Hexabundles: imaging fibre arrays for low-light astronomical applications

Joss Bland-Hawthorn, Julia Bryant, Gordon Robertson, Peter Gillingham, John O'Byrne, Gerald Cecil, Roger Haynes, Scott Croom, Simon Ellis, Martin Maack, Peter Skovgaard, Danny Noordegraf

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionResearchpeer-review

Abstract

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.

LanguageEnglish
Title of host publicationGround-Based and Airborne Instrumentation for Astronomy III
EditorsIan S. McLean, Suzanne K. Ramsay, Hideki Takami
PublisherSPIE
Pages1-12
Number of pages12
Volume7735
EditionPART 1
ISBN (Electronic)9780819482259
DOIs
Publication statusPublished - 12 Nov 2010
Externally publishedYes
EventGround-Based and Airborne Instrumentation for Astronomy III - San Diego, CA, United States
Duration: 27 Jun 20102 Jul 2010

Conference

ConferenceGround-Based and Airborne Instrumentation for Astronomy III
CountryUnited States
CitySan Diego, CA
Period27/06/102/07/10

Fingerprint

Multimode fibers
Multimode Fiber
Imaging
Fiber
Imaging techniques
Spectrographs
fibers
Fibers
Astronomy
Electric fuses
Covering
coverings
Fiber Bundle
celestial sphere
Spectrograph
Infrared radiation
Wavelength
fuses
Infrared
astronomy

Cite this

Bland-Hawthorn, J., Bryant, J., Robertson, G., Gillingham, P., O'Byrne, J., Cecil, G., ... Noordegraf, D. (2010). Hexabundles: imaging fibre arrays for low-light astronomical applications. In I. S. McLean, S. K. Ramsay, & H. Takami (Eds.), Ground-Based and Airborne Instrumentation for Astronomy III (PART 1 ed., Vol. 7735, pp. 1-12). [773541] SPIE. https://doi.org/10.1117/12.856345
Bland-Hawthorn, Joss ; Bryant, Julia ; Robertson, Gordon ; Gillingham, Peter ; O'Byrne, John ; Cecil, Gerald ; Haynes, Roger ; Croom, Scott ; Ellis, Simon ; Maack, Martin ; Skovgaard, Peter ; Noordegraf, Danny. / Hexabundles : imaging fibre arrays for low-light astronomical applications. Ground-Based and Airborne Instrumentation for Astronomy III. editor / Ian S. McLean ; Suzanne K. Ramsay ; Hideki Takami. Vol. 7735 PART 1. ed. SPIE, 2010. pp. 1-12
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abstract = "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.",
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Bland-Hawthorn, J, Bryant, J, Robertson, G, Gillingham, P, O'Byrne, J, Cecil, G, Haynes, R, Croom, S, Ellis, S, Maack, M, Skovgaard, P & Noordegraf, D 2010, Hexabundles: imaging fibre arrays for low-light astronomical applications. in IS McLean, SK Ramsay & H Takami (eds), Ground-Based and Airborne Instrumentation for Astronomy III. PART 1 edn, vol. 7735, 773541, SPIE, pp. 1-12, Ground-Based and Airborne Instrumentation for Astronomy III, San Diego, CA, United States, 27/06/10. https://doi.org/10.1117/12.856345

Hexabundles : imaging fibre arrays for low-light astronomical applications. / Bland-Hawthorn, Joss; Bryant, Julia; Robertson, Gordon; Gillingham, Peter; O'Byrne, John; Cecil, Gerald; Haynes, Roger; Croom, Scott; Ellis, Simon; Maack, Martin; Skovgaard, Peter; Noordegraf, Danny.

Ground-Based and Airborne Instrumentation for Astronomy III. ed. / Ian S. McLean; Suzanne K. Ramsay; Hideki Takami. Vol. 7735 PART 1. ed. SPIE, 2010. p. 1-12 773541.

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionResearchpeer-review

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AU - Bland-Hawthorn,Joss

AU - Bryant,Julia

AU - Robertson,Gordon

AU - Gillingham,Peter

AU - O'Byrne,John

AU - Cecil,Gerald

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AU - Croom,Scott

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N2 - 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.

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BT - Ground-Based and Airborne Instrumentation for Astronomy III

PB - SPIE

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Bland-Hawthorn J, Bryant J, Robertson G, Gillingham P, O'Byrne J, Cecil G et al. Hexabundles: imaging fibre arrays for low-light astronomical applications. In McLean IS, Ramsay SK, Takami H, editors, Ground-Based and Airborne Instrumentation for Astronomy III. PART 1 ed. Vol. 7735. SPIE. 2010. p. 1-12. 773541 https://doi.org/10.1117/12.856345