GNOSIS: a novel near-infrared OH suppression unit at the AAT

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. RothB. Schmidt, K. Shortridge, S. Smedley, C. G. Tinney, P. Xavier, J. Zheng

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

    7 Citations (Scopus)


    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.

    Original languageEnglish
    Title of host publicationGround-based and Airborne Instrumentation for Astronomy IV
    EditorsIan S. McLean, Suzanne K. Ramsay, Hideki Takami
    Place of PublicationBellingham, Washington
    Number of pages9
    ISBN (Print)9780819491473
    Publication statusPublished - 2012
    EventGround-Based and Airborne Instrumentation for Astronomy IV - Amsterdam, Netherlands
    Duration: 1 Jul 20126 Jul 2012

    Publication series

    NameProceedings of SPIE
    ISSN (Print)0277-786X


    OtherGround-Based and Airborne Instrumentation for Astronomy IV


    • Astrophotonics
    • Fiber Bragg gratings
    • Near-infrared
    • OH suppression
    • Photonic lantern


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