Abstract

We report precision measurements of the refractive indices of dry air, N2, O2, Ar, and CO2, performed by using a frequency comb as the light source in a Mach–Zehnder interferometer setup. Improved dispersion formulas for all gases are derived with a sensitivity level of 109. These results are valid for a wavelength range from 740 to 860nm and are in good agreement with measurements from other groups.

© 2008 Optical Society of America

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