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激光中继镜技术是近年来备受瞩目的一项新技术,能量耦合效率是中继镜系统的关键因素之一。中继镜系统采用双望远镜结构实现光束上行传输与接收,光束上行传输过程中,由于衍射作用造成中心能量聚集和光斑扩展,且由于接收望远镜次镜的阻挡和主镜接收口径有限,造成系统能量严重损耗。文中建立了双望远镜系统模型,通过控制优化出射光场的相位分布,实现了对上行传输过程中接收光场的整形,降低了衍射作用、大气湍流和系统次镜阻挡引起的系统能量损耗,提高了系统的能量耦合效率;计算了不同参数望远镜系统垂直传输10 km、30 km、50 km距离下的结果,结果表明:通过光束优化整形,系统的能量耦合效率得到了有效地提高。
The technology of laser relay mirror is a new technique that has drawn much attention in recent years. The energy coupling efficiency is one of the key factors of the relay mirror system. The relay lens system adopts the double telescope structure to realize the upward transmission and reception of the light beam. During the upward transmission of the light beam, due to the diffraction effect, the central energy accumulation and flare expansion are caused. Due to the limitation of the receiving telescope secondary lens and the receiving aperture of the main mirror, the system energy Serious loss. The binocular system model is established in this paper. By controlling and optimizing the phase distribution of the emergent light field, the shaping of the received light field in the uplink transmission is achieved, and the system energy loss caused by diffraction, atmospheric turbulence and system secondary mirror blocking is reduced and increased The energy coupling efficiency of the system was calculated. The results of the vertical transmission of 10 km, 30 km and 50 km with different parameters of the telescope were calculated. The results show that the energy coupling efficiency of the system is improved effectively by beam shaping.