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18 November 2014 Design on a dual band high spectral resolution imaging solar spectrometer
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The multi-wave imaging spectrometer with high spectral resolution and high energy utilization is an essential tool to characterize the solar atmosphere. A novel method based on the aberrations correction and high grating efficiency is proposed to avoid the aberration and increase the temporal resolution. It is applied to design a dual band high spectral resolution imaging spectrometer based on New Vacuum Solar Telescope, it can simultaneously observe Hα 0.6563 um and CaII 0.8542 um lines, separately, improving the telescope observation efficiency. The ray tracing and optimization for the optical system are carried out with Zemax software. The results demonstrate that the wavefront RMS is roughly 0.06λ at 0.6563 um, and 0.04λ at 0.8542 um, within 3 arcmins field of view; The grating efficiency are all better than 70% in the range from 0.6 um to 1.1 um, which are equivalent to that of the fast imaging spectrograph (43%) installed in the New solar telescope at Big Bear Solar Observatory. The method is proved to be feasible, and can be used as a guidance to spectrometer design.
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Lianhui Zheng, Naiting Gu, Changhui Rao, and Qi Qiu "Design on a dual band high spectral resolution imaging solar spectrometer", Proc. SPIE 9298, International Symposium on Optoelectronic Technology and Application 2014: Imaging Spectroscopy; and Telescopes and Large Optics, 92980T (18 November 2014);


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