Understanding incomplete scrambling in fibres: experimental investigations

U. Lemke; J. R. Allington-Smith; J. Stürmer

doi:10.1117/12.926148

13 September 2012 Understanding incomplete scrambling in fibres: experimental investigations

U. Lemke, J. R. Allington-Smith, J. Stürmer

Proceedings Volume 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II; 845035 (2012) https://doi.org/10.1117/12.926148
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Recent advances in detection and characterization of exo-planets have led to increasing standards for repeatability of spectral-line detection of novel high-resolution spectrographs. This is important for exo-planet research but also has its impact on astroseismology and the study of variable stars. For these purposes optical fibres bear a huge advantage due to their improved scrambling ability - but this is subject to fundamental limits. This investigation gives experimental support for the theoretical proposals made in a companion paper which uses a ray-tracing approach. We will concentrate on the mechanisms that cause incomplete scrambling in order to gain insight in the true nature of scrambling, unlike previous mainly phenomenological studies. We describe the experimental setup that will be used to determine the fibre response to input beam parameters like focal ratio, tilt and offset. Preliminary experimental results are consistent with the theoretical predictions made and thus motivating a further exploration of these phenomena.

Citation Download Citation

U. Lemke, J. R. Allington-Smith, and J. Stürmer "Understanding incomplete scrambling in fibres: experimental investigations", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 845035 (13 September 2012); https://doi.org/10.1117/12.926148

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KEYWORDS

Point spread functions

Spectrographs

Calibration

Geometrical optics

Near field optics

Charge-coupled devices

Light emitting diodes

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