单双层共轭系统的共轭高度对等晕角的影响
Effects of conjugate heights of single and dual-conjugate adaptive optics systems on isoplanatic angle
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摘要: 简要介绍了传统自适应光学系统的局限性和多层共轭自适应光学基本原理。模拟了单双层共轭校正系统的共轭高度，并结合平程与垂程(HV模型)两种传输状态对系统等晕角增益作了进一步的分析。对单层共轭系统，在20 km的传输距离内，在平程中整个区域都属于等晕角放大区，共轭高度的最佳位置在传输距离的中间（约10 km处），等晕角取极大值，增益效果较好；但垂程中增益效果变差，且等晕角放大区也仅在3.6 km之内。对双层共轭系统来说，第1层共轭高度的变形镜主要对近距离畸变波前进行校正，并对整个传输距离的等晕角影响很大，是双层共轭系统的关键因素；第2层共轭高度对远距离等晕角影响较大。Abstract: The limitation of classical adaptive optics and the basic principle of multi-conjugate adaptive optics are briefly introduced. The conjugate heights of single-conjugate and dual-conjugate systems are numerically simulated, and the gains of isoplanatic angle are demonstrated combined level-propagation and upright-propagation. The simulated results indicate that when the propagation distance is 20 km, the conjugation height has notable effect on the gain of the isoplanatic angle. For a single-conjugate system, the gain of isoplanatic angle is good in level propagation, but bad in upright, and the range of enlargement is limited during 3.6 km. For a dual-conjugate system, the deformable mirror for the first conjugate height mostly corrects the atmospheric turbulence near the pupil plane, and
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Key words:
- adaptive optics /
- single-conjugate /
- dual-conjugate /
- conjugate height /
- isoplanatic angle
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