop

Progress of liquid crystal adaptive optics for applications in ground-based telescopes

2020 ◽  
Vol 494 (3) ◽  
pp. 3536-3540
Author(s):  
Xingyun Zhang ◽  
Zhaoliang Cao ◽  
Quanquan Mu ◽  
Dayu Li ◽  
Zenghui Peng ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Liquid Crystal ◽  
Adaptive Optics ◽  
Low Cost ◽  
Response Speed ◽  
Open Loop ◽  
Loop Control ◽  
Compact Size ◽  
Control Scheme ◽  
Resolution Imaging

ABSTRACT Liquid crystal (LC) adaptive optics systems (AOS) can potentially be used in ground-based large aperture telescopes, because of their high spatial resolution, low cost and compact size. However, their disadvantages, such as low energy efficiency and slow response speed, still hinder their application. In this paper, we demonstrate solutions to these problems. With newly synthesized fast nematic LC material and using an overdriving technique, the response time of a LC wavefront corrector was reduced to 0.75 ms. Under an open-loop control scheme, a novel optical system was designed to improve the energy efficiency of LC AOS. With those problems resolved, a LC AOS was built for a 1.23-m telescope. This system has a disturbance rejection bandwidth of 80 Hz, and could fully use the energy of 400–900 nm wavebands. Observation results showed that the diffraction limit resolution imaging of the telescope could be obtained after correction, which indicates that the LC AOS is ready to be used in ground-based telescopes for visible waveband imaging.

Liquid Crystal Adaptive Optics System for Retinal Imaging Operated on Open-Loop and Double-Pulse Mode

2012 ◽  
Vol 32 (1) ◽  
pp. 0111002
Author(s):  
孔宁宁 Kong Ningning ◽  
李大禹 Li Dayu ◽  
夏明亮 Xia Mingliang ◽  
齐岳 Qi Yue ◽  
宣丽 Xuan Li
Keyword(s):  
Liquid Crystal ◽  
Adaptive Optics ◽  
Retinal Imaging ◽  
Pulse Mode ◽  
Open Loop ◽  
Double Pulse ◽  
Adaptive Optics System

scholarly journals Optimal energy-splitting method for an open-loop liquid crystal adaptive optics system

2012 ◽  
Vol 20 (17) ◽  
pp. 19331 ◽  
Author(s):  
Zhaoliang Cao ◽  
Quanquan Mu ◽  
Lifa Hu ◽  
Yonggang Liu ◽  
Zenghui Peng ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Adaptive Optics ◽  
Splitting Method ◽  
Open Loop ◽  
Energy Splitting ◽  
Optimal Energy ◽  
Adaptive Optics System

scholarly journals Improved bandwidth of open loop liquid crystal adaptive optics systems with a proportional-derivative controller

2019 ◽  
Vol 27 (8) ◽  
pp. 11651 ◽  
Author(s):  
Xingyun Zhang ◽  
Zhaoliang Cao ◽  
Chengliang Yang ◽  
Zenghui Peng ◽  
Quanquan Mu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Adaptive Optics ◽  
Open Loop ◽  
Proportional Derivative Controller

Open loop liquid crystal adaptive optics systems: progresses and results

2016 ◽  
Vol 45 (4) ◽  
pp. 0402002
Author(s):  
曹召良 Cao Zhaoliang ◽  
穆全全 Mu Quanquan ◽  
徐焕宇 Xu Huanyu ◽  
张佩光 Zhang Peiguang ◽  
姚丽双 Yao Lishuang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Adaptive Optics ◽  
Open Loop

Performance simulation of an adaptive optics system with liquid crystal corrector under closed-loop and open-loop control

2010 ◽  
Vol 283 (10) ◽  
pp. 2017-2019 ◽  
Author(s):  
Quanquan Mu ◽  
Zhaoliang Cao ◽  
Zenghui Peng ◽  
Yonggang Liu ◽  
Lifa Hu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Adaptive Optics ◽  
Closed Loop ◽  
Open Loop ◽  
Open Loop Control ◽  
Performance Simulation ◽  
Loop Control ◽  
Adaptive Optics System

High Resolution Open-Loop Adaptive Optics System for Retinal Imaging Based on Liquid Crystal Spatial Light Modulator

2012 ◽  
Vol 32 (10) ◽  
pp. 1011003
Author(s):  
齐岳 Qi Yue ◽  
孔宁宁 Kong Ningning ◽  
李大禹 Li Dayu ◽  
夏明亮 Xia Mingliang ◽  
宣丽 Xuan Li
Keyword(s):  
Liquid Crystal ◽  
High Resolution ◽  
Adaptive Optics ◽  
Spatial Light Modulator ◽  
Retinal Imaging ◽  
Open Loop ◽  
Light Modulator ◽  
Adaptive Optics System

scholarly journals Modal prediction for open-loop liquid-crystal adaptive optics systems

2012 ◽  
Vol 61 (12) ◽  
pp. 129501
Author(s):  
Liu Chao ◽  
Hu Li-Fa ◽  
Mu Quan-Quan ◽  
Cao Zhao-Liang ◽  
Hu Hong-Bin ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Adaptive Optics ◽  
Open Loop
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