| DOI | Resolve DOI: https://doi.org/10.1117/12.2560324 |
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| Author | Search for: Motohara, Kentaro; Search for: Minowa, Yusuke; Search for: Tanaka, Ichi; Search for: Hattori, Takashi; Search for: Koyama, Yusei; Search for: Konishi, Masahiro; Search for: Yanagisawa, Kenshi; Search for: Iwata, Ikuru; Search for: Wang, Shiang-Yu; Search for: Chou, Richard C. Y.; Search for: Kimura, Masahiko; Search for: Pazder, John1 |
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| Affiliation | - National Research Council of Canada. Herzberg Astronomy and Astrophysics
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| Format | Text, Article |
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| Conference | Ground-based and Airborne Instrumentation for Astronomy VIII, December 14-18, 2020, Online Only, United States |
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| Physical description | 10 p. |
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| Subject | imaging systems; optical filters; sensors; telescopesv; adaptive optics; astronomical imaging; deformable mirrors; mirrors; spectrographs; turbulence |
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| Abstract | Results of a conceptual design study of ULTAIMTE-Wide Field Imager (WFI) is presented. ULTIMATE-WFI is a near-infrared wide-field imager for the ground-layer adaptive optics system of the Subaru telescope (ULTIMATESubaru) which realizes a 0. 002 seeing size over 200diameter at the Cassegrain focus utilizing a deformable 2ndry mirror. WFI has a 15. 07×15. 07 FoV with a wavelength coverage of 0.9–2.5µm. The FoV is covered by four identical optics, each having a square field lens with 226mm on a side. Its effective FoV is 7. 02 on a side, and is covered by a HAWAII-4RG array detector with a pixel scale of 0. 0011/pix. Effective FoV will be 14. 04×14. 04 or 2070 in total. Spot sizes at a detector plane are less than 0. 001 over the wavelength coverage. Due to the large FoV, vignetting by the telescope structure occurs and an additional cold stop is necessary to block their thermal emission, which causes ~80% vignetting at the edge of the FoV. All the optics are contained in a cylindrical structure to be installed on the Cassegrain focus of the telescope, and kept under cryogenic temperature except for the field lenses. Gravitational deformation will be smaller than 1mm, and may have negligible impact on the final image quality. |
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| Publication date | 2020-12-13 |
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| Publisher | SPIE |
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| In | |
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| Series | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | d22fff71-b89e-4175-a64a-a7e693093ea6 |
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| Record created | 2022-07-20 |
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| Record modified | 2022-07-20 |
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