Green astro-comb for HARPS-N

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

doi:10.1117/12.925799

24 September 2012 Green astro-comb for HARPS-N

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

Author Affiliations +

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 84468X (2012) https://doi.org/10.1117/12.925799
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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.

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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, and Ronald L. Walsworth "Green astro-comb for HARPS-N", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84468X (24 September 2012); https://doi.org/10.1117/12.925799

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