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Searches for extrasolar planets using the periodic Doppler shift of stellarspectral lines have recently achieved a precision of 60 cm/s (ref 1), which issufficient to find a 5-Earth-mass planet in a Mercury-like orbit around aSun-like star. To find a 1-Earth-mass planet in an Earthlike orbit, a precisionof 5 cm/s is necessary. The combination of a laser frequency comb with aFabry-Perot filtering cavity has been suggested as a promising approach toachieve such Doppler shift resolution via improved spectrograph wavelengthcalibration, with recent encouraging results. Here we report the fabrication ofsuch a filtered laser comb with up to 40- GHz (1-A) line spacing, generatedfrom a 1- GHz repetition-rate source, without compromising long-term stability,reproducibility or spectral resolution. This wide-line-spacing comb, or`astro-comb', is well matched to the resolving power of high-resolutionastrophysical spectrographs. The astro-comb should allow a precision as high as1 cm/s in astronomical radial velocity measurements.

A laser frequency comb that enables radial velocity measurements with a precision of 1 cm s$^{-1}$