Physics – Optics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989msngr..58...58d&link_type=abstract
The Messenger, vol. 58, p. 58-60
Physics
Optics
4
Fiber Optics: Echelle Spectrographs
Scientific paper
Different types of commercial fibre optics find useful application in modern astronomical instruments. ESO has been particularly interested in the use of fibres as "light pipes" to feed spectrographs at a distance from the telescope. This is the case of the Coude Echelle Spectrograph (CES) fed through a 35 m long fibre from the Cassegrain focus of the 3.6-m telescope, alternatively to the standard use with the CAT telescope. The gain one can achieve by using the larger telescope can be as large as two magnitudes over a wide spectral range and this difference opens the way to an entirely new class of observations that at the CAT would be photon limited. Obviously, would-be observers have to be aware that when the link operates, both the CAT and the 3.6-m need to be "booked". As a consequence, the OPC checks with special care whether the use of the larger collecting area is indeed absolutely necessary. A very convincing case and an outstanding scientific justification are a must for these programmes.
Avila Gerardo
D'Odorico Sandro
Molaro Paolo P.
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