Experimental evaluation of a positive-voltage-driven unimorph deformable mirror for astronomical applications

Junjie Chen; Jianqiang Ma; Yuxin Mao; Ying Liu; Baoqing Li; Jiaru Chu

doi:10.1117/1.OE.54.11.117103

3 November 2015 Experimental evaluation of a positive-voltage-driven unimorph deformable mirror for astronomical applications

Junjie Chen, Jianqiang Ma, Yuxin Mao, Ying Liu, Baoqing Li, Jiaru Chu

Author Affiliations +

Optical Engineering, Vol. 54, Issue 11, 117103 (November 2015). https://doi.org/10.1117/1.OE.54.11.117103

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.

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Junjie Chen, Jianqiang Ma, Yuxin Mao, Ying Liu, Baoqing Li, and Jiaru Chu "Experimental evaluation of a positive-voltage-driven unimorph deformable mirror for astronomical applications," Optical Engineering 54(11), 117103 (3 November 2015). https://doi.org/10.1117/1.OE.54.11.117103

Published: 3 November 2015

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