Acta Optica Sinica, Volume. 42, Issue 1, 0112002(2022)
Improvement of Wavelength Calibration Accuracy of Astronomical High-Resolution Spectrometers with Fabry-Perot Etalons
Due to the wide wavelength coverage and dense transmission peak sequence of its spectrum, the Fabry-Perot etalon (FPE) for wavelength calibration of astronomical high-resolution spectra is expected to achieve higher calibration accuracy than traditional calibration sources. However, the unknown wavelengths of FPE transmission peaks pose a challenge for calibration. In this study, without precision measurement devices (such as Fourier transform spectrometers), the thorium-argon (ThAr) lamp, a conventional calibration source equipped on astronomical high-resolution spectrometers, was used to provide the FPE with wavelengths. Then, the errors in the ThAr wavelengths were corrected by using the dense transmission peak sequence of the FPE and the smooth relationship between the penetration depth of the dielectric reflective coating and the wavelength. Accurate wavelengths of the FPE transmission peaks were thus obtained, and wavelength calibration was performed. The calibration test on the fiber-fed high-resolution spectrometer of the Xinglong 2.16-m telescope showed that the wavelength calibration accuracy of the FPE reached 0.053 pm, which was significantly higher than that (0.290 pm) in the case of the ThAr being used alone.
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Zhibo Hao, Huiqi Ye, Liang Tang, Jun Hao, Jian Han, Yang Zhai, Dong Xiao. Improvement of Wavelength Calibration Accuracy of Astronomical High-Resolution Spectrometers with Fabry-Perot Etalons[J]. Acta Optica Sinica, 2022, 42(1): 0112002
Category: Instrumentation, Measurement and Metrology
Received: Jun. 21, 2021
Accepted: Jul. 19, 2021
Published Online: Jan. 17, 2022
The Author Email: Ye Huiqi (hqye@niaot.ac.cn)