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Proceedings Paper

Photometrical scrambling gain and focal ratio degradation in fibers for astronomical instruments
Author(s): Gerardo Avila; Paul Singh; Maja Albertsen
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Paper Abstract

Optical fibres with extreme optical scrambling gains are required when used to link telescopes to spectrographs for the measurement of very high accuracy radial velocities. We started to study systematically the scrambling properties of optical fibres and in particular, the new FBP fibres from Polymicro and the high numerical aperture fibres from Crystal Fibre. The gain in photometrical scrambling by mechanical fibre scramblers is shown. The degradation of the focal ratio by these fibres is also reported. Finally, we present the first evaluation of a slit light pipe to homogenize the flux of several fibres arranged on a line in order to get a uniform slit aperture.

Paper Details

Date Published: 27 June 2006
PDF: 9 pages
Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62695O (27 June 2006); doi: 10.1117/12.671417
Show Author Affiliations
Gerardo Avila, European Southern Observatory (Germany)
Paul Singh, European Southern Observatory (Germany)
Maja Albertsen, Ibsen Photonics A/S (Denmark)

Published in SPIE Proceedings Vol. 6269:
Ground-based and Airborne Instrumentation for Astronomy
Ian S. McLean; Masanori Iye, Editor(s)

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