Acta Optica Sinica, Volume. 36, Issue 6, 614001(2016)
Astronomical Laser Frequency Comb for High Resolution Spectrograph of a 2.16-m Telescope
An astronomical laser frequency comb (astro-comb), which will be applied as a calibrator on the high resolution spectrograph of the 2.16-m telescope in Xinglong Observatory, is introduced. The astro-comb is based on an ytterbium-doped fiber laser frequency comb. By mode filtering, the mode spacing of the comb is increased to 25 GHz, which matches the resolution of the astronomical spectrograph. After spectral broadening and flattening, the spectrum span increases to more than 270 nm in visible range, the spectrum flatness maintains within 1 dB for a long time, and the side mode suppression ratio reaches 42 dB. The theoretical calibration precision of the radial velocity for the astro-comb reaches cm/s level, which meets the requirements for searching the earth-like extrasolar planets and directly detecting the acceleration of the cosmic expansion.
Get Citation
Copy Citation Text
Wu Yuanjie, Ye Huiqi, Han Jian, Zou Pu, Fu Lingtong, Xiao Dong. Astronomical Laser Frequency Comb for High Resolution Spectrograph of a 2.16-m Telescope[J]. Acta Optica Sinica, 2016, 36(6): 614001
Category: Lasers and Laser Optics
Received: Jan. 8, 2016
Accepted: --
Published Online: Jun. 6, 2016
The Author Email: Yuanjie Wu (yjwu@niaot.ac.cn)