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Proceedings Article

GNOSIS: an OH suppression unit for near-infrared spectrographs

[+] Author Affiliations
S. C. Ellis, J. Bland-Hawthorn, J. Bryant, S. Leon-Saval, J. O'Byrne, C. Trinh

The Univ. of Sydney (Australia)

J. S. Lawrence

Anglo-Australian Observatory (Australia) and Macquarie Univ. (Australia)

R. Haynes, Hans-Gerd Löhmannsröben, W. Rambold, M. Roth

innoFSPEC (Germany)

A. Horton, S. Lee, J. Mladenoff

Anglo-Australian Observatory (Australia)

Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773516 (August 25, 2010); doi:10.1117/12.856348
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From Conference Volume 7735

  • Ground-based and Airborne Instrumentation for Astronomy III
  • Ian S. McLean; Suzanne K. Ramsay; Hideki Takami
  • San Diego, California, USA | June 27, 2010

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.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

S. C. Ellis ; J. Bland-Hawthorn ; J. S. Lawrence ; J. Bryant ; R. Haynes, et al.
"GNOSIS: an OH suppression unit for near-infrared spectrographs", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773516 (August 25, 2010); doi:10.1117/12.856348; http://dx.doi.org/10.1117/12.856348


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