Characterizing octagonal and rectangular fibers for MAROON-X

Adam P. Sutherland; Julian Stuermer; Katrina R. Miller; Andreas Seifahrt; Jacob L. Bean

doi:10.1117/12.2231707

22 July 2016 Characterizing octagonal and rectangular fibers for MAROON-X

Adam P. Sutherland, Julian Stuermer, Katrina R. Miller, Andreas Seifahrt, Jacob L. Bean

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 99125C (2016) https://doi.org/10.1117/12.2231707
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

We report on the scrambling performance and focal-ratio-degradation (FRD) of various octagonal and rectangular fibers considered for MAROON-X. Our measurements demonstrate the detrimental effect of thin claddings on the FRD of octagonal and rectangular fibers and that stress induced at the connectors can further increase the FRD. We find that fibers with a thick, round cladding show low FRD. We further demonstrate that the scrambling behavior of non-circular fibers is often complex and introduce a new metric to fully capture non-linear scrambling performance, leading to much lower scrambling gain values than are typically reported in the literature (≤1000 compared to 10,000 or more). We find that scrambling gain measurements for small-core, non-circular fibers are often speckle dominated if the fiber is not agitated.

Citation Download Citation

Adam P. Sutherland, Julian Stuermer, Katrina R. Miller, Andreas Seifahrt, and Jacob L. Bean "Characterizing octagonal and rectangular fibers for MAROON-X", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99125C (22 July 2016); https://doi.org/10.1117/12.2231707

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