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Proceedings Paper

Focal ratio degradation: a new perspective
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Paper Abstract

We have developed an alternative FRD empirical model for the parallel laser beam technique which can accommodate contributions from both scattering and modal diffusion. It is consistent with scattering inducing a Lorentzian contribution and modal diffusion inducing a Gaussian contribution. The convolution of these two functions produces a Voigt function which is shown to better simulate the observed behavior of the FRD distribution and provides a greatly improved fit over the standard Gaussian fitting approach. The Voigt model can also be used to quantify the amount of energy displaced by FRD, therefore allowing astronomical instrument scientists to identify, quantify and potentially minimize the various sources of FRD, and optimise the fiber and instrument performance.

Paper Details

Date Published: 23 July 2008
PDF: 8 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70182U (23 July 2008); doi: 10.1117/12.788735
Show Author Affiliations
Dionne M. Haynes, Macquarie Univ. (Australia)
Anglo-Australian Observatory (Australia)
Michael J. Withford, Macquarie Univ. (Australia)
Judith M. Dawes, Macquarie Univ. (Australia)
Roger Haynes, Anglo-Australian Observatory (Australia)
Joss Bland-Hawthorn, Univ. of Sydney (Australia)

Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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