Improving the spectral uniformity of calibration sources for astronomical spectrographs by spectrum shaping

Hua Zhen; Huiqi Ye; Fujia Du; Tongjun Liu; Chaojun Zhou; Dong Xiao

doi:10.1117/12.3048077

13 December 2024 Improving the spectral uniformity of calibration sources for astronomical spectrographs by spectrum shaping

Hua Zhen, Huiqi Ye, Fujia Du, Tongjun Liu, Chaojun Zhou, Dong Xiao

Author Affiliations +

Proceedings Volume 13494, AOPC 2024: Optical Spectroscopy and Applications; 134940B (2024) https://doi.org/10.1117/12.3048077
Event: Applied Optics and Photonics China 2024 (AOPC2024), 2024, Beijing, China

Abstract

Calibration system is crucial for high-resolution spectrographs which are used in astronomical observation. The main scientific objective of Canary Hybrid Optical High-Resolution Ultra-Stable Spectrograph (CHORUS), under development by NIAOT, is to detect Earth-like exoplanets. The expected radial velocity (RV) precision of CHORUS is 10cm/s. Therefore, the required calibration precision is less than 10cm/s. However, the spectral intensity distributions of commonly used calibration sources vary greatly with wavelength, which reduces the signal-to-noise ratio (SNR) of calibration data. Moreover, the spectrograph detector may be saturated at some wavelengths while lacking sufficient SNR at other wavelengths. Hence, we propose a novel spectrum shaping method to improve the spectral uniformity of calibration sources and enhance the calibration precision of astronomical spectrographs. We built an experimental system based on a digital micromirror device (DMD) to demonstrate the spectral flattening of a supercontinuum source. The experimental results show that the spectral flatness is less than 0.5dB within the 585nm to738nm range.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Hua Zhen, Huiqi Ye, Fujia Du, Tongjun Liu, Chaojun Zhou, and Dong Xiao "Improving the spectral uniformity of calibration sources for astronomical spectrographs by spectrum shaping", Proc. SPIE 13494, AOPC 2024: Optical Spectroscopy and Applications, 134940B (13 December 2024); https://doi.org/10.1117/12.3048077

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KEYWORDS

Calibration

Digital micromirror devices

Astronomy

Spectrographs

Diffraction gratings

Control systems

Diffraction

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