VELOCE’s novel IFU-fitted fibre feed

Scott Case; Vladimir Churilov; Ross Zhelem; Anthony Horton; Jon Lawrence; Michael Edgar; Tony Farrell; Lewis Waller; Yevgen Kripak; Doug Gray; Christopher Ramage; Steve Lee; Mike Ireland; Christian Schwab; Chris Tinney

doi:10.1117/12.2312939

6 July 2018 VELOCE’s novel IFU-fitted fibre feed

Scott Case, Vladimir Churilov, Ross Zhelem, Anthony Horton, Jon Lawrence, Michael Edgar, Tony Farrell, Lewis Waller, Yevgen Kripak, Doug Gray, Christopher Ramage, Steve Lee, Mike Ireland, Christian Schwab, Chris Tinney

Author Affiliations +

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 107026E (2018) https://doi.org/10.1117/12.2312939
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

VELOCE is an IFU fibre feed and spectrograph for the AAT that is replacing CYCLOPS2. It is being constructed by the AAO and ANU. In this paper we discuss the design and engineering of the IFU/fibre feed components of the cable. We discuss the mode scrambling gain obtained with octagonal core fibres and how these octagonal core fibres should be spliced to regular circular core fibres to ensure maximum throughput for the cable using specialised splicing techniques. In addition we also describe a new approach to manufacturing a precision 1D/2D array of optical fibres for some applications in IFU manufacture and slit manufacture using 3D printed fused silica substrates, allowing for a cheap substitute to expensive lithographic etching in silicon at the expense of positional accuracy. We also discuss the Menlo Systems laser comb which employs endlessly-singlemode fibre to eliminate modal noise associated with multimode fibre transmission to provide the VELOCE spectrograph with a stable and repeatable source of wavelength calibration lines.

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Scott Case, Vladimir Churilov, Ross Zhelem, Anthony Horton, Jon Lawrence, Michael Edgar, Tony Farrell, Lewis Waller, Yevgen Kripak, Doug Gray, Christopher Ramage, Steve Lee, Mike Ireland, Christian Schwab, and Chris Tinney "VELOCE’s novel IFU-fitted fibre feed", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107026E (6 July 2018); https://doi.org/10.1117/12.2312939

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KEYWORDS

Spectrographs

Calibration

Telescopes

Beam splitters

Optical fibers

Manufacturing

Microlens array

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