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Design study of an image slicer module for a multiobject spectrograph

Ozaki, Shinobu and Tsuzuki, Toshihiro and Obuchi, Yoshiyuki and Ikenoue, Bungo and Miyazaki, Satoshi and Fucik, Jason R. and Bundy, Kevin A. and Savage, Maureen (2019) Design study of an image slicer module for a multiobject spectrograph. Journal of Astronomical Telescopes, Instruments, and Systems, 5 (3). Art. No. 035001. ISSN 2329-4124. http://resolver.caltech.edu/CaltechAUTHORS:20190822-114532644

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Abstract

We investigate an image slicer module for an optical multiobject spectrograph, wide-field optical spectrograph (WFOS), which is one of the first-light instruments of the Thirty Meter Telescope (TMT). The image slicer divides the target image into three slices, thus providing a one-third narrower slit width. By positioning a suite of such modules at the telescope focal surface, multiobject spectroscopy with high spectral resolution can be achieved. Three optical designs are developed: a two-mirror design, a four-mirror design, and a flat-mirror design. Comparing them, the flat-mirror design is found to be the most preferable for WFOS. From a tolerance analysis, the tolerances of manufacturing and assembling appear challenging but not insurmountable. We describe how the steep field curvature of TMT requires at least nine module variants, tuned to reduce defocus in specific focal surface zones. Finally, we introduce a viable mechanical packaging concept.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/1.jatis.5.3.035001DOIArticle
ORCID:
AuthorORCID
Ozaki, Shinobu0000-0002-5443-0300
Tsuzuki, Toshihiro0000-0002-8342-8314
Obuchi, Yoshiyuki0000-0003-0234-7174
Bundy, Kevin A.0000-0001-9742-3138
Additional Information:© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE). Paper 19010 received Jan. 18, 2019; accepted for publication May 8, 2019; published online Jun. 6, 2019. The authors would like to thank Bernard Delabre for providing the original idea of the flat-mirror design. We also appreciate the in-depth discussions with Noboru Ebizuka about dispersers. The TMT Project gratefully acknowledges the support of the TMT collaborating institutions. They are the California Institute of Technology, the University of California, the National Astronomical Observatory of Japan, the National Astronomical Observatories of China and their consortium partners, the Department of Science and Technology of India and their supported institutes, and the National Research Council of Canada. This work was supported as well by the Gordon and Betty Moore Foundation, the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the Natural Sciences and Engineering Research Council of Canada, the British Columbia Knowledge Development Fund, the Association of Canadian Universities for Research in Astronomy (ACURA), the Association of Universities for Research in Astronomy (AURA), the U.S. National Science Foundation, the National Institutes of Natural Sciences of Japan, and the Department of Atomic Energy of India.
Group:Thirty Meter Telescope
Funders:
Funding AgencyGrant Number
Thirty Meter Telescope ProjectUNSPECIFIED
CaltechUNSPECIFIED
University of CaliforniaUNSPECIFIED
National Astronomical Observatory of JapanUNSPECIFIED
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)UNSPECIFIED
Department of Science and Technology (India)UNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
British Columbia Knowledge Development FundUNSPECIFIED
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
NSFUNSPECIFIED
National Institutes of Natural Sciences of JapanUNSPECIFIED
Department of Atomic Energy (India)UNSPECIFIED
Subject Keywords:image slicer; multiobject spectroscopy; wide field optical spectrograph; thirty meter telescope
Issue or Number:3
Record Number:CaltechAUTHORS:20190822-114532644
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190822-114532644
Official Citation:Shinobu Ozaki, Toshihiro Tsuzuki, Yoshiyuki Obuchi, Bungo Ikenoue, Satoshi Miyazaki, Jason R. Fucik, Kevin A. Bundy, Maureen Savage, "Design study of an image slicer module for a multiobject spectrograph," J. Astron. Telesc. Instrum. Syst. 5(3) 035001 (6 June 2019) https://doi.org/10.1117/1.JATIS.5.3.035001
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98110
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:22 Aug 2019 20:18
Last Modified:22 Aug 2019 20:18

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