Focal ratio degradation

a new perspective

Dionne M. Haynes, Michael J. Withford, Judith M. Dawes, Roger Haynes, Joss Bland-Hawthorn

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

11 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationAdvanced optical and mechanical technologies in telescopes and instrumentation
EditorsEli Atad-Ettedgui, Dietrich Lemke
Place of PublicationBellingham, Washington
PublisherSPIE
Pages70182U-1-70182U-8
Number of pages8
Volume7018
ISBN (Print)9780819472281
DOIs
Publication statusPublished - 2008
EventAdvanced Optical and Mechanical Technologies in Telescopes and Instrumentation - Marseille, France
Duration: 23 Jun 200828 Jun 2008

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume7018
ISSN (Print)0277-786X

Other

OtherAdvanced Optical and Mechanical Technologies in Telescopes and Instrumentation
CountryFrance
CityMarseille
Period23/06/0828/06/08

Keywords

  • Astronomical instrumentation
  • Focal ratio degradation
  • FRD
  • Optical fiber
  • Scattering
  • Surface roughness

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