PRAXIS: a near infrared spectrograph optimised for OH suppression

S. C. Ellis, S. Bauer, J. Bland-Hawthorn, 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, H. G. Löhmannsröben, S. S. Min, N. Pai, M. Roth, K. Shortridge, Nicholas F. Staszak & 3 others Julia Tims, Pascal Xavier, Ross Zhelem

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

Abstract

Atmospheric emission from OH molecules is a long standing problem for near-infrared astronomy. PRAXIS is a unique spectrograph, currently in the build-phase, which is fed by a fibre array that removes the OH background. The OH suppression is achieved with fibre Bragg gratings, which were tested successfully on the GNOSIS instrument. PRAXIS will use the same fibre Bragg gratings as GNOSIS in the first implementation, and new, less expensive and more efficient, multicore fibre Bragg gratings in the second implementation. The OH lines are suppressed by a factor of ∼1000, and the expected increase in the signal-to-noise in the interline regions compared to GNOSIS is a factor of ∼ 9 with the GNOSIS gratings and a factor of ∼ 17 with the new gratings. PRAXIS will enable the full exploitation of OH suppression for the first time, which was not achieved by GNOSIS due to high thermal emission, low spectrograph transmission, and detector noise. PRAXIS will have 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 a fibre slit, and an optical design that minimises leaks of thermal emission from outside the spectrograph. PRAXIS will achieve low detector noise through the use of a Hawaii-2RG detector, and a high throughput through an efficient VPH based spectrograph. The scientific aims of the instrument are to determine the absolute level of the interline continuum and to enable observations of individual objects via an IFU. PRAXIS will first be installed on the AAT, then later on an 8m class telescope.

LanguageEnglish
Title of host publicationProceedings of SPIE
Subtitle of host publicationGround-Based and Airborne Instrumentation for Astronomy VI
EditorsChristopher J. Evans, Luc Simard, Hideki Takami
Place of PublicationBellingham, Washington
PublisherSPIE
Pages1-13
Number of pages13
ISBN (Electronic)9781510601963
ISBN (Print)9781510601956
DOIs
Publication statusPublished - 2016
Externally publishedYes
EventGround-Based and Airborne Instrumentation for Astronomy VI - Edinburgh, United Kingdom
Duration: 26 Jun 201630 Jun 2016

Publication series

NameProceedings of SPIE
Volume9908
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherGround-Based and Airborne Instrumentation for Astronomy VI
CountryUnited Kingdom
CityEdinburgh
Period26/06/1630/06/16

Fingerprint

Infrared spectrographs
Spectrographs
Spectrograph
Fiber Grating
Fiber Bragg gratings
Bragg Grating
spectrographs
Infrared
retarding
fibers
Detector
Fiber
Bragg gratings
Detectors
Gratings
thermal emission
Fibers
Infrared Astronomy
Optical design
Astronomy

Keywords

  • near infrared
  • spectroscopy
  • OH suppression
  • astrophotonics
  • Fibre Bragg Gratings

