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Proceedings Paper

Optical design of imaging and spectrograph for 4m telescope in China
Author(s): Hangxin Ji; Yongtian Zhu; Zhongwen Hu; Yi Chen; Lei Wang; Mingming Xu; Songxin Dai; Huatao Zhang
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Paper Abstract

The design and performance of a three-channel image and long-slit spectrograph for the new 4-m telescope in China are described. The direct imaging covers a 3 arcmin by 3 arcmin field of view and a large wavelength range 370-1,600 nm, it has two optical channels and one near infrared channel with different filters. The spectrograph with a long slit is to provide two observing modes including the following spectral resolutions: R1000 and R5000. For dispersing optical elements it use volume-phased holographic grisms (VPHG) at each of the spectroscopic modes to simplify the camera system. The low resolution mode (R1000) is provided by consecutive observations with the spectral ranges: 360-860 nm, however it adopts only one VPHG for the first light. The spectral range of medium resolution mode (R5000) is 460- 750nm, it is constrained with the use of a 4k × 4k CCD detector of 15 μm pixel size. Peak efficient in the spectrograph are achieved to be higher than 50% in different resolution mode.

Paper Details

Date Published: 6 July 2018
PDF: 13 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070224 (6 July 2018); doi: 10.1117/12.2309911
Show Author Affiliations
Hangxin Ji, Nanjing Institute of Astronomical Optics & Technology (China)
Yongtian Zhu, Nanjing Institute of Astronomical Optics & Technology (China)
Zhongwen Hu, Nanjing Institute of Astronomical Optics & Technology (China)
Yi Chen, Nanjing Institute of Astronomical Optics & Technology (China)
Lei Wang, Nanjing Institute of Astronomical Optics & Technology (China)
Mingming Xu, Nanjing Institute of Astronomical Optics & Technology (China)
Songxin Dai, Nanjing Institute of Astronomical Optics & Technology (China)
Huatao Zhang, Nanjing Institute of Astronomical Optics & Technology (China)


Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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