Li, Chih-Hao, Glenday, Alexander G., Phillips, David F., Furesz, Gabor, Langellier, Nicholas, Webber, Matthew, Zibrov, Alexander, Benedick, Andrew J., Chang, Guoqing, Chen, Li-Jin, Sasselov, Dimitar, Kärtner, Franz, Szentgyorgyi, Andrew H., and Walsworth, Ronald L. 2012. "Green astro-comb for HARPS-N." Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series 8446:https://doi.org/10.1117/12.925799
Searches for Earth-like exoplanets using the stellar radial velocity measurements require accuracy -10 in the visible spectral range. We have developed a green astro-comb that generates ~6000 lines equally spaced by ~0.15 Å over 1000-Å bandwidth (centered at 5500 Å). The frequency of each line is directly locked to a frequency standard with fractional accuracy of 10-12 over decades. We plan to bring this green astro-comb to the HARPS-north spectrograph at the TNG telescope for tests in 2012.