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. Roth & 6 others B. 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 contribution

6 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

Cite this

Trinh, C. Q., Ellis, S. C., Lawrence, J. S., Horton, A. J., Bland-Hawthorn, J., Leon-Saval, S. G., ... Zheng, J. (2012). GNOSIS: a novel near-infrared OH suppression unit at the AAT. In I. S. McLean, S. K. Ramsay, & H. Takami (Eds.), Ground-based and Airborne Instrumentation for Astronomy IV (pp. 1-9). [84463J] (Proceedings of SPIE; Vol. 8446). Bellingham, Washington: SPIE.