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介绍了应用于我国兴隆观测站2.16m望远镜高分辨率光谱仪的天文光学频率梳。采用掺镱光纤激光频率梳作为源光梳,通过模式滤波使模式间隔达到25GHz,与天文光谱仪的分辨率相匹配。光谱展宽和平滑后,光谱覆盖可见光范围达到270nm以上,光谱平滑度可长期保持在1dB范围内,边模抑制比达到42dB。该天文光学频率梳的视向速度理论定标精度可达cm/s量级,使寻找系外类地行星乃至直接测量宇宙膨胀速度成为可能。
The astronomical optical frequency comb applied to the 2.16m telescope high resolution spectrometer in Xinglong station of our country is introduced. The ytterbium-doped fiber laser frequency comb is used as the source optical comb, and the mode spacing is up to 25 GHz by mode filtering to match the resolution of the astronomical spectrometer. After spectral broadening and smoothing, the spectral coverage of the visible light reaches more than 270nm, the spectral smoothness can be kept within 1dB for a long time, and the side mode suppression ratio reaches 42dB. The astronomical optical frequency comb theory of directional velocity calibration accuracy up to cm / s order of magnitude, so that looking for extrasolar planets and even directly measure the expansion rate of the universe possible.