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Measuring part-per-billion line shifts and frequencies with direct-frequency-comb Vernier spectroscopy

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Abstract

Accurate frequency measurements of CO2 transitions around 2 µm are performed by direct frequency-comb Vernier spectroscopy. Measurements of pressure line shifts at the ppb. accuracy level demonstrates the application of comb sources in precision molecular spectroscopy.

© 2015 Optical Society of America

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