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Proceedings Paper

GNOSIS: an OH suppression unit for near-infrared spectrographs
Author(s): S. C. Ellis; J. Bland-Hawthorn; J. S. Lawrence; J. Bryant; R. Haynes; A. Horton; S. Lee; S. Leon-Saval; Hans-Gerd Löhmannsröben; J. Mladenoff; J. O'Byrne; W. Rambold; M. Roth; C. Trinh
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Paper Abstract

GNOSIS is an OH suppression unit to be used in conjunction with existing spectrographs. The OH suppression is achieved using fibre Bragg gratings (FBGs), and will deliver the darkest near-infrared background of any ground-based instrument. Laboratory and on-sky tests demonstrate that FBGs can suppress OH lines by 30dB whilst maintaing > 90% throughput between the lines, resulting in a 4 mag decrease in the background. In the first implementation GNOSIS will feed IRIS2 on the AAT. It will consist of a seven element lenslet array, covering 1.4" on the sky, and will suppress the 103 brightest OH lines between 1.47 and 1.70 μm. Future upgrades will include J-band suppression and implementation on an 8m telescope.

Paper Details

Date Published: 25 August 2010
PDF: 10 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773516 (25 August 2010); doi: 10.1117/12.856348
Show Author Affiliations
S. C. Ellis, The Univ. of Sydney (Australia)
J. Bland-Hawthorn, The Univ. of Sydney (Australia)
J. S. Lawrence, Anglo-Australian Observatory (Australia)
Macquarie Univ. (Australia)
J. Bryant, The Univ. of Sydney (Australia)
R. Haynes, innoFSPEC (Germany)
A. Horton, Anglo-Australian Observatory (Australia)
S. Lee, Anglo-Australian Observatory (Australia)
S. Leon-Saval, The Univ. of Sydney (Australia)
Hans-Gerd Löhmannsröben, innoFSPEC (Germany)
J. Mladenoff, Anglo-Australian Observatory (Australia)
J. O'Byrne, The Univ. of Sydney (Australia)
W. Rambold, innoFSPEC (Germany)
M. Roth, innoFSPEC (Germany)
C. Trinh, The Univ. of Sydney (Australia)

Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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