S. C. Ellis, S. Bauer, C. Bacigalupo, J. Bland-Hawthorn, J. J. Bryant, S. Case, R. Content, T. Fechner, D. Giannone, R. Haynes, E. Hernandez, A. J. Horton, U. Klauser, J. S. Lawrence, S. G. Leon-Saval, E. Lindley, Hans-Gerd Löhmannsröben, S. -S. Min, N. Pai, M. Roth, K. Shortridge, L. Waller, Pascal Xavier, Ross Zhelem
- The problem of atmospheric emission from OH molecules is a long standing problem for near-infrared astronomy. PRAXIS is a unique spectrograph which is fed by fibres that remove the OH background and is optimised specifically to benefit from OH-Suppression. The OH suppression is achieved with fibre Bragg gratings, which were tested successfully on the GNOSIS instrument. PRAXIS uses the same fibre Bragg gratings as GNOSIS in its first implementation, and will exploit new, cheaper and more efficient, multicore fibre Bragg gratings in the second implementation. The OH lines are suppressed by a factor of similar to 1000, and the expected increase in the signal-to-noise in the interline regions compared to GNOSIS is a factor of similar to 9 with the GNOSIS gratings and a factor of similar to 17 with the new gratings. PRAXIS will enable the full exploitation of OH suppression for the first time, which was not achieved by GNOSIS (a retrofit to an existing instrument that was not OH-Suppression optimised) due to high thermal emission, lowThe problem of atmospheric emission from OH molecules is a long standing problem for near-infrared astronomy. PRAXIS is a unique spectrograph which is fed by fibres that remove the OH background and is optimised specifically to benefit from OH-Suppression. The OH suppression is achieved with fibre Bragg gratings, which were tested successfully on the GNOSIS instrument. PRAXIS uses the same fibre Bragg gratings as GNOSIS in its first implementation, and will exploit new, cheaper and more efficient, multicore fibre Bragg gratings in the second implementation. The OH lines are suppressed by a factor of similar to 1000, and the expected increase in the signal-to-noise in the interline regions compared to GNOSIS is a factor of similar to 9 with the GNOSIS gratings and a factor of similar to 17 with the new gratings. PRAXIS will enable the full exploitation of OH suppression for the first time, which was not achieved by GNOSIS (a retrofit to an existing instrument that was not OH-Suppression optimised) due to high thermal emission, low spectrograph transmission and detector noise. PRAXIS has extremely low thermal emission, through the cooling of all significantly emitting parts, including the fore-optics, the fibre Bragg gratings, a long length of fibre, and the fibre slit, and an optical design that minimises leaks of thermal emission from outside the spectrograph. PRAXIS has low detector noise through the use of a Hawaii-2RG detector, and a high throughput through a efficient VPH based spectrograph. PRAXIS will determine the absolute level of the interline continuum and enable observations of individual objects via an IFU. In this paper we give a status update and report on acceptance tests.…
MetadatenAuthor details: | S. C. Ellis, S. Bauer, C. Bacigalupo, J. Bland-Hawthorn, J. J. Bryant, S. Case, R. Content, T. Fechner, D. Giannone, R. Haynes, E. Hernandez, A. J. Horton, U. Klauser, J. S. Lawrence, S. G. Leon-Saval, E. Lindley, Hans-Gerd LöhmannsröbenORCiDGND, S. -S. Min, N. Pai, M. Roth, K. Shortridge, L. Waller, Pascal Xavier, Ross Zhelem |
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DOI: | https://doi.org/10.1117/12.2311898 |
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ISBN: | 978-1-5106-1958-6 |
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ISSN: | 0277-786X |
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ISSN: | 1996-756X |
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Title of parent work (English): | Ground-based and Airborne Instrumentation for Astronomy VII |
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Publisher: | SPIE-INT Soc Optical Engineering |
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Place of publishing: | Bellingham |
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Publication type: | Other |
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Language: | English |
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Date of first publication: | 2018/07/06 |
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Publication year: | 2018 |
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Release date: | 2022/03/10 |
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Tag: | Near infrared; OH suppression; astrophotonics; fibre Bragg gratings; spectroscopy |
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Volume: | 10702 |
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Number of pages: | 16 |
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Funding institution: | ARC LIEF grantAustralian Research Council; German Federal Ministry of Education and Research (BMBF, Centre for Innovation Competence innoFSPEC Potsdam); Ministry for Science, Research and Culture of the State of Brandenburg (MWFK, Higher Education Investment Program); ARC Australian Laureate FellowshipAustralian Research Council; AAO |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
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