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Development of the single-mode fiber integral field unit for the RHEA Spectrograph

Rains, Adam D. and Ireland, Michael J. and Jovanovic, Nemanja and Bento, Joao and Feger, Tobias and Lozi, Julien and Schwab, Christian and Coutts, David W. and Guyon, Olivier and Arriola, Alexander and Gross, Simon and Harris, Jonathan E. (2018) Development of the single-mode fiber integral field unit for the RHEA Spectrograph. In: Ground-based and Airborne Instrumentation for Astronomy VII. Proceedings of SPIE. No.10702. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 107025J. ISBN 9781510619579.

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RHEA is a single-mode échelle spectrograph designed to be a replicable and cost effective method of undertaking precision radial velocity measurements. The instrument has a novel fiber feed with an integral field unit injecting into a grid of single-mode fibers reformatted to form a pseudo-slit, increasing throughput and enabling highspatial resolution observations when operating behind Subaru and the SCExAO adaptive optics system. The past 18 months have seen a replacement cable constructed for the instrument to address modal noise caused by closely packed fibers with similar path lengths. Here we detail the cable fabrication procedure, design improvements, increased precision in meeting the required sub-micron optical tolerances, throughput gains, and known remaining issues.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Ireland, Michael J.0000-0002-6194-043X
Lozi, Julien0000-0002-3047-1845
Schwab, Christian0000-0002-4046-987X
Guyon, Olivier0000-0002-1097-9908
Gross, Simon0000-0001-5130-183X
Additional Information:© 2018 Society of Photo-optical Instrumentation Engineers (SPIE). This work was partially funded by the Australian Research Council Discovery Project DP120103751. We would like to thank Macquarie Engineering and Technical Services (METS) and the RSAA Manufacturing Workshop for their work in machining parts to complete the spectrograph assembly. Furthermore we thank Dr Benjamin Johnston, Dr Martin Ams and Alex Stokes from OptoFab for their assistance in constructing the fiber cable used for RHEA@Subaru, as well as OptoFab for use of the Nanosecond Laser Micro-Fabrication Facility, and Optical Device Characterisation Suite. ADR acknowledges support from the Australian Government Research Training Program, and the RSAA top up scholarship. We would like to thank the Subaru Telescope and the National Astronomical Observatory of Japan for granting us the opportunity to undertake this project and for their continued assistance throughout. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
Funding AgencyGrant Number
Australian Research CouncilDP120103751
Australian Government Research Training ProgramUNSPECIFIED
Subject Keywords:spectrograph, radial velocity, optical fibers, fiber injection, diffraction-limited spectrograph, high resolution, integral field unit
Series Name:Proceedings of SPIE
Issue or Number:10702
Record Number:CaltechAUTHORS:20190108-094225132
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Official Citation:Adam D. Rains, Michael J. Ireland, Nemanja Jovanovic, Joao Bento, Tobias Feger, Julien Lozi, Christian Schwab, David W. Coutts, Olivier Guyon, Alexander Arriola, Simon Gross, Jonathan E. Harris, "Development of the single-mode fiber integral field unit for the RHEA Spectrograph," Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107025J (6 July 2018); doi: 10.1117/12.2314336
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92131
Deposited By: Tony Diaz
Deposited On:08 Jan 2019 21:07
Last Modified:16 Nov 2021 03:47

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