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首页> 外文期刊>Journal of the Optical Society of America, A. Optics, image science, and vision >Impact of sodium laser guide star fratricide on multi-conjugate adaptive optics systems
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Impact of sodium laser guide star fratricide on multi-conjugate adaptive optics systems

机译：钠激光导星杀伤剂对多共轭自适应光学系统的影响

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摘要

Laser beams projected from the ground to form sodium layer laser guide stars (LGSs) for adaptive optics (AO) systems experience scattering and absorption that reduce their intensity as they propagate upward through the atmosphere. Some fraction of the scattered light will be collected by the other wavefront sensors and causes additional background in parts of the pupil. This cross-talk between different LGS wavefront sensors is referred to as the fratricide effect. In this paper we quantify the magnitude of four different sources of scattering/absorption and backscattering, and we evaluate their impact on performance with various zenith angles and turbulence profiles for one particular AO system. The resulting wavefront error for the Thirty Meter Telescope (TMT) multi-conjugate AO (MCAO) system, NFIRAOS, is on the order of 5 to 20 nm RMS, provided that the mean background from the fratricide effect can be calibrated and subtracted with an accuracy of 80percent. We also present the impact on system performance of momentary variations in LGS signal levels due to variations in cirrus absorption or laser power, and we show that this affects the performance more than does an equal variation in the level of the fratricide.
机译：从地面投射出的激光束会形成用于自适应光学（AO）系统的钠层激光导星（LGS），其散射和吸收会随着其向上传播穿过大气而降低其强度。散射光的一部分会被其他波阵面传感器收集，并在瞳孔的某些部分引起额外的背景。不同LGS波前传感器之间的这种串扰称为“杀伤效应”。在本文中，我们量化了四种不同的散射/吸收和反向散射源的大小，并针对一个特定的AO系统评估了它们在各种天顶角和湍流剖面下对性能的影响。三十米望远镜（TMT）多共轭AO（MCAO）系统NFIRAOS产生的波前误差约为5至20 nm RMS，前提是可以校准杀伤效应的平均背景，并用精度为80％。我们还介绍了由于卷云吸收或激光功率的变化而引起的LGS信号电平瞬时变化对系统性能的影响，并且我们发现，与杀人水平相同的变化相比，这对性能的影响更大。

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