Journal Article

PUBDB-2015-01536

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Operation of a Broadband Visible-Wavelength Astro-Comb with a High-Resolution Astrophysical Spectrograph

Glenday, A. G. (Corresponding Author) ; Li, C.-H. ; Langellier, N. ; Chang, G.CFEL*DESY* ; Chen, L.-J. ; Furesz, G. ; Zibrov, A. A. ; Kaertner, F.CFEL*DESY* ; Phillips, D. F. ; Sasselov, D. ; Szentgyorgyi, A. ; Walsworth, R. L.

2015
OSA Washington, DC

This record in other databases:      

Please use a persistent id in citations: doi:10.1364/OPTICA.2.000250

Abstract: 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.

---

Contributing Institute(s):

1. Ultrafast Lasers & X-rays Division (FS-CFEL-2)

Research Program(s):

1. 6211 - Extreme States of Matter: From Cold Ions to Hot Plasmas (POF3-621) (POF3-621)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2015

---