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【adoptive optics】
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Imaging Systems
Piston sensing via a dispersed fringe sensor with a merit-function-based active scanning algorithm at low light levels
Download:944次
Yongfeng Zhang
1,2,3
Hao Xian
1,2,*
Author Affiliations
Abstract
1
Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China
2
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
Dispersed fringe sensors are a promising approach for sensing the large-scale physical step between adjacent segments with acceptable accuracy. However, the nature of dispersion in a dispersed fringe sensor leads to the ideal dispersed fringe pattern becoming vulnerable to noise, particularly at low light levels. A reliable merit-function-based algorithm with an active actuation is introduced here. The feasibility of our algorithm is numerically demonstrated, and Monte Carlo experiments for different signal-to-noise ratios are conducted to assess its robustness. The results show that the method is valid even when the signal-to-noise ratio is as low as 1.
110.6770
Telescopes
220.1140
Alignment
220.1080
Active or
adoptive optics
130.6010
Sensors
PDF全文
Full Text
Chinese Optics Letters
2019, 17(12): 121101
Imaging systems
Telescope alignment based on the sharpness function of under-sampled images
Download:881次
Min Li
1,2,3
Xin Liu
2
Ang Zhang
1,2,*
Hao Xian
1,2,**
Author Affiliations
Abstract
1
Key Laboratory of Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China
2
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
The precise alignment of a high-performance telescope is a key factor to ensure the imaging quality. However, for telescopes with a wide field of view, the images are sometimes under-sampled. To study the effects of under-sampled images on the precision of telescope alignment, numerical simulations are implemented with the stochastic parallel gradient descent algorithm. The results show that the alignment program can converge stably and quickly. However, with the reduction of the full width at half-maximum of images, the relative residual errors increase from 9.5% to 19.5%, and the wavefront errors raise from 0.0972
λ
to 0.1074
λ
, indicating that the accuracy of the alignment decreases.
110.6770
Telescopes
120.4820
Optical systems
220.1140
Alignment
220.1080
Active or
adoptive optics
PDF全文
Full Text
Chinese Optics Letters
2019, 17(6): 061101
Lasers and laser optics
1.57 times diffraction-limit high-energy laser based on a Nd:YAG slab amplifier and an adaptive optics system
Cover Paper
Download:1558次
Licheng Sun
1
Tinghao Liu
1
Xing Fu
1
Yading Guo
2
[ ... ]
Lei Huang
1,*
Author Affiliations
Abstract
1
Center for Photonics and Electronics, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
2
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
In this Letter, a 116-actuator deformable mirror (DM) was used to correct the wavefront distortion in a 10.7 J, 10 Hz neodymium-doped yttrium aluminum garnet (Nd:YAG) slab amplifier. By applying a pump-light homogenizer to transform the 3 × 1 near-field beam array into an integrated beam, the beam quality was greatly improved from 5.54 times diffraction limit (TDL) to 1.57 TDL after being corrected by the DM. To the best of our knowledge, this is the first investigation on beam quality control of an arrayed near-field beam in high-energy diode-pumped solid-state lasers.
140.3280
Laser amplifiers
140.3480
Lasers, diode-pumped
220.1080
Active or
adoptive optics
220.1000
Aberration compensation
PDF全文
Full Text
Chinese Optics Letters
2019, 17(5): 051403
Vision, Color, and Visual Optics
Objective visual performance evaluation with visual evoked potential measurements based on an adaptive optics system
Download:822次
Yanrong Yang
1,2,3
Junlei Zhao
1,2
Haoxin Zhao
1,2
Fei Xiao
1,2
[ ... ]
Yun Dai
1,2,*
Author Affiliations
Abstract
1
Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China
2
Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
4
School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China
An objective visual performance evaluation with visual evoked potential (VEP) measurements was first integrated into an adaptive optics (AO) system. The optical and neural limits to vision can be bypassed through this system. Visual performance can be measured electrophysiologically with VEP, which reflects the objective function from the retina to the primary visual cortex. The VEP measurements without and with AO correction were preliminarily carried out using this system, demonstrating the great potential of this system in the objective visual performance evaluation. The new system will provide the necessary technique and equipment support for the further study of human visual function.
330.4460
Ophthalmic optics and devices
220.1080
Active or
adoptive optics
330.4300
Vision system - noninvasive assessment
330.1070
Vision - acuity
PDF全文
Full Text
Chinese Optics Letters
2018, 16(5): 053301
Advances in Metasurfaces
Deflection angle switching with a metasurface based on phase-change nanorods [Invited]
Download:840次
Chulsoo Choi
1
Sun-Je Kim
1
Jeong-Geun Yun
1
Jangwoon Sung
1
[ ... ]
Byoungho Lee
1,*
Author Affiliations
Abstract
1
School of Electrical and Computer Engineering and Inter-University Semiconductor Research Center, Seoul National University, Gwanak-Gu Gwanakro 1, Seoul 08826, South Korea
2
School of Electronics Engineering, Kyungpook National University, Daegu 41566, South Korea
We propose the active metasurface using phase-change material
Ge
2
Sb
2
Te
5
(GST), which has two distinct phases so called amorphous and crystalline phases, for an ultrathin light path switching device. By arranging multiple anisotropic GST nanorods, the gradient metasurface, which has opposite directions of phase gradients at the two distinct phases of GST, is demonstrated theoretically and numerically. As a result, in the case of normal incidence of circularly polarized light at the wavelength of 1650 nm, the cross-polarized light deflects to
55.6
°
at the amorphous phase and
+
55.6
°
at the crystalline phase with the signal-to-noise ratio above 10 dB.
