ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Influence of low temperature on the surface deformation of deformable mirrors |
Juncheng You(尤俊成)1,2,3, Chunlin Guan(官春林)1,2, Hong Zhou(周虹)1,2 |
1 Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China; 2 Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China; 3 University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The two factors which influence the low temperature performance of deformable mirrors (DMs) are the piezoelectric stroke of the actuators and the thermally induced surface deformation of the DM. A new theory was proposed to explain the thermally induced surface deformation of the DM: because the thermal strain between the actuators and the base leads to an additional moment according to the theory of plates, the base will be bent and the bowing base will result in an obvious surface deformation of the facesheet. The finite element method (FEM) was used to prove the theory. The results showed that the thermally induced surface deformation is mainly caused by the base deformation which is induced by the coefficient of thermal expansion (CTE) mismatching; when the facesheet has similar CTE with the actuators, the surface deformation of the DM would be smoother. Then an optimized DM design was adopted to reduce the surface deformation of the DMs at low temperature. The low temperature tests of two 61-element discrete PZT actuator sample deformable mirrors and the corresponding optimized DMs were conducted to verify the simulated results. The results showed that the optimized DMs perform well.
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Received: 11 December 2016
Revised: 07 January 2017
Accepted manuscript online:
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PACS:
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42.79.Bh
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(Lenses, prisms and mirrors)
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07.07.Tw
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(Servo and control equipment; robots)
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68.60.Dv
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(Thermal stability; thermal effects)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11178004). |
Corresponding Authors:
Chunlin Guan
E-mail: youjuncheng722078@126.com
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Cite this article:
Juncheng You(尤俊成), Chunlin Guan(官春林), Hong Zhou(周虹) Influence of low temperature on the surface deformation of deformable mirrors 2017 Chin. Phys. B 26 054215
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