Design of the near infrared camera DIRAC for East Anatolia Observatory

Ross Zhelem; Robert Content; Vladimir Churilov; Yevgen Kripak; Lew Waller; Scott Case; Slavko Mali; Rolf Muller; Mario Gonzalez; Dave Adams; Nick Binos; Timothy Chin; Tony Farrell; Urs Klauser; Yuriy Kondrat; Nirmala Kunwar; Jon Lawrence; Nuria Lorente; Summer Luo; Erica McDonald; Helen McGregor; Vijay Nichani; Naveen Pai; Minh Vuong; Jahanzeb Zahoor; Jessica Zheng; Barnaby Norris; Julia Bryant; Annino Vaccarella; Nick Herrald; James Gilbert; Cahit Yesilyaprak; Bulent Gucsav; Deniz Coker; Onur Keskin; Laurent Jolissaint

doi:10.1117/12.2629716

Design of the near infrared camera DIRAC for East Anatolia Observatory

Ross Zhelem^*, Robert Content, Vladimir Churilov, Yevgen Kripak, Lew Waller, Scott Case, Slavko Mali, Rolf Muller, Mario Gonzalez, Dave Adams, Nick Binos, Timothy Chin, Tony Farrell, Urs Klauser, Yuriy Kondrat, Nirmala Kunwar, Jon Lawrence, Nuria Lorente, Summer Luo, Erica McDonaldHelen McGregor, Vijay Nichani, Naveen Pai, Minh Vuong, Jahanzeb Zahoor, Jessica Zheng, Barnaby Norris, Julia Bryant, Annino Vaccarella, Nick Herrald, James Gilbert, Cahit Yesilyaprak, Bulent Gucsav, Deniz Coker, Onur Keskin, Laurent Jolissaint

^*Corresponding author for this work

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

4 Citations (Scopus)

Abstract

The 4m DAG telescope is under construction at East Anatolia Observatory in Turkey. DIRAC, the " DAG InfraRed Adaptive optics Camera", is one of the facility instruments. This paper describes the design of the camera to meet the performance specifications. Adaptive and auxiliary optics relay the telescope F/14 input 1:1 into DIRAC. The camera has an all refractive design for the wavelength range 0.9 - 2.4 micron. Lenses reimage the telescope focal plane 33 x 33 as (9 x 9 mm) on a 1k x 1k focal plane array. With magnification of 2x, the plate scale on the detector is 33 mas/pixel. There are 4 standard filters (Y, J, H, K) and 4 narrowband continuum filters. A 12 position filter wheel allows installation of 2 extra customer filters for specific needs; the filter wheel also deploys a pupil viewer lens. Optical tolerancing is carried out to deliver the required image quality at polychromatic Strehl ratio of 90% with focus compensator. This reveals some challenges in the precision assembly of optics for cryogenic environments. We require cells capable of maintaining precision alignment and keeping lenses stress free. The goal is achieved by a combination of flexures with special bonding epoxy matching closely the CTE of the lens cells and crystalline materials. The camera design is very compact with object to image distance

Original language	English
Title of host publication	Ground-based and Airborne Instrumentation for Astronomy IX
Editors	Christopher J. Evans, Julia J. Bryant, Kentaro Motohara
Place of Publication	Washington, DC
Publisher	SPIE
Pages	1-12
Number of pages	12
ISBN (Electronic)	9781510653504
ISBN (Print)	9781510653498
DOIs	https://doi.org/10.1117/12.2629716
Publication status	Published - 2022
Event	Conference on Ground-based and Airborne Instrumentation for Astronomy IX - Montreal, Canada Duration: 17 Jul 2022 → 22 Jul 2022

Publication series

Name	Proceedings of SPIE
Publisher	SPIE
Volume	12184
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Conference on Ground-based and Airborne Instrumentation for Astronomy IX
Country/Territory	Canada
City	Montreal
Period	17/07/22 → 22/07/22

Keywords

infrared
camera
diffraction limited
cryogenic
wavefront budget
cryostat

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10.1117/12.2629716

Cite this

Zhelem, R., Content, R., Churilov, V., Kripak, Y., Waller, L., Case, S., Mali, S., Muller, R., Gonzalez, M., Adams, D., Binos, N., Chin, T., Farrell, T., Klauser, U., Kondrat, Y., Kunwar, N., Lawrence, J., Lorente, N., Luo, S., ... Jolissaint, L. (2022). Design of the near infrared camera DIRAC for East Anatolia Observatory. In C. J. Evans, J. J. Bryant, & K. Motohara (Eds.), Ground-based and Airborne Instrumentation for Astronomy IX (pp. 1-12). Article 1218440 (Proceedings of SPIE; Vol. 12184). SPIE. https://doi.org/10.1117/12.2629716

