TY  - JOUR
AU  - Glenday, Alexander G.
AU  - Li, Chih-Hao
AU  - Langellier, Nicholas
AU  - Chang, Guoqing
AU  - Chen, Li-Jin
AU  - Furesz, Gabor
AU  - Zibrov, Alexander A.
AU  - Kaertner, Franz
AU  - Phillips, David F.
AU  - Sasselov, Dimitar
AU  - Szentgyorgyi, Andrew
AU  - Walsworth, Ronald L.
TI  - Operation of a Broadband Visible-Wavelength Astro-Comb with a High-Resolution Astrophysical Spectrograph
JO  - Optica
VL  - 2
IS  - 3
SN  - 2334-2536
CY  - Washington, DC
PB  - OSA
M1  - PUBDB-2015-01536
SP  - 250 - 254
PY  - 2015
AB  - Searches for Earth-like exoplanets using the periodic Doppler shift of stellar absorption lines require 10 cm∕s precision in the measurement of stellar radial velocity (RV) over timescales of years. Current techniques have led to the discovery of short-period exoplanets that induce RV wobbles as small as ≈1 m∕s on their parent stars. It has been suggested that order-of-magnitude improved RV precision may be achievable using an astro-comb, a laser frequency comb optimized for astrophysical spectrograph wavelength calibration. Here we report the development of a broadband visible-wavelength astro-comb and its operation with the HARPS-N spectrograph at the Telescopio Nazionale Galileo in the Canary Islands. This green astrocomb has >7000 narrow (<1 MHz) spectral lines spaced by 16 GHz with relatively uniform line power from 500 to 620 nm. The line frequencies are locked to GPS, enabling us to realize HARPS-N wavelength calibration with RV measurement precision and stability <10 cm∕s.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000354867000010
DO  - DOI:10.1364/OPTICA.2.000250
UR  - https://bib-pubdb1.desy.de/record/208059
ER  -