Journal Article

Fibre Bragg gratings for high spectral and temporal resolution astronomical observations

Geraldine Mariën, Nemanja Jovanović, Nick Cvetojević, Robert Williams, Roger Haynes, Jon Lawrence, Quentin Parker and Michael J. Withford

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 4, pages 3641-3648
Published in print April 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20592.x
Fibre Bragg gratings for high spectral and temporal resolution astronomical observations

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Dynamic spectral analysis of astronomical events has the potential to deliver the information needed to clarify or complete important theoretical descriptions of astronomical phenomena. There is currently a lack of detailed sub‐minute observations due to limitations in instruments and detectors. Here, we present an investigation into the feasibility of using fibre Bragg gratings (FBGs) as single‐line spectral filters specifically for temporal spectral astronomy, attaining both a high spectral and fast temporal resolution simultaneously. We present the device concept and discuss it in the context of two readily available FBG profiles. We demonstrate that this instrument concept could resolve spectral shifts down to 0.02 nm (3.9 km s−1) with sub‐second temporal resolution on a 4‐m class telescope, which is far superior to existing techniques that attain resolutions of 0.05 nm over several minutes.

Keywords: instrumentation: miscellaneous; instrumentation: photometers; instrumentation: spectrographs; stars: variables: general

Journal Article.  5644 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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