为克服大气非等晕的影响, 多层共轭自适应光学(MCAO)系统被广泛应用于太阳望远镜, 以有效扩大校正视场。仅考虑由于大气非等晕造成的系统理论误差, 研究了变形镜(DM)个数及其共轭高度对太阳多层共轭自适应光学(MCAO)系统性能的影响。结果表明, MCAO系统中DM的最佳共轭高度取决于大气湍流的分布; 理论上, 太阳望远镜(D/r0=28.57)视场为1arcmin时, 只需两块DM, 太阳MCAO系统斯特列尔比(SR)可达0.55, 基本满足太阳望远镜的观测要求; 同时, 随着太阳望远镜口径的增大, 需通过增加DM个数以满足其在大视场观测的需求。

In order to overcome the effect of the atmospheric anisoplanatism, Multi Conjugate Adaptive Optics (MCAO) has been widely used to widen the field-of-view (FOV) of a solar telescope. Only considering the atmospheric anisoplanatism, the performance of a solar telescope is related to the numbers of deformable mirrors (DMs) and their conjugate heights. The performance of the solar MCAO system is quantified theoretically. The results indicate that the DM’s optimal conjugate heights depend on the distribution of atmospheric turbulence. In theory, for a solar MCAO system(D/r0=28.57) in a 1′ diameter FOV, by employing two DMs conjugated to certain heights, the Strehl Ratio (SR) of the MCAO system is 0.55, which can meet the requirement of solar telescope. With the increase of the diameter of solar telescope, for a wider FOV, more DMs will be employed in MCAO system.