瑞利导星发射系统设计

发布时间：2018-07-14 20:56

【摘要】：在天文观测中,瑞利激光导星自适应光学系统可以补偿大气湍流对成像的影响,并且提高天空覆盖率。能够发射一颗合格的瑞利导星成为该技术的前提。为了实现瑞利激光导星在天文观测中的应用,设计了一套瑞利导星发射系统。首先,根据瑞利激光导星自适应系统的基本要求,介绍了激光器的脉冲能量与重复频率的影响;接着,根据湍流理论分析了发射系统的最佳发射口径与大气湍流对导星的光斑大小的影响;然后,根据发射要求利用Zemax软件设计出一套瑞利导星发射系统。该系统最佳的发射口径为260 mm,采样层为10~11 km,导星最佳聚焦高度为9.8 km,理想的导星光斑半径为0.45″,存在大气湍流情况下导星光斑半径小于1″;最后利用Zemax软件对该系统进行公差分析,分析结果表明该系统相对较容易地实现加工与装调。该发射系统满足激光导星自适应系统的要求,实用性高,设计方法普适。
[Abstract]:In astronomical observation Rayleigh laser guide star adaptive optical system can compensate for the influence of atmospheric turbulence on imaging and increase sky coverage. The ability to launch a qualified Rayleigh guide star is a prerequisite for this technology. In order to realize the application of Rayleigh laser guide star in astronomical observation, a Rayleigh guide star launching system is designed. Firstly, according to the basic requirements of Rayleigh laser guide star adaptive system, the effects of laser pulse energy and repetition rate are introduced. According to the turbulence theory, the influence of the optimal emission aperture of the emission system and the atmospheric turbulence on the light spot size of the guide star is analyzed, and then, according to the emission requirements, a Rayleigh guide star emission system is designed by using Zemax software. The optimum emission aperture of the system is 260 mm, the sampling layer is 10 ~ 11 km, the optimum focusing height of the guide star is 9.8 km, the ideal radius of the guide spot is 0.45 ", and the radius of the spot is less than 1" in the presence of atmospheric turbulence. Finally, the tolerance analysis of the system is carried out by using Zemax software. The results show that the system is relatively easy to process and adjust. The system meets the requirements of the laser guide star adaptive system, high practicability and universal design method.
【作者单位】：中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室;中国科学院大学;
【基金】：国家自然科学基金(11174274,11174279)
【分类号】：P111

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