Development of a calibrator based on Fabry-Pérot etalon for high resolution spectrograph

The fiber-fed High Resolution Spectrograph of the Chinese Xinglong 2.16-m Telescope is the main instrument for high precision spectral detection in China. In order to improve the observation performance, a wavelength calibrator based on Fabry-P´erot etalon (FPE) is developed. Here, we report on the design, transmission charac-teristics and vacuum-thermostatic performance of the system. To meet the requirements of the calibration, the calibrator is custom-designed with the FPE gap of 5 mm, fineness value of 40, and illuminating fiber of 100 μm in diameter, which could generate calibration lines with 30 GHz in lines space and covering 500 – 700 nm.