PRAXIS: an OH suppression optimised near infrared spectrograph

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; H. G. Löhmannsröben; S. S. Min; N. Pai; M. Roth; K. Shortridge; L. Waller; Pascal Xavier; Ross Zhelem

doi:10.1117/12.2311898

PRAXIS: an OH suppression optimised near infrared spectrograph

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, H. G. Löhmannsröben, S. S. Min, N. Pai, M. RothK. Shortridge, L. Waller, Pascal Xavier, Ross Zhelem

^*Corresponding author for this work

Australian Astronomical Optics

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

12 Citations (Scopus)

Abstract

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 ∼ 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 (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.

Original language	English
Title of host publication	Ground-based and Airborne Instrumentation for Astronomy VII
Editors	Christopher J. Evans, Luc Simard, Hideki Takami
Place of Publication	Bellingham, Washington
Publisher	SPIE
Pages	1-16
Number of pages	16
ISBN (Electronic)	9781510619586
ISBN (Print)	9781510619579
DOIs	https://doi.org/10.1117/12.2311898
Publication status	Published - 6 Jul 2018
Event	Ground-based and Airborne Instrumentation for Astronomy VII 2018 - Austin, United States Duration: 10 Jun 2018 → 14 Jun 2018

Publication series

Name	Proceedings of SPIE
Volume	10702
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Ground-based and Airborne Instrumentation for Astronomy VII 2018
Country/Territory	United States
City	Austin
Period	10/06/18 → 14/06/18

Keywords

astrophotonics
fibre Bragg gratings
Near infrared
OH suppression
spectroscopy

Access to Document

10.1117/12.2311898

Cite this

Ellis, S. C., Bauer, S., Bacigalupo, C., Bland-Hawthorn, J., Bryant, J. 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., ... Zhelem, R. (2018). PRAXIS: an OH suppression optimised near infrared spectrograph. In C. J. Evans, L. Simard, & H. Takami (Eds.), Ground-based and Airborne Instrumentation for Astronomy VII (pp. 1-16). Article 107020P (Proceedings of SPIE; Vol. 10702). SPIE. https://doi.org/10.1117/12.2311898

@inproceedings{48168e9be72e429dbb95bfcdfaa80828,

title = "PRAXIS: an OH suppression optimised near infrared spectrograph",

abstract = "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 ∼ 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 (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.",

keywords = "astrophotonics, fibre Bragg gratings, Near infrared, OH suppression, spectroscopy",

author = "Ellis, {S. C.} and S. Bauer and C. Bacigalupo and J. Bland-Hawthorn and Bryant, {J. J.} and S. Case and R. Content and T. Fechner and D. Giannone and R. Haynes and E. Hernandez and Horton, {A. J.} and U. Klauser and Lawrence, {J. S.} and Leon-Saval, {S. G.} and E. Lindley and L{\"o}hmannsr{\"o}ben, {H. G.} and Min, {S. S.} and N. Pai and M. Roth and K. Shortridge and L. Waller and Pascal Xavier and Ross Zhelem",

year = "2018",

month = jul,

day = "6",

doi = "10.1117/12.2311898",

language = "English",

isbn = "9781510619579",

series = "Proceedings of SPIE",

publisher = "SPIE",

pages = "1--16",

editor = "Evans, {Christopher J.} and Luc Simard and Hideki Takami",

booktitle = "Ground-based and Airborne Instrumentation for Astronomy VII",

address = "United States",

note = "Ground-based and Airborne Instrumentation for Astronomy VII 2018 ; Conference date: 10-06-2018 Through 14-06-2018",

}

Ellis, SC, Bauer, S, Bacigalupo, C, Bland-Hawthorn, J, Bryant, JJ, 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, Waller, L, Xavier, P & Zhelem, R 2018, PRAXIS: an OH suppression optimised near infrared spectrograph. in CJ Evans, L Simard & H Takami (eds), Ground-based and Airborne Instrumentation for Astronomy VII., 107020P, Proceedings of SPIE, vol. 10702, SPIE, Bellingham, Washington, pp. 1-16, Ground-based and Airborne Instrumentation for Astronomy VII 2018, Austin, United States, 10/06/18. https://doi.org/10.1117/12.2311898

PRAXIS: an OH suppression optimised near infrared spectrograph. / Ellis, S. C.; Bauer, S.; Bacigalupo, C. et al.
Ground-based and Airborne Instrumentation for Astronomy VII. ed. / Christopher J. Evans; Luc Simard; Hideki Takami. Bellingham, Washington: SPIE, 2018. p. 1-16 107020P (Proceedings of SPIE; Vol. 10702).

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

TY - GEN

T1 - PRAXIS

T2 - Ground-based and Airborne Instrumentation for Astronomy VII 2018

AU - Ellis, S. C.

AU - Bauer, S.

AU - Bacigalupo, C.

AU - Bland-Hawthorn, J.

AU - Bryant, J. J.

AU - Case, S.

AU - Content, R.

AU - Fechner, T.

AU - Giannone, D.

AU - Haynes, R.

AU - Hernandez, E.

AU - Horton, A. J.

AU - Klauser, U.

AU - Lawrence, J. S.

AU - Leon-Saval, S. G.

AU - Lindley, E.

AU - Löhmannsröben, H. G.

AU - Min, S. S.

AU - Pai, N.

AU - Roth, M.

AU - Shortridge, K.

AU - Waller, L.

AU - Xavier, Pascal

AU - Zhelem, Ross

PY - 2018/7/6

Y1 - 2018/7/6

N2 - 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 ∼ 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 (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.

AB - 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 ∼ 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 (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.

KW - astrophotonics

KW - fibre Bragg gratings

KW - Near infrared

KW - OH suppression

KW - spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=85052658108&partnerID=8YFLogxK

U2 - 10.1117/12.2311898

DO - 10.1117/12.2311898

M3 - Conference proceeding contribution

AN - SCOPUS:85052658108

SN - 9781510619579

T3 - Proceedings of SPIE

SP - 1

EP - 16

BT - Ground-based and Airborne Instrumentation for Astronomy VII

A2 - Evans, Christopher J.

A2 - Simard, Luc

A2 - Takami, Hideki

PB - SPIE

CY - Bellingham, Washington

Y2 - 10 June 2018 through 14 June 2018

ER -

PRAXIS: an OH suppression optimised near infrared spectrograph

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