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.
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| 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 | ||||||||||||||||||||||||||||||||||||
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| 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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