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
- Acta Optica Sinica
- Vol. 42, Issue 1, 0112002 (2022)
Fig. 1. Experimental setup for calibration tests
Fig. 2. Diagram of 2D spectra acquired by HRS. (a) ThAr; (b) FPE
Fig. 3. Flow chart describing the principle of wavelength calibration by FPE
Fig. 4. Refractive index of HPFS 7980 fused silica varying with the wavelength
Fig. 5. Optical path compensation function fitting, which is derived from the measured 2D spectra of FPE and ThAr shown in Fig. 2 . (a) Data and the fitted curve. The arrow and the big point show an example of the wavelength of an FPE transmission peak is corrected; (b) residuals in fitting
Fig. 6. Residuals between the wavelength of spectral lines and the wavelength calculated by wavelength solutions, which are derived from the measured 2D spectra of FPE and ThAr shown in Fig. 2 . (a) Residuals for spectral lines with different wavelength; (b) histogram showing the distribution of residuals
Fig. 7. Residuals between the locked wavelength of LFC spectral lines and the wavelength calculated by wavelength solutions, which are derived from the measured 2D spectra of FPE and ThAr shown in Fig. 2
Fig. 8. Optical path compensation functions for different (m0,d0) degenerate solutions
Fig. 9. FPE wavelength solution for S-2 minus that for S0 and FPE wavelength solution for S+2 minus that for S0
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Table 1. Part of (m0,d0) degenerate solutions
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