
Proceedings Paper
Optical fibers for precise radial velocities: an updateFormat | Member Price | Non-Member Price |
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Paper Abstract
For the PRV instrument using simultaneous calibration technique such as with sources like thorium lamps, Fabry Perot
Etalons or laser comb, it is essential that the instrument stays stable between the wavelength calibration frame and the
actual scientific measurement. These instruments are usually in pressure and temperature controlled environments for
example under vacuum. However this is not sufficient to reach the instrumental stability required to get to precision level
of the ms-1 and below required to build the next generation PRV instruments. Another requirement is an as constant as
possible illumination of the spectrograph to stabilize the line profile of the instrument. To achieve this, it is necessary to use
a device that will scramble the light coming from the star to mitigate the effects of the atmosphere. In addition this device
should not increase significantly the beam etendue, which is already a technological challenge for large telescopes. The
common solution to this problem is to use optical fibers. Historically the solution has been to use circular fibers as they
were the only one available. Recently for other purposes non-circular fibers have been developed and made available. They
have been tested, and present an important improvement in the scrambling over the circular fibers. We will present in
this paper the properties of the octagonal fibers used for the HARPS-N2 instrument and the achieved performance of its
fiber train.
Paper Details
Date Published: 13 September 2012
PDF: 9 pages
Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 845013 (13 September 2012); doi: 10.1117/12.926188
Published in SPIE Proceedings Vol. 8450:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Ramón Navarro; Colin R. Cunningham; Eric Prieto, Editor(s)
PDF: 9 pages
Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 845013 (13 September 2012); doi: 10.1117/12.926188
Show Author Affiliations
Bruno Chazelas, Observatory of Geneva, Univ. of Geneva (Switzerland)
Francesco Pepe, Observatory of Geneva, Univ. of Geneva (Switzerland)
Francesco Pepe, Observatory of Geneva, Univ. of Geneva (Switzerland)
François Wildi, Observatory of Geneva, Univ. of Geneva (Switzerland)
Published in SPIE Proceedings Vol. 8450:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Ramón Navarro; Colin R. Cunningham; Eric Prieto, Editor(s)
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