Flatten Calibration of Deformable Mirror Based on the Measurement of the Interferometer

We describe a closed-loop holographic laser adaptive optics system (HLAOS) based on a holographic wavefront sensor (HWFS) and 21-element continuous-surface piezoelectric deformable mirror (DM). The principle behind HWFSs is described, and then the response sensitivity and crosstalk effect on the lowest 12 Zernike modes of aberration are analyzed. Next, the wavefront-correction capability of the 21-element DM is analyzed. The closed-loop correction of the HLAOS to a static aberration is then numerically simulated. We report a practical implementation of the HLAOS and compare the aberration-compensation effect with a traditional adaptive optics system based on a 37-unit Shark-Hartmann sensor. The practically relevant parameters are analyzed and the experimental results show that an HLAOS using a piezoelectric DM can achieve a correction capability comparable to that of a traditional adaptive optics system.

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Analysis of a holographic laser adaptive optics system using a deformable mirror

Yao

Wang

Liu

et al. 2017

Appl. Opt.

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Research on the compensation of laser launch optics to improve the performance of the LGS spot

Liu

Wang

Wang³

et al. 2018

Appl. Opt.

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To improve the beam quality of the uplink laser, a 37 channel piezo-ceramic deformable mirror was inserted into the laser launch optics to compensate the static aberrations. An interferometer was used as the calibration light source as well as the wavefront sensor to perform closed-loop correction for the moment. About 0.38λ root mean square (rms) aberrations, including the deformable mirror's initial figure error, were compensated, and the residual error was less than 0.07λ rms. Field observations with a 2 m optical telescope demonstrated that the peak intensity value of the laser guide star (LGS) spot increased from 5650 to 7658, and the full width at half-maximum (FWHM) size reduced from 4.07 arcseconds to 3.52 arcseconds. With the compensation, an improved guide star spot can be obtained, which is crucial for the adaptive optics systems of ground-based large telescopes.

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A closed-loop aberration compensating method of optics system based on holography

Yan-Qiu¹,

Sun²,

Jian³

et al. 2015

Acta Phys. Sin.

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We propose a holographic adaptive optics system based on holographic wavefront sensor and 21-element deformable mirror, and analyze the wavefront correction ability of the system in this paper. The principle of holographic wavefront sensor is described, and its numerical model is provided by fast Fourier transform algorithm in the thin hologram approximation. Then, the wavefront correction ability of 21-element deformable mirror is analyzed with its numerical model. Finally, the aberration compensation of the system is simulated and an experimental device is set up to verify the feasibility of the proposed adaptive optics system.

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Flatten Calibration of Deformable Mirror Based on the Measurement of the Interferometer

Cited by 3 publications

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Analysis of a holographic laser adaptive optics system using a deformable mirror

Analysis of a holographic laser adaptive optics system using a deformable mirror

Research on the compensation of laser launch optics to improve the performance of the LGS spot

A closed-loop aberration compensating method of optics system based on holography

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