FRD and scrambling properties of recent non-circular fibres
FRD and scrambling properties of recent non-circular fibres
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最新非圆形光纤的FRD和扰乱特性
DOI：
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发表时间：
2012
期刊：
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通讯作者：
G. Ávila
中科院分区：
文献类型：
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作者：
G. Ávila
为了提高径向速度测量的精度，人们提出了用八角形、正方形和矩形芯形的光纤代替圆形光纤，将望远镜与光谱仪连接起来。从理论上讲，它们提供了比圆形对应的更好的加扰性能。首先，商用八角形纤维提供了良好的近场扰乱增益。不幸的是，远场的混乱并没有显示出重要的数据。这篇文章展示了CeramOptec的新型纤维的测试结果。测量结果表明，远场加扰增益有了实质性的改善。此外，对它们的焦比退化(FRD)的评估表明，它们的性能比以前的纤维要好得多。
Optical fibres with octagonal, square and rectangular core shapes have been proposed as alternative to the circular fibres to link the telescopes to spectrographs in order to increase the accuracy of radial velocity measurements. Theoretically they offer better scrambling properties than their circular counterparts. First commercial octagonal fibres provided good near field scrambling gains. Unfortunately the far field scrambling did not show important figures. This article shows test results on new fibres from CeramOptec. The measurements show substantial improvements of the far field scrambling gains. In addition, evaluation of their focal ratio degradation (FRD) shows much better performances than previous fibres.