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Elimination of misalignment errors in testing long shape optics

Guangxue Jingmi Gongcheng/Optics and Precision Engineering 2011年第SUPPL.2期19卷 266-269页

作者： Wang, Xiao-Kun Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China

This paper analyzes the drawbacks of current interferogram software with Zernike polynomials in testing a long shape optics. It shows that the Zernike polynomials are no longer orthogonal over a long region and can not show explicit physical meanings. Therefore, it proposes a method to eliminate the misalignment errors of the long shape optics, then establishes a reasonable mathematical model based on the least squares fitting and develops a software for removing errors. The experiment is conducted for a 512 mm×163 mm aspherical mirror by null-compensation and results indicate that the misalignment errors have been eliminated from the original phase distribution exactly, thus the accurate surface map can be obtained. Furthermore, the method also can be used to eliminate the misalignment errors for the optics in regulation, octagon or other shapes.

关键词： Errors

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Processing technology of back transmission null compensation testing off-axis convex aspheric mirror

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Guangxue Jingmi Gongcheng/Optics and Precision Engineering 2011年第7 SUPPL.期19卷 190-196页

作者： Zhang, Feng Xue, Dong-Lin Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China

In order to acquire a high precise off-axis convex aspheric mirror, the processing technology of back transmission null compensation testing off-axis convex aspheric mirror was introduced. Firstly, the parameters and specification requirements of the off-axis convex aspheric mirror were presented. Then, the practical schemes for fabricating and testing the off-axis convex aspheric mirror were discussed. Next, the Computer-controlled optical Surfacing(CCOS) and zone polishing technology for manufacturing back transmission null compensation testing off-axis convex aspheric mirror were researched. Finally, the off-axis convex aspheric mirror was tested. The testing results indicate that the surface figure accuracy of the off-axis convex aspheric mirror is 0.018λ RMS(λ=0.6328 μm), the surface figure accuracy of the back plane is 0.01λ RMS(λ=0.6328 μm), the wedge between the back plane of the off-axis convex aspheric mirror and the designed plane is 9″, and the thickness error of the off-axis convex aspheric mirror is 0.005 mm. It can meet the requirements of the optical design.

关键词： Aspherics

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Research on tolerance distribution of wavefront coded system based on MTF stmilarity

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Zhongguo Jiguang/Chinese Journal of Lasers 2011年第SUPPL. 1期38卷 s116006-1-s116006-5页

作者： Yan, Feng Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun Jilin 130033 China

Wavefront coding technology (WFC) is a kind of joint optical-digital imaging technology, which can extend the depth of focus (DOF) of optical systems and control the defocus and defocus related aberrations. Another important character of the WCT is to enlarge the error budget of optical systems. The modulation transfer function (MTF) invariance is defined in this paper and the comparison of MTF invariance among original system, wavefront coded system with original tolerance and wavefront coded system with new tolerance is presented. The new tolerance of wavefront coded off-axis three mirror anastigmatic system is presented according to certain criteria and the application of WCT is validated quantitatively.

关键词： optical transfer function

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Magnetic medium assistant polishing technology

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Zhongguo Jiguang/Chinese Journal of Lasers 2011年第SUPPL. 1期38卷 s116004-1-s116004-4页

作者： Deng, Weijie Zhang, Feng Li, Ruigang Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun Jilin 130031 China

In this paper, a novel magnetic medium assistant polishing technology and device is researched to complete the finish step of the optics. As the device working, the magnetic powder arranged with the magnetic field distribution. The magnetic powder became a flexible brush. The magnet wheel working with a high rolling velocity and the polishing liquid with abrasive is injected to contact region. The magnetic powder flexible brush is reforming with the magnetic field all the time, so the removal tool of the fabrication is invariable. The design and manufacture is finished and the device was connected to the CNC machine and experiment is completed to get the removal function, and roughness with K9 glass. The technology could be used in the practical fabrication.

关键词： Fabrication

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Increasing the efficiency of CCOS by local deconvolution algorithm

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Zhongguo Jiguang/Chinese Journal of Lasers 2011年第SUPPL. 1期38卷 s116003-1-s116003-5页

作者： Li, Ruigang Deng, Weijie Yan, Feng Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun Jilin 130033 China

The convergent efficiency of computer-controlled optical surfacing (CCOS) relates to many factors such as algorithm, parameter settings, tool and abrasive. A kind of local deconvolution algorithm with high efficiency is put forward, firstly plotting the error figure to manufacturing area and non-manufacturing area, and programming the manufacturing trace in each manufacturing area, then doing deconvolution in local area along the manufacturing path, thus getting the dwell time of the tool in each area, lastly according the nearest point criterion to switch from one manufacturing area to the other. The ratio of the efficient manufacturing time to the total running time of the tool is raised greatly, so the whole manufacturing efficiency is increased, and the mid-frequency error is restricted to some extent.

