Statistical Test of Optical Fibers for use in PMAS, the Potsdam Multi-Aperture Spectrophotometer

Details Statistical Test of Optical Fibers for use in PMAS, the Potsdam Multi-Aperture Spectrophotometer Statistical Test of Optical Fibers for use in PMAS, the Potsdam Multi-Aperture Spectrophotometer

2003-04-15

arxiv.org/abs/astro-ph/0304288v1

Astronomy and Astrophysics

Astrophysics

14 pages, 19 figures. Accepted for publication by PASP, IP02-129, for July 2003

Scientific paper

10.1086/375696

Focal ratio degradation measurements of optical fibers for the PMAS integral field instrument have been performed using the Photometric Testbench of the Potsdam Astrophysical Institute (AIP). An effort has been made to obtain sufficiently large statistical samples of individual fiber measurements. The optimization of the measurement process has made it possible to study quantitatively the effects of different coupling methods (air--glass vs.\ immersion) and of imperfections like defocus, lateral displacement, and angular misalignment. Furthermore, the effects of mechanical stress on focal ratio degradation have been investigated, confirming the presumed cause of modal noise which is known to limit the maximum signal-to-noise one can achieve with fiber-coupled echelle spectrographs.

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