Cite this

Ellis, S. C., Bauer, S., Bland-Hawthorn, J., Case, S., Content, R., Fechner, T., ... Zhelem, R. (2016). PRAXIS: a near infrared spectrograph optimised for OH suppression. In C. J. Evans, L. Simard, & H. Takami (Eds.), Proceedings of SPIE: Ground-Based and Airborne Instrumentation for Astronomy VI (pp. 1-13). [99084A] (Proceedings of SPIE; Vol. 9908). Bellingham, Washington: SPIE. https://doi.org/10.1117/12.2232115
Ellis, S. C. ; Bauer, S. ; Bland-Hawthorn, J. ; Case, S. ; Content, R. ; Fechner, T. ; Giannone, D. ; Haynes, R. ; Hernandez, E. ; Horton, A. J. ; Klauser, U. ; Lawrence, J. S. ; Leon-Saval, S. G. ; Lindley, E. ; Löhmannsröben, H. G. ; Min, S. S. ; Pai, N. ; Roth, M. ; Shortridge, K. ; Staszak, Nicholas F. ; Tims, Julia ; Xavier, Pascal ; Zhelem, Ross. / PRAXIS : a near infrared spectrograph optimised for OH suppression. Proceedings of SPIE: Ground-Based and Airborne Instrumentation for Astronomy VI. editor / Christopher J. Evans ; Luc Simard ; Hideki Takami. Bellingham, Washington : SPIE, 2016. pp. 1-13 (Proceedings of SPIE).
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abstract = "Atmospheric emission from OH molecules is a long standing problem for near-infrared astronomy. PRAXIS is a unique spectrograph, currently in the build-phase, which is fed by a fibre array that removes the OH background. The OH suppression is achieved with fibre Bragg gratings, which were tested successfully on the GNOSIS instrument. PRAXIS will use the same fibre Bragg gratings as GNOSIS in the first implementation, and new, less expensive and more efficient, multicore fibre Bragg gratings in the second implementation. The OH lines are suppressed by a factor of ∼1000, and the expected increase in the signal-to-noise in the interline regions compared to GNOSIS is a factor of ∼ 9 with the GNOSIS gratings and a factor of ∼ 17 with the new gratings. PRAXIS will enable the full exploitation of OH suppression for the first time, which was not achieved by GNOSIS due to high thermal emission, low spectrograph transmission, and detector noise. PRAXIS will have 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 a fibre slit, and an optical design that minimises leaks of thermal emission from outside the spectrograph. PRAXIS will achieve low detector noise through the use of a Hawaii-2RG detector, and a high throughput through an efficient VPH based spectrograph. The scientific aims of the instrument are to determine the absolute level of the interline continuum and to enable observations of individual objects via an IFU. PRAXIS will first be installed on the AAT, then later on an 8m class telescope.",
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Ellis, SC, Bauer, S, Bland-Hawthorn, J, Case, S, Content, R, Fechner, T, Giannone, D, Haynes, R, Hernandez, E, Horton, AJ, Klauser, U, Lawrence, JS, Leon-Saval, SG, Lindley, E, Löhmannsröben, HG, Min, SS, Pai, N, Roth, M, Shortridge, K, Staszak, NF, Tims, J, Xavier, P & Zhelem, R 2016, PRAXIS: a near infrared spectrograph optimised for OH suppression. in CJ Evans, L Simard & H Takami (eds), Proceedings of SPIE: Ground-Based and Airborne Instrumentation for Astronomy VI., 99084A, Proceedings of SPIE, vol. 9908, SPIE, Bellingham, Washington, pp. 1-13, Ground-Based and Airborne Instrumentation for Astronomy VI, Edinburgh, United Kingdom, 26/06/16. https://doi.org/10.1117/12.2232115

PRAXIS : a near infrared spectrograph optimised for OH suppression. / Ellis, S. C.; Bauer, S.; Bland-Hawthorn, J.; Case, S.; Content, R.; Fechner, T.; Giannone, D.; Haynes, R.; Hernandez, E.; Horton, A. J.; Klauser, U.; Lawrence, J. S.; Leon-Saval, S. G.; Lindley, E.; Löhmannsröben, H. G.; Min, S. S.; Pai, N.; Roth, M.; Shortridge, K.; Staszak, Nicholas F.; Tims, Julia; Xavier, Pascal; Zhelem, Ross.

Proceedings of SPIE: Ground-Based and Airborne Instrumentation for Astronomy VI. ed. / Christopher J. Evans; Luc Simard; Hideki Takami. Bellingham, Washington : SPIE, 2016. p. 1-13 99084A (Proceedings of SPIE; Vol. 9908).

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

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AU - Staszak,Nicholas F.

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N2 - Atmospheric emission from OH molecules is a long standing problem for near-infrared astronomy. PRAXIS is a unique spectrograph, currently in the build-phase, which is fed by a fibre array that removes the OH background. The OH suppression is achieved with fibre Bragg gratings, which were tested successfully on the GNOSIS instrument. PRAXIS will use the same fibre Bragg gratings as GNOSIS in the first implementation, and new, less expensive and more efficient, multicore fibre Bragg gratings in the second implementation. The OH lines are suppressed by a factor of ∼1000, and the expected increase in the signal-to-noise in the interline regions compared to GNOSIS is a factor of ∼ 9 with the GNOSIS gratings and a factor of ∼ 17 with the new gratings. PRAXIS will enable the full exploitation of OH suppression for the first time, which was not achieved by GNOSIS due to high thermal emission, low spectrograph transmission, and detector noise. PRAXIS will have 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 a fibre slit, and an optical design that minimises leaks of thermal emission from outside the spectrograph. PRAXIS will achieve low detector noise through the use of a Hawaii-2RG detector, and a high throughput through an efficient VPH based spectrograph. The scientific aims of the instrument are to determine the absolute level of the interline continuum and to enable observations of individual objects via an IFU. PRAXIS will first be installed on the AAT, then later on an 8m class telescope.

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Ellis SC, Bauer S, Bland-Hawthorn J, Case S, Content R, Fechner T et al. PRAXIS: a near infrared spectrograph optimised for OH suppression. In Evans CJ, Simard L, Takami H, editors, Proceedings of SPIE: Ground-Based and Airborne Instrumentation for Astronomy VI. Bellingham, Washington: SPIE. 2016. p. 1-13. 99084A. (Proceedings of SPIE). https://doi.org/10.1117/12.2232115