Thermal stability test and analysis of a 20-actuator bimorph deformable mirror
Ning Yu(宁禹)a)b)†, Zhou Hong(周虹)b)c), Yu Hao(余浩)a)b), Rao Chang-Hui(饶长辉)b), and Jiang Wen-Han(姜文汉)b)
a College of Photon-electron Science and Engineering, National University of Defense Technology, Changsha 410073, China; b Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China; c Graduate School of the Chinese Academy of Science, Beijing 100039, China
Abstract One of the important characteristic of adaptive mirrors is the thermal stability of surface flatness. In this paper, the thermal stability from 13℃ to 25℃ of a 20-actuator bimorph deformable mirror is tested by a Shack--Hartmann wavefront sensor. Experimental results show that, the surface P--V of bimorph increases nearly linearly with ambient temperature. The ratio is 0.11μm/℃ and the major component of surface displacement is defocused, compared with which, astigmatism, coma and spherical aberration contribute very small. Besides, a finite element model is built up to analyse the influence of thickness, thermal expansion coefficient and Young's modulus of materials on thermal stability. Calculated results show that bimorph has the best thermal stability when the materials have the same thermal expansion coefficient. And when the thickness ratio of glass to PZT is 3 and Young's modulus ratio is approximately 0.4, the surface instability behaviour of the bimorph manifests itself most severely.
Received: 12 June 2008
Revised: 21 July 2008
Accepted manuscript online:
Fund: Project supported by the Key
Project of National Natural Science Foundation of China (Grant No
60438030).
Cite this article:
Ning Yu(宁禹), Zhou Hong(周虹), Yu Hao(余浩), Rao Chang-Hui(饶长辉), and Jiang Wen-Han(姜文汉) Thermal stability test and analysis of a 20-actuator bimorph deformable mirror 2009 Chin. Phys. B 18 1089
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