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Mode expansion theory and application in step-index multimode fibres for astronomical spectroscopy

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arxiv 2105.00945 v2 pith:HUWJ2MSK submitted 2021-05-03 astro-ph.IM

E. Hernandez (1) , M. M. Roth (1) , K. Petermann (2) , A. Kelz (1) , B. Moralejo (1) , K. Madhav (1) ((1) Leibniz Institut für Astrophysik Potsdam (AIP) , (2) Technische Universität Berlin) This is my paper
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keywords fibresastronomicaleffectsmodelopticalspectrographspectroscopystability
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In astronomical spectroscopy, optical fibres are abundantly used for multiplexing and decoupling the spectrograph from the telescope to provide stability in a controlled environment. However, fibres are less than perfect optical components and introduce complex effects that diminish the overall throughput, efficiency, and stability of the instrument. We present a novel numerical field propagation model that emulates the effects of modal noise, scrambling, and focal ratio degradation with a rigorous treatment of wave optics. We demonstrate that the simulation of the near- and far-field output of a fiber, injected into a ray-tracing model of the spectrograph, allows to assess performance at the detector level.

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