Materials, Photonic Devices, and Sensors

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

[+] Author Affiliations
Junjie Chen

University of Science and Technology of China, Department of Precision Machinery and Precision Instrumentation, Jinzhai Road 96, Hefei 230027, China

Jianqiang Ma

Ningbo University, Faculty of Mechanical Engineering & Mechanics, Fenghua Road 818, Ningbo 315211, China

Yuxin Mao, Ying Liu, Baoqing Li, Jiaru Chu

University of Science and Technology of China, Department of Precision Machinery and Precision Instrumentation, Jinzhai Road 96, Hefei 230027, China

Opt. Eng. 54(11), 117103 (Nov 03, 2015). doi:10.1117/1.OE.54.11.117103
History: Received July 21, 2015; Accepted October 8, 2015
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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=2.2μm) RMS residual error, indicating the prospect for atmospheric applications.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Junjie Chen ; Jianqiang Ma ; Yuxin Mao ; Ying Liu ; Baoqing Li, et al.
"Experimental evaluation of a positive-voltage-driven unimorph deformable mirror for astronomical applications", Opt. Eng. 54(11), 117103 (Nov 03, 2015). ; http://dx.doi.org/10.1117/1.OE.54.11.117103


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