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Optical Engineering

Experimental evaluation of a positive-voltage-driven unimorph deformable mirror for astronomical applications
Author(s): Junjie Chen; Jianqiang Ma; Yuxin Mao; Ying Liu; Baoqing Li; Jiaru Chu
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Paper Abstract

A modified low-cost unimorph deformable mirror (DM) driven only by positive voltages for atmospheric turbulence compensation is presented. The 214 patterned inner actuators generate convex deformations for aberration correction, while one outer ring actuator generates an overall concave bias. To evaluate the aberration correction capability of the proposed DM, the iterative reconstruction of Zernike aberrations and correction were performed in an adaptive optics test system. The experimental results indicate that the fabricated DM has an excellent aberration correction capability, particularly matching the first 20 term Zernike aberrations with the normalized residual root-mean-square (RMS) error <5%. Furthermore, the random atmospheric turbulence aberrations were simulated based on Karhunen–Loève coefficients and reconstructed using the fabricated DM. The simulative and experimental results show that the atmospheric turbulence aberrations can be steadily compensated with λ/40 (λ=2.2  μm) RMS residual error, indicating the prospect for atmospheric applications.

Paper Details

Date Published: 3 November 2015
PDF: 6 pages
Opt. Eng. 54(11) 117103 doi: 10.1117/1.OE.54.11.117103
Published in: Optical Engineering Volume 54, Issue 11
Show Author Affiliations
Junjie Chen, Univ. of Science and Technology of China (China)
Jianqiang Ma, Ningbo Univ. (China)
Yuxin Mao, Univ. of Science and Technology of China (China)
Ying Liu, Univ. of Science and Technology of China (China)
Baoqing Li, Univ. of Science and Technology of China (China)
Jiaru Chu, Univ. of Science and Technology of China (China)

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