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6 July 2018 Optical design of imaging and spectrograph for 4m telescope in China
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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.
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Hangxin Ji, Yongtian Zhu, Zhongwen Hu, Yi Chen, Lei Wang, Mingming Xu, Songxin Dai, and Huatao Zhang "Optical design of imaging and spectrograph for 4m telescope in China", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070224 (6 July 2018);

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