Journal Article

Modal noise prediction in fibre spectroscopy – I. Visibility and the coherent model

U. Lemke, J. Corbett, J. Allington-Smith and G. Murray

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 417, issue 1, pages 689-697
Published in print October 2011 | ISSN: 0035-8711
Published online October 2011 | e-ISSN: 1365-2966 | DOI:
Modal noise prediction in fibre spectroscopy – I. Visibility and the coherent model

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Fibre modal noise occurs in high spectral resolution, high signal-to-noise ratio applications. It imposes fundamental limits on the photometric accuracy of state-of-the-art fibre-spectrograph systems. In order to maximize the performance of current and future instruments it is therefore essential to predict fibre modal noise. To attain a predictive model we are using a dual approach, bringing theoretical assumptions in line with the experimental data obtained using a test-bench spectrograph. We show that the task of noise prediction can be reduced to determining the visibility of the modal pattern which can be measured at the detector plane. Subsequently, the visibility dependence of essential parameters is presented. This work will soon provide a basis for prediction of modal noise limitations in fibre-coupled spectrograph designs.

Keywords: line: profiles; instrumentation: spectrographs; methods: analytical; methods: laboratory; techniques: radial velocities; techniques: spectroscopic

Journal Article.  6522 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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