GNOSIS: an OH suppression unit for near-infrared spectrographs

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

doi:10.1117/12.856348

25 August 2010 GNOSIS: an OH suppression unit for near-infrared spectrographs

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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Proceedings Volume 7735, Ground-based and Airborne Instrumentation for Astronomy III; 773516 (2010) https://doi.org/10.1117/12.856348
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

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.

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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, and C. Trinh "GNOSIS: an OH suppression unit for near-infrared spectrographs", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773516 (25 August 2010); https://doi.org/10.1117/12.856348

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