Abstract
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 language | English |
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Title of host publication | Ground-based and Airborne Instrumentation for Astronomy IV |
Editors | Ian S. McLean, Suzanne K. Ramsay, Hideki Takami |
Place of Publication | Bellingham, Washington |
Publisher | SPIE |
Pages | 1-9 |
Number of pages | 9 |
ISBN (Print) | 9780819491473 |
DOIs | |
Publication status | Published - 2012 |
Event | Ground-Based and Airborne Instrumentation for Astronomy IV - Amsterdam, Netherlands Duration: 1 Jul 2012 → 6 Jul 2012 |
Publication series
Name | Proceedings of SPIE |
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Publisher | SPIE |
Volume | 8446 |
ISSN (Print) | 0277-786X |
Other
Other | Ground-Based and Airborne Instrumentation for Astronomy IV |
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Country | Netherlands |
City | Amsterdam |
Period | 1/07/12 → 6/07/12 |
Keywords
- Astrophotonics
- Fiber Bragg gratings
- Near-infrared
- OH suppression
- Photonic lantern