Demonstration of on-sky calibration of astronomical spectra using a 25 GHz near-IR laser frequency comb

Gabriel G. Ycas, Franklyn Quinlan, Scott A. Diddams, Steve Osterman, Suvrath Mahadevan, Stephen Redman, Ryan Terrien, Lawrence Ramsey, Chad F. Bender, Brandon Botzer, Steinn Sigurdsson

Research output: Contribution to journalArticlepeer-review

122 Scopus citations

Abstract

We describe and characterize a 25 GHz laser frequency comb based on a cavity-filtered erbium fiber mode-locked laser. The comb provides a uniform array of optical frequencies spanning 1450 nm to 1700 nm, and is stabilized by use of a global positioning system referenced atomic clock. This comb was deployed at the 9.2 m Hobby-Eberly telescope at the McDonald Observatory where it was used as a radial velocity calibration source for the fiber-fed Pathfinder near-infrared spectrograph. Stellar targets were observed in three echelle orders over four nights, and radial velocity precision of ∼10 m/s (∼6 MHz) was achieved from the comb-calibrated spectra.

Original languageEnglish (US)
Pages (from-to)6631-6643
Number of pages13
JournalOptics Express
Volume20
Issue number6
DOIs
StatePublished - Mar 12 2012

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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