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David Meyer

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Proceedings Article | 13 December 2020 Poster + Paper

Fiber-coupling of Fourier transform spectrographs

S. Schäfer, P. Huke, D. Meyer, A. Reiners

Proceedings Volume 11447, 114473Q (2020) https://doi.org/10.1117/12.2561599

KEYWORDS: Fourier transforms, Spectrographs, Optical fibers, Calibration, Astronomy, Iterated function systems, Light sources, Beam shaping

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Fourier Transform Spectrographs (FTS) are versatile tools for measuring accurate, high resolution spectra. They are internally calibrated by a reference laser that runs in parallel to the science light. Therefore it is crucial to properly align these two beams with respect to each other. We show how this can be achieved by feeding a part of the reference light into the optical path of the science beam. For astronomical applications it’s often useful to use optical fibers. We present a coupling setup for our Bruker Optics IFS 125 FTS, consisting of (1) two hexagonal input fibers, (2) dichroic beam-combining for measuring two light sources simultaneously and (3) optimized optics to match the original Bruker design. The hexagonal shape of the fiber cores secures sufficient mode scrambling inside the fibers, resulting in constant beam parameters and a more homogeneous illumination of the entrance aperture of the FTS.

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