人造信标自适应光学系统中的非等晕性

ANISOPLANATISM IN ADAPTIVE OPTICS USING SYNTHETIC BEACONS

推导了人造信标自适应光学系统对激光大气传输湍流效应进行位相补偿时信标光与主激光间的剩余位相结构函数，讨论了人造信标自适应光学系统中的非等晕性—聚焦非等晕性。

AbstractSynthetic beacon(or laser guide stars),created by the backscatter of intense laser beams,offer a practical means to extend the utility of adaptive optics￣[1-3]. For someapplications such astronomy and high power laser beam propagation through atmospherewithout cooperative beacon,the synthetic beacon is at much closer range from thetransmitting aperture than the object of interest. Fig 1 illustrates that the light from thesynthetic beacon does not traverse exactly the same path through the atmosphere as themain laser beam. which will introduce a wavefront error known as focal anisoplanatism. In this paper,the residual phase structure function and residual phase variance of mainlaser beam with synthetic beacons are derived based on the approximation of Eq.(5).Theeffects of focal anisoplanatism on the compensation efficiency (Strehl ratio) of adaptiveoptical system using synthetic beacons are discussed;The results show that focal anisoplanatismdecreases as the beacon altitude increases and it is advantageous to place the beacon atthe highest practical altitude. The error of focal anisoplanatism increases as thetransmitting aperture(or receiving aperture)increases