Multilayer Conjugate Adaptive Optics System Research Of Conjugate Height

With the development of science and technology，exploration of the stars hasbecome more and more far-reaching significance activity for human. People need afaster communication rate. Microwave communication can no longer meet the needs.Lightwave is interested by high speed. But wavefront distortion caused by atmosphercturbulence affecting the quality of communication, when light passes through theatmosphere. To resolve the problem, an adaptive optics (AO) technology is adopted.The AO technology can be subtle to the wavefront aberrance caused by atmosphericdistortion, the fluctuation of the environment temperature etc. and allows to perform areal-time correction through adjusting the optical system. In order to obtain a largerfield of view, multi-conjugate adaptive optics (MCAO) has become one of the hotspotsof today’s international corrective optics, also has become the future direction ofdevelopment of adaptive optics technology.In this paper, we study on the MCAO system, simultaneously，the formula ofisoplanatic angle gain multiples in the MCAO system was derived and the influence ofthe size of the isoplanatic angle caused by selecting operating wavelength and zenithangle was excluded. Only from the refractive index structure constant, the number ofdeformable mirror and the location of conjugation to discuss the influence of the effectof gain of the isoplantatic angle which caused by the number of deformable mirror andthe high degree of conjugation in this system. On the basis of the original doubleconjugate system control vector expression, obtain the three-conjugate system controlvector expression. Furthermore, combined the different season of the atmosphericstructure constant in Hefei of China, Iterative approximation method was employed tocalculate the plane wave and spherical wave transmission and to calculate the locationof the each layer of conjugation in the system of the double and three conjugation underthe mode of transmission in the same high degree. In this paper, the field of satellite and ground communications needs the two-waytransmission of light waves has also been considered. In addition to analysis of thedouble and three-layer of conjugate system under the conventional ground observation,each layer of the line link in different seasons of the best position and the maximummultiples of gain angle,simultaneously also calculated uplink conjugate position andobtained more relevant data. The data were analyzed to seek the best conjugate positionof the up and down link which good for all seasons in the system of double and three-layer conjunction. Contrast the gain effects of the isoplanntic angle in the double-layerand the three-layer conjugate system and analyze the difference of the uplink anddownlink isoplanatic angle gain in the various systems. The aim of this investigationwas thus to provide critical experiment result, the gain of isoplanatic angle by the uplinkis better than the downlink in the system of the double and three-layer conjugationunder the mode of the vertical range transport.