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  • Astro-comb: revolutionizing precision spectroscopy in astrophysics

  • Claire E. Cramer, Chih-Hao Li, Andrew J. Benedick, Alexander G. Glenday, Franz X. Kärtner, David F. Phillips, Dimitar Sasselov, Andrew Szentgyorgyi, Ronald L. Walsworth
  • Journal:
    Proceedings of the International Astronomical Union / Volume 4 / Issue S253 / May 2008
    Published online by Cambridge University Press:
    01 May 2008, pp. 499-501
    Print publication:
    May 2008
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  • Searches for extrasolar planets using the periodic Doppler shift of stellar spectral lines have recently achieved a precision better than 60cm/s. To find a 1-Earth mass planet in an Earth-like orbit, a precision of 5cm/s is necessary. The combination of a laser frequency comb with a Fabry-Perot filtering cavity has been suggested as a promising approach to achieve such Doppler shift resolution via improved spectrograph wavelength calibration. Here we report the fabrication of such a filtered laser comb with up to 40 GHz (~1 Angstrom) line spacing, generated from a 1 GHz repetition-rate source, without compromising long-term stability, reproducibility or spectral resolution. This wide-line-spacing comb (astro-comb) is well matched to the resolving power of high-resolution astrophysical spectrographs. The astrocomb should allow a precision as high as 1cm/s in astronomical readial velocity measurements.