中国物理B ›› 2009, Vol. 18 ›› Issue (3): 1089-1095.doi: 10.1088/1674-1056/18/3/042

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Thermal stability test and analysis of a 20-actuator bimorph deformable mirror

饶长辉1, 姜文汉1, 宁禹2, 余浩2, 周虹3   

  1. (1)College of Photon-electron Science and Engineering, National University of Defense Technology, Changsha 410073, China; (2)College of Photon-electron Science and Engineering, National University of Defense Technology, Changsha 410073, China;Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China; (3)Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China;Graduate School of the Chinese Academy of Science, Beijing 100039, China
  • 收稿日期:2008-06-12 修回日期:2008-07-21 出版日期:2009-03-20 发布日期:2009-03-20
  • 基金资助:
    Project supported by the Key Project of National Natural Science Foundation of China (Grant No 60438030).

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)   

  1. 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
  • Received:2008-06-12 Revised:2008-07-21 Online:2009-03-20 Published:2009-03-20
  • Supported by:
    Project supported by the Key Project of National Natural Science Foundation of China (Grant No 60438030).

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摘要： 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.

关键词: adaptive optics, bimorph deformable mirror, thermal stability

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.

Key words: adaptive optics, bimorph deformable mirror, thermal stability

中图分类号:  (Lenses, prisms and mirrors)

  • 42.79.Bh
07.07.Tw (Servo and control equipment; robots) 62.20.D- (Elasticity) 81.40.Jj (Elasticity and anelasticity, stress-strain relations) 68.60.Dv (Thermal stability; thermal effects)