@inproceedings{6cf0a5994ac040f5a6c4c54efecb04a3,

title = "Design of the near infrared camera DIRAC for East Anatolia Observatory",

abstract = "The 4m DAG telescope is under construction at East Anatolia Observatory in Turkey. DIRAC, the {"} DAG InfraRed Adaptive optics Camera{"}, is one of the facility instruments. This paper describes the design of the camera to meet the performance specifications. Adaptive and auxiliary optics relay the telescope F/14 input 1:1 into DIRAC. The camera has an all refractive design for the wavelength range 0.9 - 2.4 micron. Lenses reimage the telescope focal plane 33 x 33 as (9 x 9 mm) on a 1k x 1k focal plane array. With magnification of 2x, the plate scale on the detector is 33 mas/pixel. There are 4 standard filters (Y, J, H, K) and 4 narrowband continuum filters. A 12 position filter wheel allows installation of 2 extra customer filters for specific needs; the filter wheel also deploys a pupil viewer lens. Optical tolerancing is carried out to deliver the required image quality at polychromatic Strehl ratio of 90% with focus compensator. This reveals some challenges in the precision assembly of optics for cryogenic environments. We require cells capable of maintaining precision alignment and keeping lenses stress free. The goal is achieved by a combination of flexures with special bonding epoxy matching closely the CTE of the lens cells and crystalline materials. The camera design is very compact with object to image distance",

keywords = "infrared, camera, diffraction limited, cryogenic, wavefront budget, cryostat",

author = "Ross Zhelem and Robert Content and Vladimir Churilov and Yevgen Kripak and Lew Waller and Scott Case and Slavko Mali and Rolf Muller and Mario Gonzalez and Dave Adams and Nick Binos and Timothy Chin and Tony Farrell and Urs Klauser and Yuriy Kondrat and Nirmala Kunwar and Jon Lawrence and Nuria Lorente and Summer Luo and Erica McDonald and Helen McGregor and Vijay Nichani and Naveen Pai and Minh Vuong and Jahanzeb Zahoor and Jessica Zheng and Barnaby Norris and Julia Bryant and Annino Vaccarella and Nick Herrald and James Gilbert and Cahit Yesilyaprak and Bulent Gucsav and Deniz Coker and Onur Keskin and Laurent Jolissaint",

year = "2022",

doi = "10.1117/12.2629716",

language = "English",

isbn = "9781510653498",

series = "Proceedings of SPIE",

publisher = "SPIE",

pages = "1--12",

editor = "Evans, {Christopher J.} and Bryant, {Julia J.} and Kentaro Motohara",

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

address = "United States",

note = "Conference on Ground-based and Airborne Instrumentation for Astronomy IX ; Conference date: 17-07-2022 Through 22-07-2022",

}

Zhelem, R, Content, R, Churilov, V, Kripak, Y, Waller, L, Case, S, Mali, S, Muller, R, Gonzalez, M, Adams, D, Binos, N, Chin, T, Farrell, T, Klauser, U, Kondrat, Y, Kunwar, N , Lawrence, J , Lorente, N, Luo, S, McDonald, E, McGregor, H, Nichani, V, Pai, N, Vuong, M, Zahoor, J, Zheng, J, Norris, B, Bryant, J, Vaccarella, A, Herrald, N, Gilbert, J, Yesilyaprak, C, Gucsav, B, Coker, D, Keskin, O & Jolissaint, L 2022, Design of the near infrared camera DIRAC for East Anatolia Observatory. in CJ Evans, JJ Bryant & K Motohara (eds), Ground-based and Airborne Instrumentation for Astronomy IX., 1218440, Proceedings of SPIE, vol. 12184, SPIE, Washington, DC, pp. 1-12, Conference on Ground-based and Airborne Instrumentation for Astronomy IX, Montreal, Canada, 17/07/22. https://doi.org/10.1117/12.2629716

Design of the near infrared camera DIRAC for East Anatolia Observatory. / Zhelem, Ross; Content, Robert; Churilov, Vladimir et al.
Ground-based and Airborne Instrumentation for Astronomy IX. ed. / Christopher J. Evans; Julia J. Bryant; Kentaro Motohara. Washington, DC: SPIE, 2022. p. 1-12 1218440 (Proceedings of SPIE; Vol. 12184).

