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首页> 外文期刊>Publications of the Astronomical Society of the Pacific >A Hybrid Pulsed Rayleigh-sodium Laser Guide Star Adaptive Optics System for Strong Turbulence Observations
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A Hybrid Pulsed Rayleigh-sodium Laser Guide Star Adaptive Optics System for Strong Turbulence Observations

机译：一种混合脉冲瑞利 - 钠激光导向星自适应光学系统，用于强大的湍流观测

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摘要

Sodium laser guide star (LGS) adaptive optics (AO) systems have become highly productive tools for all-sky astronomical observations with large telescopes. However, the performance of these systems is limited by the brightness of the sodium LGS and the number of wavefront sensor subapertures used during strong atmospheric turbulence. We propose a hybrid pulsed Rayleigh-sodium LGS AO system that exhibits an improved Strehl ratio of 55% to eliminate the effects of partial wavefront sampling for limited sodium LGS brightness in K-band. This technique uses the Rayleigh scattering signal, a byproduct of pulsed sodium LGS, with temporal-gating approach. This system comprises a Rayleigh LGS to direct light toward the wavefront sensor under a wide variety of atmospheric conditions. The Rayleigh beacon provides high-order corrections to the low-altitude layers. Any remaining distortions from higher layers typically exist on a much larger scale, which can be sampled with comparatively larger subapertures. This approach could improve the performance of large optics-infrared telescopes equipped with hybrid Rayleigh-sodium LGS AO systems during strong turbulence events.
机译：激光导向星（LGS）自适应光学（AO）系统已成为具有大型望远镜的全天天文观测的高生产力工具。然而，这些系统的性能受到LGS亮度的限制和在强大的大气湍流期间使用的波前传感器亚峰的数量。我们提出了一种杂交脉冲瑞利钠LGS AO系统，其具有55％的改善的刻度比，以消除k波段中LGS LGS亮度的部分波前采样的影响。该技术使用瑞利散射信号，脉冲钠LGS的副产物，具有时间门控方法。该系统包括瑞利LG，以在各种大气条件下将光朝向波前传感器引导。 Rayleigh Beacon向低空层提供高阶校正。来自较高层的任何剩余扭曲通常都存在于更大的尺度上，这可以用相对较大的子孔来进行采样。这种方法可以改善在强大的湍流事件期间装有杂交瑞利钠LGS AO系统的大​​型光学红外望远镜的性能。

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