Hexabundles: imaging fibre arrays for low-light astronomical applications

Publication: Research - peer-reviewConference article – Annual report year: 2010

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We demonstrate for the first time an imaging fibre bundle (“hexabundle”) that is suitable for low-light applications in astronomy. The most successful survey instruments at optical-infrared wavelengths today have obtained data on up to a million celestial sources using hundreds of multimode fibres at a time fed to multiple spectrographs. But a large fraction of these sources are spatially extended on the celestial sphere such that a hexabundle would be able to provide spectroscopic information at many distinct locations across the source. Our goal is to upgrade single-fibre survey instruments with multimode hexabundles in place of the multimode fibres. We discuss two varieties of hexabundles: (i) closely packed circular cores allowing the covering fraction to approach the theoretical maximum of 91%; (ii) fused noncircular cores where the interstitial holes have been removed and the covering fraction approaches 100%. In both cases, we find that the cladding can be reduced to ~2μm over the short fuse length, well below the conventional ~10λ thickness employed more generally. We discuss the relative merits of fused/unfused hexabundles in terms of manufacture and deployment, and present our first on-sky observations.
Original languageEnglish
JournalProceedings of SPIE, the International Society for Optical Engineering
Publication date2010
Volume7735
ISSN0277-786X
DOIs
StatePublished

Conference

ConferenceGround-based and Airborne Instrumentation for Astronomy III
CitySan Diego, CA, USA
Period01/01/10 → …
CitationsWeb of Science® Times Cited: 1

Keywords

  • astronomical instrumentation, multimode fibre, integral field spectrograph, galaxy surveys
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