Model-based calculations of fiber output fields for fiber-based spectroscopy

Eloy Hernandez; Daniel Bodenmüller; Martin M. Roth; Andreas Kelz

doi:10.1117/12.2232401

4 August 2016 Model-based calculations of fiber output fields for fiber-based spectroscopy

Eloy Hernandez, Daniel Bodenmüller, Martin M. Roth, Andreas Kelz

Proceedings Volume 9907, Optical and Infrared Interferometry and Imaging V; 990734 (2016) https://doi.org/10.1117/12.2232401
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

The accurate characterization of the field at the output of the optical fibres is of relevance for precision spectroscopy in astronomy. The modal effects of the fibre translate to the illumination of the pupil in the spectrograph and impact on the resulting point spread function (PSF). A Model is presented that is based on the Eigenmode Expansion Method (EEM) that calculates the output field from a given fibre for different manipulations of the input field. The fibre design and modes calculation are done via the commercially available Rsoft-FemSIM software. We developed a Python script to apply the EEM. Results are shown for different configuration parameters, such as spatial and angular displacements of the input field, spot size and propagation length variations, different transverse fibre geometries and different wavelengths. This work is part of the phase A study of the fibre system for MOSAIC, a proposed multi-object spectrograph for the European Extremely Large Telescope (ELT-MOS).

Citation Download Citation

Eloy Hernandez, Daniel Bodenmüller, Martin M. Roth, and Andreas Kelz "Model-based calculations of fiber output fields for fiber-based spectroscopy", Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 990734 (4 August 2016); https://doi.org/10.1117/12.2232401

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