Numerical analysis of modal tomography for solar multi-conjugate adaptive optics  

作　　者：Bing Dong De-Qing Ren Xi Zhang 

机构地区：[1]Physics ＆ Astronomy Department, California State University Northridge, CA, 91330-8268, USA [2]National Astronomical Observatories/Nanjing Institute of Astronomical Optics ＆ Technology,Chinese Academy of Sciences, Nanjing 210042, China

出　　处：《Research in Astronomy and Astrophysics》2012年第4期465-471,共7页天文和天体物理学研究（英文版）

摘　　要：Multi-conjugate adaptive optics （MCAO） can considerably extend the cor- rected field of view with respect to classical adaptive optics, which will benefit solar observation in many aspects. In solar MCAO, the Sun structure is utilized to provide multiple guide stars and a modal tomography approach is adopted to implement three- dimensional wavefront restorations. The principle of modal tomography is briefly re- viewed and a numerical simulation model is built with three equivalent turbulent lay- ers and a different number of guide stars. Our simulation results show that at least six guide stars are required for an accurate wavefront reconstruction in the case of three layers, and only three guide stars are needed in the two layer case. Finally, eigen- mode analysis results are given to reveal the singular modes that cannot be precisely retrieved in the tomography process.Multi-conjugate adaptive optics （MCAO） can considerably extend the cor- rected field of view with respect to classical adaptive optics, which will benefit solar observation in many aspects. In solar MCAO, the Sun structure is utilized to provide multiple guide stars and a modal tomography approach is adopted to implement three- dimensional wavefront restorations. The principle of modal tomography is briefly re- viewed and a numerical simulation model is built with three equivalent turbulent lay- ers and a different number of guide stars. Our simulation results show that at least six guide stars are required for an accurate wavefront reconstruction in the case of three layers, and only three guide stars are needed in the two layer case. Finally, eigen- mode analysis results are given to reveal the singular modes that cannot be precisely retrieved in the tomography process.

关 键 词：instrumentation： multi-conjugate adaptive optics -- tomography 

分 类 号：O439[机械工程—光学工程] P542.3[理学—光学]