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24 September 2012 GNOSIS: a novel near-infrared OH suppression unit at the AAT
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GNOSIS has provided the first on-telescope demonstration of a concept to utilize complex aperioidc fiber Bragg gratings to suppress the 103 brightest atmospheric hydroxyl emission doublets between 1.47-1.7 μm. The unit is designed to be used at the 3.9-meter Anglo-Australian Telescope (AAT) feeding the IRIS2 spectrograph. Unlike previous atmospheric suppression techniques GNOSIS suppresses the lines before dispersion. We present the results of laboratory and on-sky tests from instrument commissioning. These tests reveal excellent suppression performance by the gratings and high inter-notch throughput, which combine to produce high fidelity OH-free spectra.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
C. Q. Trinh, S. C. Ellis, J. S. Lawrence, A. J. Horton, J. Bland-Hawthorn, S. G. Leon-Saval, J. Bryant, S. Case, M. Colless, W. Couch, K. Freeman, L. Gers, K. Glazebrook, R. Haynes, S. Lee, H.-G. Löhmannsröben, S. Miziarski, J. O'Byrne, W. Rambold, M. M. Roth, B. Schmidt, K. Shortridge, S. Smedley, C. G. Tinney, P. Xavier, and J. Zheng "GNOSIS: a novel near-infrared OH suppression unit at the AAT", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84463J (24 September 2012); doi: 10.1117/12.926483;

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