Reserch On Bimorph Deformable Mirror And Its Application In Adaptive Optics

The Adaptive Optics(AO) can compensate the dynamical interference caused by theoptical wave-front distortion in real-time. With an AO system, the regular optical systemhas the ability to automatically adapt to external conditions to maintain optimumworking performance. At the beginning of this century, many other optical systemsbesides to astronomy are intrested in adaptive optics, including human retinal imagingsystems, laser communication system,etc. But the cost of deformable mirrors(DM)-dueto its technical complexity, become the main obstacle to expand the field of applicationof adaptive optics. So a variety of low-cost alternative technologies become the new hottopic of the adaptive optics. Bimorph deformable mirror is one of them. Research onbimorph deformable mirror is of great significance to the promotion of the developmentof domestic adaptive optical system.This thesis describes the modeling and manufacture of bimorph deformablemirrors as well as two example of their applications.A general review of adaptive opticsand deformable mirrors is provided, paying particular attention to those technologieswhich would allow adaptive optics to be employed in non-astronomical low-costsituations. Reasonable finite element model of the bimorph deformable mirror wasestablished. The process of manufacturing bimorph deformable mirrors is described insome detail, and results of this peocedure are presented. Design and fabricate a20-element prototype Bimorph DM, and detail test results proved the accuracy of ourFEA model and fabrication process. Based on this, a pair of bimorph deformablemirrors for dual-deformable mirror human retinal imaging system are designed andfabricated. A novel full function adaptive optics system applied to laser cutting systemis proposed, including wavefront-less control algorithm and low cost bimorphdeformable mirror are used. The effectiveness of this system is demonstrated by twosets of closed loop experiments.The main results of this paper are following:1, Formulate a reasonable design and fabricate process and the first practicalbimorph deformable mirror in the domestic was manufactured；2, A combination of FEM analysis and experimental verification of bimorphdeformable mirror are established; The characteristics of bimorph deformable mirrorthat suitable for correction of low-order aberrations are verified;3, Two different bimorph deformable mirrors for dual-deformable mirror human retinal imaging system are manufactured. Measurement results indicate that they satisfythe requirement and are better for human retinal imaging adaptive optical system thanconventional stack actuator deformable mirror. A novel full function adaptive opticssystem applied to laser cutting system is proposed. The validity of this system isdemonstrated by two sets of closed loop experiments.