Demonstration of on-sky calibration of astronomical spectra using a 25 GHz near-IR laser frequency comb
2012; Optica Publishing Group; Volume: 20; Issue: 6 Linguagem: Inglês
10.1364/oe.20.006631
ISSN1094-4087
AutoresGabriel Ycas, Franklyn Quinlan, Scott A. Diddams, Steve Osterman, Suvrath Mahadevan, Stephen L. Redman, Ryan C. Terrien, Lawrence W. Ramsey, Chad F. Bender, B. Botzer, Steinn Sigurđsson,
Tópico(s)Photonic Crystal and Fiber Optics
ResumoWe 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 \sim10 m/s (\sim6 MHz) was achieved from the comb-calibrated spectra.
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