IMECH-IR  > 力学所知识产出(1956-2008)
Preliminary numerical simulation investigation of the cone effect in an adaptive optics system using a laser guide star
Yan HX(严海星); Li SS(李树山); Chen S(陈涉); 严海星 (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100080, Peoples R China.
Source PublicationADAPTIVE OPTICS AND APPLICATIONS III
2004
Conference NameConference on Adaptive Optics and Applications III
Conference DateNOV 08-09, 2004
Conference PlaceBeijing, PEOPLES R CHINA
AbstractSo-called cone effect or focus anisoplanatism is produced by the limited distance of a laser guide star (LGS) which is created within the Earth atmosphere and consequently located at a finite distance from the observer. We believe this is the first time to investigate the cone effect of the LGS by means of a pure numerical simulation. In this paper, the cone effect of the LGS for different vertical profiles of the refractive index structure constant C-n(2) is numerically investigated by using a revised computer program of atmospheric propagation of optical wave and an adaptive optics (AO) system including dynamic control process. It is surprisingly found that the effect of altitudes of the LGS on the AO phase compensation effectiveness by using the commonly-available vertical profiles of C-n(2) and the lateral wind speed in the atmosphere is relatively weak, and the cone effect for some C-n(2) profiles is even negligible. It is found that the cone effect seems not have obvious relationship with the turbulence strength, however, it depends on the vertical distribution profile of C-n(2) apparently. On the other hand, the cone effect depends on the vertical distribution of the lateral wind speed as well. The cone effect becomes more obvious as the zenith angle increases. In comparison to a near infrared wavelength, the cone effect becomes larger in the case of the visible wavelength. In all cases concerned in this paper, an AO system by using a sodium guide star has almost same phase compensation effectiveness as that by using the astronomical target itself as a beacon.
WOS IDWOS:000226862200007
ISBN0-8194-5594-6
URL查看原文
Indexed ByCPCI-S ; EI
Language英语
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Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/58909
Collection力学所知识产出(1956-2008)
Corresponding Author严海星 (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100080, Peoples R China.
Recommended Citation
GB/T 7714
Yan HX,Li SS,Chen S,et al. Preliminary numerical simulation investigation of the cone effect in an adaptive optics system using a laser guide star[C]. BELLINGHAM:SPIE-INT SOC OPTICAL ENGINEERING,2004.
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