| Adaptive Optics (AO) is a necessary way to achieve high-resolution observation of thesun through real-time imaging compensation. However, the field of view (FOV) of AO istypically only a few arcseconds because of the atmospheric anisoplanatism.Multi-conjugate adaptive optics (MCAO) which can expand the FOV effectively has beenused in the field of solar observation. In this paper, the theory and simulation of solarMCAO were studied, which can provide a theoretical foundation for further optimization ofdesign and engineering research.First of all, this paper stated the theory of atmospheric turbulence, analyzed thepropagation of light in the atmospheric turbulence and the influence of atmosphericturbulence on the astronomical observations.Secondly, the author discussed the theory of MCAO and the modeling method ofMCAO, and then constructed the solar MCAO simulation system.Subsequently, the author carried out the study on the performance of MCAO system.We focused on how the performance of a solar telescope was related to the numbers ofdeformable mirrors (DMs) and their conjugate heights. The results indicated that the DM’soptimal conjugate heights depended on the distribution of atmospheric turbulence. Then,the author analyzed the influence of the number of DMs on the performance of solarMCAO system in the FOV of0-60arcsec. In theory, for a solar MCAOsystem(D/r028.57) in a60arcsecdiameter FOV, by employing four DMs conjugated tocertain heights, the Strehl Ratio (SR) was0.57，which can meet the requirement of solartelescope; With the increase of the diameter of solar telescope and the FOV, more guidestars should be used to sense the aberration of the higher layer; moreover, with the increaseof the diameter of solar telescope, for a wider FOV, more DMs should be employed inMCAO system.Finally, the certain functions of MAOS were developed to simulate the solar MCAOsystem, the simulation results with the above theoretical results can be reciprocally verifiedeach other, and the influence of the number of DM actuators on the performance of solarMCAO system was studied preliminarily. |
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