Hexabundles: imaging fiber 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 Noordegraaf

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We demonstrate a novel imaging fiber bundle ("hexabundle") that is suitable for low-light applications in astronomy. The most successful survey instruments at optical-infrared wavelengths use hundreds to thousands of multimode fibers fed to one or more spectrographs. Since most celestial sources are spatially extended on the celestial sphere, a hexabundle provides spectroscopic information at many distinct locations across the source. We discuss two varieties of hexabundles: (i) lightly fused, closely packed, circular cores; (ii) heavily fused non-circular cores with higher fill fractions. In both cases, we find the important result that the cladding can be reduced to ∼2μm over the short fuse length, well below the conventional ∼10γ thickness employed more generally, with a consequent gain in fill factor. Over the coming decade, it is to be expected that fiber-based instruments will be upgraded with hexabundles in order to increase the spatial multiplex capability by two or more orders of magnitude.

LanguageEnglish
Pages2649-2661
Number of pages13
JournalOptics Express
Volume19
Issue number3
DOIs
Publication statusPublished - 31 Jan 2011
Externally publishedYes

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fibers
celestial sphere
fuses
astronomy
bundles
spectrographs
wavelengths

Cite this

Bland-Hawthorn, J., Bryant, J., Robertson, G., Gillingham, P., O'Byrne, J., Cecil, G., ... Noordegraaf, D. (2011). Hexabundles: imaging fiber arrays for low-light astronomical applications. Optics Express, 19(3), 2649-2661. https://doi.org/10.1364/OE.19.002649
Bland-Hawthorn, Joss ; Bryant, Julia ; Robertson, Gordon ; Gillingham, Peter ; O'Byrne, John ; Cecil, Gerald ; Haynes, Roger ; Croom, Scott ; Ellis, Simon ; Maack, Martin ; Skovgaard, Peter ; Noordegraaf, Danny. / Hexabundles : imaging fiber arrays for low-light astronomical applications. In: Optics Express. 2011 ; Vol. 19, No. 3. pp. 2649-2661.
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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 & Noordegraaf, D 2011, 'Hexabundles: imaging fiber arrays for low-light astronomical applications' Optics Express, vol. 19, no. 3, pp. 2649-2661. https://doi.org/10.1364/OE.19.002649

Hexabundles : imaging fiber 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; Noordegraaf, Danny.

In: Optics Express, Vol. 19, No. 3, 31.01.2011, p. 2649-2661.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Haynes,Roger

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Bland-Hawthorn J, Bryant J, Robertson G, Gillingham P, O'Byrne J, Cecil G et al. Hexabundles: imaging fiber arrays for low-light astronomical applications. Optics Express. 2011 Jan 31;19(3):2649-2661. https://doi.org/10.1364/OE.19.002649