Shack-Hartmann tomographic wavefront reconstruction using LGS: analysis of spot elongation and fratricide effect
Shack-Hartmann tomographic wavefront reconstruction using LGS: analysis of spot elongation and fratricide effect
复制标题
使用 LGS 进行 Shack-Hartmann 断层扫描波前重建：光斑伸长和误伤效应分析
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
T. Fusco
中科院分区：
文献类型：
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作者：
C. Robert;J. Conan;D. Gratadour;C. Petit;T. Fusco
在多通道层析重建分析中，必须全面考虑伸长引起的噪声效应。这样的分析允许性能的精细估计和比较发射选项。我们开发了一个模态LGS层析代码的基础上伪解析矩阵形式主义。该模态分析是计算和存储密集型的。因此，我们将模拟限制在直径范围为D = 4至21 m的缩小情况下。我们还限制了湍流层的数量，几个等效层。包括光斑伸长和瑞利散射等，当考虑全局层析重建时，边缘发射提供稍微更好的性能，并限制了可能低估散射的风险。
Noise e ects induced by elongation have to be considered globally in a multi-channel tomographic reconstruction analysis. Such an analysis allows a fine esti mation of performance and to compare launching op- tions. We developed a modal LGS tomographic code based on pseudo-analytical matrix formalism. This modal analysis is computing and memory intensive. Therefore we limit the simulation to downscaled cases with di- ameters ranging from D = 4 to 21 m. We also limit the number of turbulent layers to a few equivalent layers. Including spot elongation and Rayleigh fratricide e ect, when considering a global tomographic reconstruction, edge launching gives lightly better performance and limits the risk of possible underestimation of fratricide scatter .