Prospect of liquid crystal adaptive optics in astronomy application

Li, 宣丽 Xuan; Da-yu, 李大禹 Li; Yonggang, 刘永刚 Liu

doi:10.3788/yjyxs20153001.0001b

Cited by 5 publications

(2 citation statements)

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“…Because of atmospheric random disturbances, the wavefront from a star will be distorted, which blurs the image captured by large aperture, ground-based optical telescopes. Adaptive optics (AOs) [1,2] technology can be used to restore the imaging resolution close to the telescope diffraction limit by compensating the aberration induced by atmospheric turbulence in real time. The AO system is now considered to be an essential setup of many new large aperture optical telescopes.…”

Section: Introductionmentioning

confidence: 99%

Configuration optimization of laser guide stars and wavefront correctors for multi-conjugation adaptive optics

et al. 2016

Chinese Phys. B

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Multi-conjugation adaptive optics (MCAOs) have been investigated and used in the large aperture optical telescopes for high-resolution imaging with large field of view (FOV). The atmospheric tomographic phase reconstruction and projection of three-dimensional turbulence volume onto wavefront correctors, such as deformable mirrors (DMs) or liquid crystal wavefront correctors (LCWCs), is a very important step in the data processing of an MCAO's controller. In this paper, a method according to the wavefront reconstruction performance of MCAO is presented to evaluate the optimized configuration of multi laser guide stars (LGSs) and the reasonable conjugation heights of LCWCs. Analytical formulations are derived for the different configurations and are used to generate optimized parameters for MCAO. Several examples are given to demonstrate our LGSs configuration optimization method. Compared with traditional methods, our method has minimum wavefront tomographic error, which will be helpful to get higher imaging resolution at large FOV in MCAO.

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Section: Introductionmentioning

confidence: 99%

Configuration optimization of laser guide stars and wavefront correctors for multi-conjugation adaptive optics

et al. 2016

Chinese Phys. B

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“…Adaptive optics (AO) has been widely used in various research areas, [1][2][3] such as astronomical observation by groundbased telescopes. In AO systems, the Shack-Hartmann wavefront sensor (S-H WFS) has been most popularly used for its high speed and high precision.…”

Section: Introductionmentioning

confidence: 99%

High signal-to-noise ratio sensing with Shack–Hartmann wavefront sensor based on auto gain control of electron multiplying CCD

Zhu

et al. 2016

Chinese Phys. B

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High signal-to-noise ratio can be achieved with the electron multiplying charge-coupled-device (EMCCD) applied in the Shack-Hartmann wavefront sensor (S-H WFS) in adaptive optics (AO). However, when the brightness of the target changes in a large scale, the fixed electron multiplying (EM) gain will not be suited to the sensing limitation. Therefore an auto-gain-control method based on the brightness of light-spots array in S-H WFS is proposed in this paper. The control value is the average of the maximum signals of every light spot in an array, which has been demonstrated to be kept stable even under the influence of some noise and turbulence, and sensitive enough to the change of target brightness. A goal value is needed in the control process and it is predetermined based on the characters of EMCCD. Simulations and experiments have demonstrated that this auto-gain-control method is valid and robust, the sensing SNR reaches the maximum for the corresponding signal level, and especially is greatly improved for those dim targets from 6 to 4 magnitude in the visual band.

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Magnetic fluid based deformable mirror for aberration correction of liquid telescope

Kong

et al. 2017

Optoelectron. Lett.

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Prospect of liquid crystal adaptive optics in astronomy application

Cited by 5 publications

References 0 publications

Configuration optimization of laser guide stars and wavefront correctors for multi-conjugation adaptive optics

Configuration optimization of laser guide stars and wavefront correctors for multi-conjugation adaptive optics

High signal-to-noise ratio sensing with Shack–Hartmann wavefront sensor based on auto gain control of electron multiplying CCD

Magnetic fluid based deformable mirror for aberration correction of liquid telescope

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