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

TY - GEN

T1 - Design of the near infrared camera DIRAC for East Anatolia Observatory

AU - Zhelem, Ross

AU - Content, Robert

AU - Churilov, Vladimir

AU - Kripak, Yevgen

AU - Waller, Lew

AU - Case, Scott

AU - Mali, Slavko

AU - Muller, Rolf

AU - Gonzalez, Mario

AU - Adams, Dave

AU - Binos, Nick

AU - Chin, Timothy

AU - Farrell, Tony

AU - Klauser, Urs

AU - Kondrat, Yuriy

AU - Kunwar, Nirmala

AU - Lawrence, Jon

AU - Lorente, Nuria

AU - Luo, Summer

AU - McDonald, Erica

AU - McGregor, Helen

AU - Nichani, Vijay

AU - Pai, Naveen

AU - Vuong, Minh

AU - Zahoor, Jahanzeb

AU - Zheng, Jessica

AU - Norris, Barnaby

AU - Bryant, Julia

AU - Vaccarella, Annino

AU - Herrald, Nick

AU - Gilbert, James

AU - Yesilyaprak, Cahit

AU - Gucsav, Bulent

AU - Coker, Deniz

AU - Keskin, Onur

AU - Jolissaint, Laurent

PY - 2022

Y1 - 2022

N2 - The 4m DAG telescope is under construction at East Anatolia Observatory in Turkey. DIRAC, the " DAG InfraRed Adaptive optics Camera", is one of the facility instruments. This paper describes the design of the camera to meet the performance specifications. Adaptive and auxiliary optics relay the telescope F/14 input 1:1 into DIRAC. The camera has an all refractive design for the wavelength range 0.9 - 2.4 micron. Lenses reimage the telescope focal plane 33 x 33 as (9 x 9 mm) on a 1k x 1k focal plane array. With magnification of 2x, the plate scale on the detector is 33 mas/pixel. There are 4 standard filters (Y, J, H, K) and 4 narrowband continuum filters. A 12 position filter wheel allows installation of 2 extra customer filters for specific needs; the filter wheel also deploys a pupil viewer lens. Optical tolerancing is carried out to deliver the required image quality at polychromatic Strehl ratio of 90% with focus compensator. This reveals some challenges in the precision assembly of optics for cryogenic environments. We require cells capable of maintaining precision alignment and keeping lenses stress free. The goal is achieved by a combination of flexures with special bonding epoxy matching closely the CTE of the lens cells and crystalline materials. The camera design is very compact with object to image distance

AB - The 4m DAG telescope is under construction at East Anatolia Observatory in Turkey. DIRAC, the " DAG InfraRed Adaptive optics Camera", is one of the facility instruments. This paper describes the design of the camera to meet the performance specifications. Adaptive and auxiliary optics relay the telescope F/14 input 1:1 into DIRAC. The camera has an all refractive design for the wavelength range 0.9 - 2.4 micron. Lenses reimage the telescope focal plane 33 x 33 as (9 x 9 mm) on a 1k x 1k focal plane array. With magnification of 2x, the plate scale on the detector is 33 mas/pixel. There are 4 standard filters (Y, J, H, K) and 4 narrowband continuum filters. A 12 position filter wheel allows installation of 2 extra customer filters for specific needs; the filter wheel also deploys a pupil viewer lens. Optical tolerancing is carried out to deliver the required image quality at polychromatic Strehl ratio of 90% with focus compensator. This reveals some challenges in the precision assembly of optics for cryogenic environments. We require cells capable of maintaining precision alignment and keeping lenses stress free. The goal is achieved by a combination of flexures with special bonding epoxy matching closely the CTE of the lens cells and crystalline materials. The camera design is very compact with object to image distance

KW - infrared

KW - camera

KW - diffraction limited

KW - cryogenic

KW - wavefront budget

KW - cryostat

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U2 - 10.1117/12.2629716

DO - 10.1117/12.2629716

M3 - Conference proceeding contribution

SN - 9781510653498

T3 - Proceedings of SPIE

SP - 1

EP - 12

BT - Ground-based and Airborne Instrumentation for Astronomy IX

A2 - Evans, Christopher J.

A2 - Bryant, Julia J.

A2 - Motohara, Kentaro

PB - SPIE

CY - Washington, DC

T2 - Conference on Ground-based and Airborne Instrumentation for Astronomy IX

Y2 - 17 July 2022 through 22 July 2022

ER -

Design of the near infrared camera DIRAC for East Anatolia Observatory

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