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Hao Zhang1,*, Minghui Qiu1, Shouxin Kang1, Bo Liu1 andYinping Miao2DOI:&10.1002/mop.28765
Microwave and Optical Technology Letters pages 31&35, Author Information1Key Laboratory of Optical Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin, China2Tianjin Key Laboratory of Film Electronic and Communication Device, School of Electronics Information Engineering, Tianjin University of Technology, Tianjin, China*Corresponding author: Publication HistoryIssue published online: 18 NOV 2014Article first published online: 18 NOV 2014Manuscript Received: 7 JUN 2014
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acousto-interferflfiber offsetABSTRACTAn acoustically tunable bandpass filter has been presented by applying flexural acoustic wave modulation in the single-mode-fiber-microstructured-optical-fiber (SMF-MOF) hybrid structure with splicing offset between the MOF and lead-out SMF. Simultaneous acousto-optic mode coupling the SMF as well as MOF is simultaneously excited in these two types of optical fibers and owing to the presence of fiber offset at the output splicing joint, part of the cladding mode light in the MOF could be collected by the lead-out SMF to achieve bandpass filtering operation. Furthermore, the transmission spectral interference with acoustically controlled operation wavelength and fringe visibility has been investigated as well. & 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:31&35, 2015上传时间：
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扫一扫发现精彩Hybrid approach used for extended image-based wavefront sensor-less adaptive optics--《Chinese Optics Letters》2015年04期
Hybrid approach used for extended image-based wavefront sensor-less adaptive optics
【摘要】：The stochastic parallel gradient descent(SPGD) algorithm is widely used in wavefront sensor-less adaptive optics(WSAO) systems. However, the convergence is relatively slow. Modal-based algorithms usually provide much faster convergence than SPGD; however, the limited actuator stroke of the deformable mirror(DM) often prohibits the sensing of higher-order modes or renders a closed-loop correction inapplicable. Based on a comparative analysis of SPGD and the DM-modal-based algorithm, a hybrid approach involving both algorithms is proposed for extended image-based WSAO, and is demonstrated in this experiment. The hybrid approach can achieve similar correction results to pure SPGD, but with a dramatically decreased iteration number.
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In wavefront sensor-less adaptive optics(WSAO)systems,a distinct wavefront sensor is absent and a wavefrontcorrector is directly driven to optimize a metric functionrelated to image quality.The control algorithms in WSAOcan be divided into two categories
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