Fiber-coupling of Fourier transform spectrographs

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

doi:10.1117/12.2561599

13 December 2020 Fiber-coupling of Fourier transform spectrographs

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

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 114473Q (2020) https://doi.org/10.1117/12.2561599
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

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.

Citation Download Citation

S. Schäfer, P. Huke, D. Meyer, and A. Reiners "Fiber-coupling of Fourier transform spectrographs", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114473Q (13 December 2020); https://doi.org/10.1117/12.2561599

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