Astro-Comb Revolutionizing Precision Spectroscopy in Astrophysics

Details Astro-Comb Revolutionizing Precision Spectroscopy in Astrophysics Astro-Comb Revolutionizing Precision Spectroscopy in Astrophysics

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009fsm..conf..166c&link_type=abstract

FREQUENCY STANDARDS AND METROLOGY. Proceedings of the 7th Symposium. Held 5-11 October 2008 in Asilomar Conference Grounds, Paci

Mathematics

Logic

Laser Frequency Combs, Radial Velocity Measurements, Spectrograph Calibration

Scientific paper

Precision Doppler spectroscopy in astrophysics is limited by the stability of calibration sources, as well as the number, width and distribution of available calibration lines. Broadband frequency combs generated from mode-locked femtosecond lasers have revolutionized precision laboratory spectroscopy. We present a laser comb with up to 40 GHz line-spacing, generated from a 1 GHz repetition-rate "source comb" and a Fabry-Perot filtering cavity. The line spacing can be optimized for use with any high-resolution astronomical spectrograph. Our prototype, which we have recently tested with the Tillinghast Reflector Echelle Spectrograph on Mt. Hopkins, provides a 100-nm band of calibration light centered on 850 nm, in the center of the a region difficult to calibrate with atomic sources. The astro-comb should allow more than an order-of-magnitude improvement in sensitivity to changes in Doppler-shifts and cosmological redshifts, with significant impact on many fields, including stellar seismology, cosmology, and the search for extrasolar earths.

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