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Measurement of non-common path static aberrations in an interferometric camera by phase diversity
Yan, Zhaojun1,2,3,4; Herbst, Thomas M.1; Yang, Pengqian1,2; Bizenberger, Peter1; Zhang, Xianyu1,2,3,4; Conrad, Albert R.1; Bertram, Thomas1; Kuerster, Martin1; Rix, Hans-Walter1; Li, Xinyang2,3; Rao, Changhui2,3; Yan, Z. (yan@mpia.de)
Volume8417
Pages841726
2012
Language英语
ISSN0277786X
DOI10.1117/12.974523
Indexed ByEi
Subtype会议论文
AbstractLINC-NIRVANA (LN) is a near-infrared image-plane beam combiner with advanced, multi-conjugated adaptive optics for the Large Binocular Telescope. Non-common path aberrations (NCPAs) between the near-infrared science camera and the wave-front sensor (WFS) are unseen by the WFS and therefore are not corrected in closed loop. This would prevent LN from achieving its ultimate performance. We use a modified phase diversity technique to measure the internal optical static aberrations and hence the NCPAs. Phase diversity is a methodology for estimating wave-front aberrations by solving an unconstrained optimization problem from multiple images whose pupil phases differ from one another by a known amount. We conduct computer simulations of the reconstruction of aberrations of an optical system with the phase diversity method. In the reconstruction, we fit the wave-front to Zernike polynomials to reduce the number of variables. The limited-memory Broyden-Fletcher-Goldfarb-Shanno (L-BFGS) algorithm is very well suited to phase diversity (PD) due to its good performance in solving large scale optimization problems. The main constraint for the implementation of PD for LN is that we cannot add extra components to the internal interferometric camera imaging system to obtain infocus and defocus images. In this paper, we introduce a new method, namely shifting the focal plane source, not the detector, to overcome this constraint. Some experiments were done to test and verify this method and the results are presented and discussed. The study shows that the method is very flexible and the paper gives practical guidelines for the application of phase diversity methods to characterize adaptive optics systems. © 2012 SPIE.; LINC-NIRVANA (LN) is a near-infrared image-plane beam combiner with advanced, multi-conjugated adaptive optics for the Large Binocular Telescope. Non-common path aberrations (NCPAs) between the near-infrared science camera and the wave-front sensor (WFS) are unseen by the WFS and therefore are not corrected in closed loop. This would prevent LN from achieving its ultimate performance. We use a modified phase diversity technique to measure the internal optical static aberrations and hence the NCPAs. Phase diversity is a methodology for estimating wave-front aberrations by solving an unconstrained optimization problem from multiple images whose pupil phases differ from one another by a known amount. We conduct computer simulations of the reconstruction of aberrations of an optical system with the phase diversity method. In the reconstruction, we fit the wave-front to Zernike polynomials to reduce the number of variables. The limited-memory Broyden-Fletcher-Goldfarb-Shanno (L-BFGS) algorithm is very well suited to phase diversity (PD) due to its good performance in solving large scale optimization problems. The main constraint for the implementation of PD for LN is that we cannot add extra components to the internal interferometric camera imaging system to obtain infocus and defocus images. In this paper, we introduce a new method, namely shifting the focal plane source, not the detector, to overcome this constraint. Some experiments were done to test and verify this method and the results are presented and discussed. The study shows that the method is very flexible and the paper gives practical guidelines for the application of phase diversity methods to characterize adaptive optics systems. © 2012 SPIE.
Conference NameProceedings of SPIE: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Conference Date2012
Citation statistics
Document Type会议论文
Identifierhttp://ir.ioe.ac.cn/handle/181551/7786
Collection自适应光学技术研究室(八室)
Corresponding AuthorYan, Z. (yan@mpia.de)
Affiliation1. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
2. Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
3. Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China
4. Graduate School, Chinese Academy of Sciences, Beijing 100039, China
Recommended Citation
GB/T 7714
Yan, Zhaojun,Herbst, Thomas M.,Yang, Pengqian,et al. Measurement of non-common path static aberrations in an interferometric camera by phase diversity[C],2012:841726.
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