160.3918
Metamaterials
220.1080
Active or
adoptive optics
PDF全文
Full Text
Chinese Optics Letters
2018, 16(5): 050009
Imaging Systems
Bimorph deformable mirror based adaptive optics scanning laser ophthalmoscope for retina imaging
in vivo
Yuanyuan Wang
1,2,3,4
Yi He
1,2,*
Ling Wei
1,2
Xiqi Li
1,2
[ ... ]
Yudong Zhang
1,2
Author Affiliations
Abstract
1
The Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China
2
University of Chinese Academy of Sciences, Beijing 100039, China
3
School of Ophthalmology & Optometry and Eye Hospital, Wenzhou 325035, China
4
Wenzhou Medical University, Wenzhou 325035, China
A bimorph deformable mirror (DM) with a large stroke of more than 30 μm using 35 actuators is presented and characterized for an adaptive optics (AO) confocal scanning laser ophthalmoscope application. Facilitated with a Shack–Hartmann wavefront sensor, the bimorph DM-based AO operates closed-loop AO corrections for human eyes and reduces wavefront aberrations in most eyes to below 0.1 μm rms. Results from living eyes, including one exhibiting
~
5
D
of myopia and
~
2
D
of astigmatism along with notable high-order aberrations, reveal a practical efficient aberration correction and demonstrate a great benefit for retina imaging, including improving resolution, increasing brightness, and enhancing the contrast of images.
110.0110
Imaging systems
110.1080
Active or
adoptive optics
170.1790
Confocal microscopy
PDF全文
Full Text
Chinese Optics Letters
2017, 15(12): 121102
Atmospheric Optics and Oceanic Optics
Zonal decoupling algorithm for dual deformable mirror adaptive optics system
Download:1035次
Wenjin Liu
1,2,*
Lizhi Dong
1,2
Ping Yang
1,2
Bing Xu
1,2
Author Affiliations
Abstract
1
Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China
2
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
A zonal decoupling algorithm used to control a dual deformable mirror (DM) is proposed. One of the two DMs is characterized with a large stroke (woofer), while the other one is characterized by a high spatial frequency (tweeter). A numerical model is used to compare the zonal decoupling algorithm with some traditional zonal decoupling algorithms. The simulation results indicate that the algorithm presented in this Letter improves the performance in suppressing the coupling error. An experimental system is built to prove the effectiveness of this algorithm. The experiments demonstrate that the phase aberrations could be effectively compensated and that the coupling error could also be suppressed.
010.1080
Active or
adoptive optics
220.1080
Active or
adoptive optics
000.3860
Mathematical methods in physics
PDF全文
Full Text
Chinese Optics Letters
2016, 14(2): 020101
Lasers and Laser Optics
Laser beam cleanup using improved model-based wavefront sensorless adaptive optics
Download:926次
Bing Dong
*
Rui Wang
Author Affiliations
Abstract
School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China
An improved model-based wavefront sensorless adaptive optics algorithm is proposed for laser beam cleanup. Deformable mirror (DM) eigenmodes are used to replace traditional Lukosz modes in order to avoid DM fitting errors. The traditional method is based on a sophisticated calibration process and solving linear equations. In our method, coefficients of DM eigenmodes are estimated by adding bidirectional modal biases into the system and then solving parabolic equations. The calibration process is omitted in our method, which makes it more feasible. From simulation and experimental results, the corrective accuracy of the improved method is higher than the traditional one.
140.3300
Laser beam shaping
220.1080
Active or
adoptive optics
PDF全文
Full Text
Chinese Optics Letters
2016, 14(3): 031406
Lasers and Laser Optics
Hybrid adaptive optics system for a solid-state zigzag master oscillator power amplifier laser system
Download:1062次
Boheng Lai
1,2,3
Lizhi Dong
1,2
Shanqiu Chen
1,2
Guomao Tang
1,2
[ ... ]
Yang Liu
4
Author Affiliations
Abstract
1
Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China
2
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
4
Institute of North Optics and Electronic, Beijing 100015, China
We present a hybrid adaptive optics system for a kW-class solid-state slab master oscillator power amplifier laser that consists of both a low-order aberration corrector and a 59-actuator deformable mirror. In this system large defocus and astigmatism of the beam are first corrected by the low-order aberration corrector and then the remaining components are compensated by the deformable mirror. With this sequential procedure it is practical to correct the phase distortions of the beam (peak to valley up to 100 μm) and the beam quality
β
is successfully improved to 1.9 at full power.
010.1080
Active or
adoptive optics
140.5680
Rare earth and transition metal solid-state lasers
090.1000
Aberration compensation
PDF全文
Full Text
Chinese Optics Letters
2016, 14(9): 091402
Atmospheric Optics and Oceanic Optics
Prototype of solar ground layer adaptive optics at the 1 m New Vacuum Solar Telescope
Lin Kong
1,2,3
Lanqiang Zhang
1,2,*
Lei Zhu
1,2
Hua Bao
1,2
[ ... ]
Changhui Rao
1,2
Author Affiliations
Abstract
1
The Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China
2
The Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
A prototype of a solar ground-layer adaptive optics (GLAO) system, which consists of a multi-direction correlating Shack–Hartmann wavefront sensor with 30 effective subapertures and about a 1 arcmin field of view (FoV) in each subaperture, a deformable mirror with 151 actuators conjugated to the telescope entrance pupil, and a custom-built real-time controller based on field-programmable gate array and multi-core digital signal processor (DSP), is implemented at the 1 m New Vacuum Solar Telescope at Fuxian Solar Observatory and saw its first light on January 12th, 2016. The on-sky observational results show that the solar image is apparently improved in the whole FoV over 1 arcmin with the GLAO correction.
010.1080
Active or
adoptive optics
110.1080
Active or
adoptive optics
PDF全文
Full Text
Chinese Optics Letters
2016, 14(10): 100102
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