Na variability and LGS elongation: impact on wavefront error
Na variability and LGS elongation: impact on wavefront error
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Na 变异性和 LGS 伸长率：对波前误差的影响
DOI：
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发表时间：
2011
期刊：
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通讯作者：
K. Jones
中科院分区：
文献类型：
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作者：
K. Jones
中间层钠的密度结构和高度变化会影响自适应光学的性能。激光导星（LGS）具有较大的入口孔径，被视为具有反映钠层密度结构的强度结构的圆柱体。这种延长将钠光扩散到更多的波前传感器（WFS）像素上，并降低了信噪比。这种效应与望远镜直径的平方成正比：TMT为30米，E-ELT为42米。研究了NA的可变性，并分析了由此产生的伸长对波前误差的影响。将比较TMT和E-ELT用于减轻LGS伸长以减少产生的波前误差的方法。
Variation in density structure and altitude of mesospheric sodium impacts the performance of Adaptive Optics (AO). With large entrance apertures, Laser Guide Stars (LGS) are seen as cylinders with an intensity structure that reflects the density structure of the sodium layers. Such elongation spreads the sodium light over more WaveFront Sensor (WFS) pixels and reduces the signal to noise ratios. This effect is proportional to the square of the telescope diameter: 30 m for TMT and 42 m for E-ELT. NA variability is examined and the resulting elongation analyzed for impact on WaveFront Error. TMT and E-ELT will be compared for methods being applied to mitigate LGS elongation to reduce resulting WaveFront Error.