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Proceedings Paper

Green astro-comb for HARPS-N
Author(s): Chih-Hao Li; Alexander G. Glenday; David F. Phillips; Gabor Furesz; Nicholas Langellier; Matthew Webber; Alexander Zibrov; Andrew J. Benedick; Guoqing Chang; Li-Jin Chen; Dimitar Sasselov; Franz Kärtner; Andrew Szentgyorgyi; Ronald L. Walsworth
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Paper Abstract

Searches for Earth-like exoplanets using the stellar radial velocity measurements require accuracy <10 cm/s over years. To achieve such high accuracy requires a wavelength reference that provides many calibration lines with fractional frequency accuracy of 10-10 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.

Paper Details

Date Published: 24 September 2012
PDF: 7 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84468X (24 September 2012); doi: 10.1117/12.925799
Show Author Affiliations
Chih-Hao Li, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Alexander G. Glenday, Harvard-Smithsonian Ctr. for Astrophysics (United States)
David F. Phillips, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Gabor Furesz, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Nicholas Langellier, Harvard Univ. (United States)
Matthew Webber, Northeastern Univ. (United States)
Alexander Zibrov, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Andrew J. Benedick, Massachusetts Institute of Technology (United States)
Guoqing Chang, Massachusetts Institute of Technology (United States)
Li-Jin Chen, Massachusetts Institute of Technology (United States)
Dimitar Sasselov, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Franz Kärtner, Massachusetts Institute of Technology (United States)
Andrew Szentgyorgyi, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Ronald L. Walsworth, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Harvard Univ. (United States)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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