FRD and scrambling properties of recent non-circular fibres

Gerardo Avila

doi:10.1117/12.927447

24 September 2012 FRD and scrambling properties of recent non-circular fibres

Gerardo Avila

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 84469L (2012) https://doi.org/10.1117/12.927447
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Optical fibres with octagonal, square and rectangular core shapes have been proposed as alternative to the circular fibres to link the telescopes to spectrographs in order to increase the accuracy of radial velocity measurements. Theoretically they offer better scrambling properties than their circular counterparts. First commercial octagonal fibres provided good near field scrambling gains. Unfortunately the far field scrambling did not show important figures. This article shows test results on new fibres from CeramOptec. The measurements show substantial improvements of the far field scrambling gains. In addition, evaluation of their focal ratio degradation (FRD) shows much better performances than previous fibres.

Citation Download Citation

Gerardo Avila "FRD and scrambling properties of recent non-circular fibres", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84469L (24 September 2012); https://doi.org/10.1117/12.927447

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