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Collimated focal ratio degradation testing for highly multiplexed fiber systems—an improvement to a standard test

Daniel Finstad, Edward Wishnow, Claire Poppett, Martin Sirk, Jerry Edelstein, Steve Gibson, Geoff Marcy, and Andrew Howard

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Abstract

A simple method for determining the focal ratio degradation of optical fibers has been developed. The method involves splitting the light from the test fiber and recording ring patterns that have traveled over two different, and known, optical paths. This new method will be valuable for testing many fibers as will be needed for new multiobject astronomical spectrographs.

© 2016 Optical Society of America

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