关键词： Efficiency

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Effective medium theory applied to frequency selective surfaces on periodic substrates

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Chinese Optics Letters 2010年第12期8卷 1175-1177页

作者：朱华新高劲松赵晶丽王彤彤冯晓国梁凤超王岩松陈新 Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences

We apply the effective medium theory combined with the conventional periodic method of moments （MoM） to analyze frequency selective surfaces （FSSs） on periodic and anisotropic substrates. Based on the effective medium theory, even periodic and anisotropic substrates can be considered homogeneous; thus, the Green’s function can be obtained. The resulting integral equation can then be solved by the MoM using rooftop basis functions and Galerkin testing functions. We analyze an example using this technique, and the numerical results agree with Fallahi’s full-vector semi-analytical method, showing an increasing difference between the results as the frequencies increase. These results show that the proposed method is effective for analyzing FSSs on periodic and anisotropic substrates.

关键词： Anisotropic media Anisotropy Method of moments Numerical methods Substrates

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Effect of temperature gradient on optical telescope system in laser communication

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Guangxue Jingmi Gongcheng/Optics and Precision Engineering 2011年第SUPPL.2期19卷 241-244页

作者： Zhang, Zhong-Yu Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China Key Laboratory of Optical System Advanced Manufacturing Technology Chinese Academy of Sciences Changchun 130033 China

On the basis of the structure design for an optical telescope system that can transmit and receive laser signals at a satellite laser communication terminal, this paper researches its thermal and mechanical characteristics in the temperature gradient fields. By finite element analysis, it simulates the surface accuracy of optical components and their spatial variation for the optical telescope system under the temperature gradient. The simulation results gave the characteristics of geometric precision and spatial positions of the optical components, and it points out that the optical telescope can transmit and receive laser signals when the temperature gradient is controlled within ±2°C. The simulation results have been applied to the implementation of the thermal control system for effectively controlling the optical performance of optical telescope system and meets the needs of laser communications.

关键词： Thermal gradients

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design and analysis of a novel actuator topology of deformable mirrors

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Zhongguo Jiguang/Chinese Journal of Lasers 2011年第SUPPL. 1期38卷 s116007-1-s116007-6页

作者： Chen, Xindong Zheng, Ligong Zhang, Xuejun Key Laboratory of Optical System Advanced Manufacturing Technology Chanchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun Jilin 130033 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The deformation of a continuous facesheet DM with discrete push-pull actuators in the thin plate approximation is described by the differential equation. Analysis of the equation shows that to achieve a high quality correction of low-order aberrations, deformable mirrors should have some actuators positioned outside the correction aperture. By finite element analysis, the correcting abilities of defocus, astig and coma are compared. A novel design of 9 actuators positioned on the edge of aperture and mirror is proposed and optimized. The analysis results show that the new design improves the correcting abilities, especially for coma which is hard to correct. Finally the wavefront correction and modal correction methods are compared.

关键词： Adaptive optics

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Manufacture of Φ1.2m reaction bonded silicon carbide mirror blank CFID

Manufacture of Φ1.2m reaction bonded silicon carbide mirror...

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5th International Symposium on advanced optical manufacturing and Testing Technologies

作者： Zhang, Ge Zhao, Rucheng Zhao, Wenxing Bao, Jianxun Changchun Institute of Optics Fine Mechanics and Physics Key Laboratory of Optical System Advanced Manufacturing Technology Chinese Academy of Sciences Changchun 130033 China

ISBN: (纸本)9780819480842

Silicon carbide (SiC) is a new type candidate material for large-scale lightweight space mirror. Its low thermal distortion, high stiffness, fine optical quality and dimensional stability, make SiC an ideal material for large space born telescope. Since ten years Changchun institute optics, fine mechanics and physics (CIOMP) has developed reaction bonded SiC (RB-SiC) technology for space application, and can fabricate RB-SiC mirror with scale less than 1.0 meter for telescope. The green body is prepared with gel-casting method which is an attractive new ceramic forming process for making high-quality, complex-shaped ceramic parts. And then unmolding, drying, binder burning out, reacting bonded, the RB-SiC can be obtained. But with the development of space-born or ground telescope, the scale of primary mirror has exceeded 1.0 meter. So CIOMP has developed an assembly technique which called novel reaction-formed joint technology for larger RB-SiC mirror blank. The steps include joining of green bodies with mixture comprised of SiC particles and phenolic resin etc, firing, machining and sintering. Joining the Φ1.2 meter RB-SiC mirror blank by the novel reaction-formed joint technology. And testing the welding layer's performance, the results show that the thickness of 54-77μm, the microstructure and thermal property can be comparable to the substrate and the mechanical property are excellent in bending strength of 307MPa. © 2010 Copyright SPIE - The International Society for optical Engineering.

关键词： Mirrors

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Transmission properties of multiband fss based on fractal elements

Transmission properties of multiband fss based on fractal el...

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2010 9th International Symposium on Antennas Propagation and EM Theory, ISAPE 2010

作者： Wang, Shanshan Gao, Jinsong Xu, Nianxi Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Science China Graduate University of Chinese Academy of Sciences China

ISBN: (纸本)9781424469062

Self-similar fractal elements that has multiband properties can be advantageously exploited to design simple, multiband FSS on single screen. In this paper, fractal Y aperture FSS has been designed using recursive technology and the periodic method of moments(PMoM) is employed to characterize the transmission properties of FSS as band-pass filters. The frequency response to the structure parameters when electromagnetic wave incident with different angles and polarizations is discussed and the numerical analysis show good correlation to the measured results. ©2010 IEEE.

关键词： Bandpass filters

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