Acta Optica Sinica, Volume. 39, Issue 3, 0330003(2019)
Optical System Design of High Throughput Multi-Channel Spectrograph for Very Large Telescope
An analysis model based on boundary limits for multi-channel spectrograph with the broad band and high throughput is built. The relationships among performance requirements, initial parameters, project budget, and risk of the multi-channel spectrograph are discussed. The mathematic model can get structural parameters of each sub-system of the multi-channel spectrograph quickly according to the given system requirements. It also provide a valuable method to evaluate the feasibility of the design and cost budget reasonably at the beginning of the project. A multi-channel spectrograph based on volume phase holographic gratings is designed for the 4 m telescope. It has a wavelength range from 350 nm to 1000 nm and resolution of 5000 at the blazed wavelength in each channel. The peak efficiency of the whole spectrograph is over 53%, and the monochromatic enclosed energy at 80% is better than 15 μm with the whole working band, which meets the requirements of system performance.
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Hangxin Ji, Yongtian Zhu, Zhongwen Hu. Optical System Design of High Throughput Multi-Channel Spectrograph for Very Large Telescope[J]. Acta Optica Sinica, 2019, 39(3): 0330003
Category: Spectroscopy
Received: Oct. 8, 2018
Accepted: Nov. 19, 2018
Published Online: May. 10, 2019
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