22 July 2016 Optimal non-circular fiber geometries for image scrambling in high-resolution spectrographs
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Abstract
Optical fibers are a key component for high-resolution spectrographs to attain high precision in radial velocity measurements. We present a custom fiber with a novel core geometry - a 'D'-shape. From a theoretical standpoint, such a fiber should provide superior scrambling and modal noise mitigation, since unlike the commonly used circular and polygonal fiber cross sections, it shows chaotic scrambling. We report on the fabrication process of a test fiber and compare the optical properties, scrambling performance, and modal noise behaviour of the D-fiber with those of common polygonal fibers.
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Julian Stürmer, Julian Stürmer, Christian Schwab, Christian Schwab, Stephan Grimm, Stephan Grimm, André Kalide, André Kalide, Adam P. Sutherland, Adam P. Sutherland, Andreas Seifahrt, Andreas Seifahrt, Kay Schuster, Kay Schuster, Jacob L. Bean, Jacob L. Bean, Andreas Quirrenbach, Andreas Quirrenbach, "Optimal non-circular fiber geometries for image scrambling in high-resolution spectrographs", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99121T (22 July 2016); doi: 10.1117/12.2234552; https://doi.org/10.1117/12.2234552
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